In a titration, a molar mass lower than the actual one could be obtained by spilling part of the acid before titration or recording a dark red color instead of a light pink as the endpoint. These errors would lower the calculated molar mass because either too little acid or too much NaOH is assumed for the reaction.
Explanation:In a titration experiment with a carboxylic acid and a standardized NaOH solution, there are factors that could lead to the measurement of a molar mass that is smaller than its actual value.
Error I: If some of the carboxylic acid is spilled when being transferred into the titration flask, this will decrease the amount of acid available for titration. This leads to an underestimation of the amount of NaOH needed for neutralization and therefore a smaller calculation for molar mass.
Error II: If the endpoint of the titration is recorded when the color is dark red rather than light pink, this means that the end-point has been overshot – too much NaOH has been added. This excess amount would lead to the calculation of a smaller molar mass since an increased volume of NaOH is wrongly assumed to have neutralized the acid.
Titration analysis therefore requires real accuracy both in process and observation to avoid such errors. It is important to determine and record the right endpoint based on a distinct, recognized color change with the suitable indicator, in this case, a change from colorless to light pink with phenolphthalein.
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The correct answer is that both errors I and II will lead to a molar mass that is smaller than the actual molar mass.
I. Some of the acid is spilled when being transferred into the titration flask.
When some of the acid is spilled, the mass of the acid that is actually titrated is less than the mass that was intended to be titrated.
Since molar mass is calculated by dividing the mass of the substance by the number of moles of that substance, a smaller mass will result in a smaller calculated molar mass if the number of moles is not adjusted accordingly.
The molar mass (M) is given by:
[tex]\[ M = \frac{m}{n} \][/tex]
where m is the mass of the acid and n is the number of moles of the acid.
If the mass m is smaller due to spillage, and n remains the same (because the titre does not change), then the calculated molar mass M will be smaller.
II. The endpoint is recorded when the solution is dark red in color rather than light pink.
Phenolphthalein is a common acid-base indicator that is colorless in acidic solutions and pink in basic solutions.
The endpoint of the titration is reached when the solution changes from colorless to light pink, indicating that the acid has been neutralized by the NaOH.
If the endpoint is recorded when the solution is dark red, it means that the titration has continued past the true endpoint, adding excess NaOH.
This excess NaOH will not react with the acid (since it's already been neutralized), but it will be included in the calculation of the moles of NaOH used.
The number of moles of acid [tex](\( n_{acid} \))[/tex] is calculated using the moles of NaOH [tex](\( n_{NaOH} \))[/tex] used to reach the endpoint:
[tex]\[ n_{acid} = n_{NaOH} \][/tex]
If [tex]\( n_{NaOH} \)[/tex] is overestimated due to continuing the titration past the endpoint, then [tex]\( n_{acid} \)[/tex] will also be overestimated. Since the mass of the acid m remains unchanged, the calculated molar mass M will be smaller:
[tex]\[ M = \frac{m}{n_{acid}} \][/tex]
In conclusion, both spilling some of the acid and recording the endpoint too late will result in a calculated molar mass that is smaller than the actual molar mass of the carboxylic acid.
Kevin has 5 fish in his fish tank jasmine has 4 times as many fish as Kevin.How many fish does jasmine have?
What is the total magnification with two lenses when one lens has a magnification or 15, and the other lens has a magnification of 30?
One of a kind static electricity is a result of electrons moving into an object from another object. What is another way static electricity can build up in an object?
Another way static electricity can build up in an object is induction. Induction is the transfer of electrons from one part of an object to another part, caused by the electric field of another object, without the two objects touching.
PLEASE HELP ASAP!!THANKS!
Balance the following and label what type of reaction is taking place:
C5H9O + O2? CO2 + H2O
Balanced chemical reaction:
4C₅H₉O + 27O₂ → 20CO₂ + 18H₂O.
According to principle of mass conservation, number of atoms must be equal on both side of chemical reaction.
Type of reaction is combustion.
Combustion is reaction with oxygen.
Organic compound reacts with oxygen and produce carbon dioxide and water.
Which electrons in a calcium atom in the ground state have the greatest effect on the chemical properties of calcium
Answer is: the two electrons in the fourth shell.
Atomic number of calcium is 20, it means that it has 20 protons and 20 electrons, so atom of calcium is neutral.
Electron configuration of calcium atom: ₂₀Ca 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²; calcium has two valence electrons (4s²).
In reactions it lose those two electrons ang form cation with positive charge 2+.
Atomic number is the number of protons, which is characteristic of a chemical element.
Beryllium, magnesium,calcium and strontium are alkaline earth metals. The elements have very similar properties.
Alkaline earth metals have in common an outer s- electron shell (two electrons).
Help me number 16 and 17
16) Chemical equation: Ca + H₃PO₄ → Ca₃(PO₄)₂ + H₂.
Oxidation reaction: Ca⁰ → Ca⁺² + 2e⁻ /×3.
3Ca⁰ → 3Ca⁺² + 6e⁻
Reduction reaction: 6e⁻ + 2H₃⁺¹ → 3H₂⁰.
Calcium change oxidation number from 0 to +2 (oxidation) and hydrogen change oxidation number from +1 to 0 (reduction).
Balanced chemical equation: 3Ca + 2H₃PO₄ → Ca₃(PO₄)₂ + 3H₂.
Calcium is stronger reducing agent than hydrogen, gives electrons easier.
This is example of single displacement reaction.
Single displacement is reaction where neutral element metal or nonmetal become an ion as it replaces another ion in a compound.
17) Balanced chemical equation:
3Ca(s) + 2H₃PO₄(aq) → Ca₃(PO₄)₂(aq) + 3H₂(g).
Ionic equation: 3Ca + 6H⁺ + 2PO₄³⁻ → 3Ca²⁺ + 2PO₄³⁻ + 3H₂.
Net ionic equation: 3Ca + 6H⁺ → 3Ca²⁺ + 3H₂.
A spectator ion is an ion that exists as a reactant and a product in a chemical equation.
A spectator ion is phospate anion PO₄³⁻.
calculate the enthalpy change when 4.00 mol Cl2O7 is produced according to the following balanced equation:
2Cl2(g) + 7O2(g) + 130kcal -> 2Cl2O7(g)
a. 1040 kcal
b. -260 kcal
c. 260 kcal
d. -1040 kcal
** if you could explain it as well, that would be much appreciated !! if not, thats okay too its multiple choice
So the equation is,
2Cl2(g) + 7O2(g) + 130kcal -> 2Cl2O7(g)
from this , ΔH°rxn=[tex]130kcal.mol^{-1}[/tex]
[tex]mol^{-1}[/tex] is mentioned because it is for per mole of reaction. So for 4. moles of the product [tex]2Cl_{2} O_{7}[/tex] we need 4/2 moles of reaction to be used to calculate associated enthalphy change for the reaction.
Therefore[tex]4/2*130=260 kcal[/tex]
The tropopause is best described as which of the following?
The lowest layer of Earth's atmosphere is called troposphere.The layer immediately next to troposphere is called Stratosphere. The boundary layer between troposphere and stratosphere is described as tropopause.
The tropopause is the transition layer between the troposphere and the stratosphere in Earth's atmosphere. It is located at an altitude of about 12-15 km, and it is the coldest part of the atmosphere.
Explanation:The tropopause can be defined as the transition layer between the troposphere and the stratosphere in Earth's atmosphere. It is located at an altitude of about 12-15 km (7-8 miles), and it is the coldest part of the atmosphere. The temperature in the troposphere decreases steadily with increasing altitude, but at the tropopause, the temperature starts warming again due to the absorption of UV radiation by ozone in the stratosphere.
The element bromine, Br, has a larger atomic radius than A) Cu, O and Ba B) I, Cu, and Ba C) F and Kr D) O, F, and Kr
The answer is: D) O, F, and Kr.
Atomic radius of bromine (Br) is 114 pm.
Atomic radius of oxygen (O) is 73 pm.
Atomic radius of fluorine (F) is 72 pm.
Atomic radius of krypron (Kr) is 112 pm.
The atomic radius of a chemical element is a measure of the size of its atom.
The atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.
The atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.
When the temperature in a room increases from 25c to 33c what changes from a solid to a liquid
Answer:
Gallium
Explanation:
Compare the radio waves broadcasts by the two stations, WIL-92.3 and KSHE-94.7
A. Which station broadcasts waves with more energy?
B. Which station broadcasts waves with a shorter wavelength
C. Which stations broadcasts waves with a higher frequency?
The frequency of radio waves at the two stations are:
1. WIL-92.3 : Frequency = 92.3 MHz (mega hertz)
2. KSHE-94.7 : Frequency = 94.7 MHz
The wavelength (λ) and frequency (ν) are related as:
ν = c/λ ------(1)
Energy (E), frequency (ν) and wavelength (λ) are related as:
E = hν -----(2)
(or)
E = hc/λ ----(3)
A) Based on equation (2), higher the frequency higher is the energy. Therefore, station KSHE broadcasts waves with higher energy
B) Based on equation (1), higher the frequency lower will be the wavelength. Station KSHE will broadcast waves with shorter wavelength
C) KSHE will broadcast waves with higher frequency
Station KSHE-94.7 broadcasts waves with more energy, a shorter wavelength, and a higher frequency compared to WIL-92.3, as higher frequencies correspond to more energy and shorter wavelengths.
Explanation:In comparing radio wave broadcasts of WIL-92.3 and KSHE-94.7, we need to consider frequency, energy, and wavelength properties of radio waves. Here is how they relate:
Higher frequency corresponds to greater energy and shorter wavelength.Lower frequency corresponds to lesser energy and longer wavelength.Given that,:
Station KSHE-94.7 broadcasts waves with more energy, since it operates at a higher frequency (94.7 MHz) compared to WIL-92.3.Station KSHE-94.7 broadcasts waves with a shorter wavelength, as shorter wavelengths are associated with higher frequency transmissions.Station KSHE-94.7 broadcasts waves with a higher frequency, as is evident from their respective frequencies - the higher the frequency, the higher the energy of waves.Therefore, all the three properties are higher for KSHE-94.7 as compared to WIL-92.3.
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How many atoms are in one mole of gold? A) 1.97 x 1023 atoms. B) 6.02 x 1023 atoms C) 79 atoms. D) 197 atoms
B. Is the Answer 6.022 * 1023
Answer: B) [tex]6.022\times10^{23}[/tex] atoms.
Explanation:
According to the International System of units ,
A mole is basically denotes a unit that contains [tex]6.022\times10^{23}[/tex] of atoms.
It is also known as Avagadro Number.
Similarly, the number of atoms in one mole of gold = [tex]6.022\times10^{23}[/tex]
hence, the correct answer is B) [tex]6.022\times10^{23}[/tex] atoms.
A solution is made by dissolving 1.00 moles of sodium chloride (NaCl) in 155 grams of water. If the molal boiling point constant for water (Kb) is 0.51 °C/m, what would be the boiling point of this solution? Show all of the work needed to solve this problem.
Answer:
106.6 °C
Step-by-step explanation:
The formula for boiling point elevation ΔTb is
ΔTb = iKb·b
where
i = the van't Hoff i# factor
Kb = the molal boiling point elevation constant
b = the molal concentration of the solution
=====
Data
i = 2, because 1 mol of NaCl gives 2 mol of ions in solution.
Kb = 0.51 °C·mol·kg⁻¹
b = 1.00/0.155
b = 6.452 mol·kg⁻¹
=====
Calculations
ΔTb = 2 × 0.51 × 6.452
ΔTb = 6.58°C
Tb = Tb° + ΔTb
Tb = 100 + 6.58
Tb = 106.6 °C
PLEASE HELP ASAP!! CHEMISTRY BALANCING EQUATIONS!
How many liters of NH3 at stp will react with 5.3g O2 to form NO2 and water?
4NH3(g) + 7O2(g) -> 4NO2 + 6H2O(g)
A. 0.00423L
B. 2.12L
C.3.03L
D. 6.49L
Answer:
B. 2.12 L
Step-by-step explanation:
We know we will need a balanced chemical equation with masses and molar masses, so, let's gather all the information in one place.
M_r: 32.00
4NH₃(g) + 7O₂(g) ⟶ 4NO₂ + 6H₂O(g)
m/g: 5.3
(a) Moles of O₂
Moles of O₂ = 5.3 × 1/32.00
Moles of O₂ =0.166 mol
=====
(b) Moles of NH₃
The molar ratio is 4 mol NH₃= 7 mol O₂.
Moles of NH₃ = 0.166 × 4/7
Moles of NH₃ = 0.0946 mol NH₃
=====
(c) Volume of NH₃ at STP
STP is 1 bar and 0 °C. At STP, the molar volume of a gas is 22.71 L.
Volume of NH₃ = 0.0946 ×22.71/1
Volume of NH₃ = 2.15 L
=====
It looks as if you are using the old (pre-1982) definition of STP.
Under that definition, the molar volume of a gas at STP was 22.41 L.
The volume of NH₃ is then 2.12 L.
Given that Cu + 2HCI Cu2+ + 2CI- + H2(g) has an overall reduction potential of –0.34 V, what is a valid prediction about how this reaction works? The reaction is not spontaneous and will require energy to proceed. The reverse reaction would require energy input in order to occur. The half reactions would both occur spontaneously. The reaction is not spontaneous, and it is impossible to make it occur.
Cu + 2HCI → Cu²⁺ + 2CI⁻ + H2(g)
has an overall reduction potential of –0.34 V
The correct option is:
The reaction is not spontaneous and will require energy to proceed.
Since the overall reduction potential is negative,the reaction is not spontaneous and it requires energy to proceed.
The reaction is
Cu(s) + 2HCI(aq) ---> Cu⁺² + 2CI⁻ + H₂(g)
The given E⁰cell = -0.34
The overall reduction potential is negative
A reaction is said to be spontaneous it is ΔG° is negative
The relation between ΔG° and Electrode potential is
ΔG° = -nFE°cell
as given that
E°cell = -0.34 V
The overall value of ΔG° will be positive and hence reaction must be non spontaneous
so
The reaction is not spontaneous and will require energy to proceed.
explain how atoms(ions) are held together in an ionic bond. Give an example of an ionic compound
Ionic bond is described as the chemical bond between two oppositely charged ions. In ionic bond the metal loses electron forming a positively charged cation and a non metal which accept the cation to form a negatively charged anion. In ionic bond the atoms are held together by electrostatic force of attraction. In ionic bond the anions and cations are present in the ratio where the total charge of the compound becomes zero. For example, Let us consider NaCl compound. An atom of the sodium has three electrons in its valency shell and the electrons are removed from the outer most shell by applying the energy of 5.14 electron volts. The chlorine atom lacks an electron to attain stable electronic configuration and it accepts the electron from the sodium by releasing 3.62 electron volts of energy which means that it takes only 1.52 electron volts of energy to donate an electron to chlorine when both the atoms are far apart. When these electrons are brought together their electric potential becomes more negative. This means that if the neutral sodium and chlorine atoms are found themselves closer it would be energetically favourable to transfer electrons from sodium to chlorine thus resulting in the formation of the ionic bond.
The ions in an ionic bond are held together by electrostatic attraction between the anions and cations in the compound.
For example, sodium chloride [NaCl] (more commonly known as salt) has positively charged sodium [Na+] ions, or cations, and negatively charged chlorine [Cl-] ions, or anions, holding the compound together.
How many moles of gas are there in a 45.0 L container at 25.0 °C and 500.0 mm Hg?
You can solve this by utilizing the ideal gas law, PV=nRT. P is pressure, V is volume, n is the number of moles, R is a constant (depends on the unit of pressure), and T is the temperature (in Kelvins).
500.0mmHg- convert to atm
=0.65789atm (do sig figs last)
25.0 C- convert to K
25.0 +273= 298K
PV=nRT
0.65789atm times 45.0L equals n (the variable) times R (0.08206L atm mol^-1 K^-1) times 298K
Isolate the variable, n and plug into a calculator.
I hope this helped!
Answer: The moles of gas is 1.21 moles.
Explanation:
To calculate the moles of gas, we use the equation given by ideal gas which follows:
[tex]PV=nRT[/tex]
where,
P = pressure of the gas = 500.0 mmHg
V = Volume of the gas = 45.0 L
T = Temperature of the gas = [tex]25^oC=[25+273]K=298K[/tex]
R = Gas constant = [tex]62.364\text{ L.mmHg }mol^{-1}K^{-1}[/tex]
n = number of moles of gas = ?
Putting values in above equation, we get:
[tex]500.0mmHg\times 45.0L=n\times 62.3637\text{ L.mmHg }mol^{-1}K^{-1}\times 298K\\\\n=\frac{500.0\times 45.0}{62.364\times 298}=1.21mol[/tex]
Hence, the moles of gas is 1.21 moles.
Question 1 (True/False Worth 2 points)
(04.03 LC)
When Pb and AlCl3 react together, lead (Pb) can replace aluminum (Al) in the compound because lead is lower on the activity series.
True
False
Question 2(Multiple Choice Worth 4 points)
(04.03 MC)
Which of the following equations has the correct products and is balanced correctly for a reaction between Na3PO4 and KOH?
Na3PO4 + 3KOH → 3NaOH + K3PO4, because K retains the same charge throughout the reaction
Na3PO4 + KOH → Na3OH + KPO4, because K increases in charge from 1+ to 3+ when it is replaced
Na3PO4 + KOH → 3NaOH + K3PO4, because K retains the same charge throughout the reaction
Na3PO4 + KOH → Na3OH + K3PO4, because K increases in charge from 1+ to 3+ when it is replaced
Question 3(Multiple Choice Worth 4 points)
(04.03 LC)
Which of the following is a single replacement reaction?
Ba(OH)2 + H2SO4 → BaSO4 + 2H2O
2Mg + O2 → 2MgO
H2O+ CO2 → H2CO3
Zn + H2SO4 → ZnSO4 + H2
Question 4(Multiple Choice Worth 4 points)
(04.03 MC)
Sodium metal reacts with water to produce hydrogen gas.
What best describes this reaction?
A single replacement reaction takes place because sodium is less reactive than hydroxide ions.
A double replacement reaction takes place because sodium is less reactive than hydroxide ions.
A double replacement reaction takes place because sodium is more reactive than hydrogen.
A single replacement reaction takes place because sodium is more reactive than hydrogen.
Question 5 (True/False Worth 2 points)
(04.03 LC)
A single replacement reaction is a reaction in which one element replaces a similar element within a compound.
True
False
Question 6(Multiple Choice Worth 4 points)
(04.03 MC)
The table shows the nature of reactants and products formed in a certain type of chemical reaction.
Nature of Reactants and Products
Reactants Products
Metal + Ionic compound Metal + Ionic compound
Which of the following is true about the type of chemical reaction?
It is a single replacement reaction, and the anions in the two ionic compounds are different.
It is a single replacement reaction, and the cations in the two ionic compounds are different.
It is a double replacement reaction, and the anions in the two ionic compounds are different.
It is a double replacement reaction, and the cations in the two ionic compounds are different.
1) Answer is: False.
Balanced chemical reaction: Pb + AlCl₃ → no reaction.
The reactivity series is a series of metals from highest to lowest reactivity. Metal higher in the reactivity series will displace another.
Aluminium (Al) is higher in activity series than lead (Pb).
That means aluminium (Al) is stronger reducing agent than lead and gives electrons easier.
This series are used to summarize information about the reactions of metals with acids or water, double displacement reactions (more reactive metals displace metals with lower reactivity) and the extraction of metals from their ores.
2) Answer is: Na3PO4 + 3KOH → 3NaOH + K3PO4, because K retains the same charge throughout the reaction.
This chemical reaction is double displacement reaction - cations (K⁺ and Na⁺) and anions (PO₄³⁻⁻ and OH⁻) of the two reactants switch places and form two new compounds.
Na₃PO₄ is sodium phosphate.
KOH is potassium hydroxide.
NaOH is sodium hydroxide.
K₃PO₄ is potassium phosphate.
3) Answer is: Zn + H2SO4 → ZnSO4 + H2.
Single replacement is reaction where neutral element metal or nonmetal become an ion as it replaces another ion in a compound.
In this balanced chemical reaction zinc (Zn) replaces hydrogen (H).
Zinc changes oxidation number from 0 to +2 (this is oxidation) and hydrogen change oxidation number from +1 to 0 (reduction).
4) Answer is: A single replacement reaction takes place because sodium is more reactive than hydrogen.
Balanced chemical reaction:
2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g).
Single replacement is reaction where neutral element metal or nonmetal become an ion as it replaces another ion in a compound.
In this balanced chemical reaction sodium (Na) replaces hydrogen (H).
Sodium changes oxidation number from 0 to +1 (oxidation) and hydrogen change oxidation number from +1 to 0 (reduction).
5) Answer is: True.
For example, balanced chemical reaction:
Ca + 2HCl → H₂ + CaCl₂.
Reduction hald reaction: 2H⁺ + 2e⁻→ H₂.
Oxidation half reaction: Ca⁰ → Ca²⁺ + 2e⁻.
In this balanced chemical reaction calcium (Ca) replaces hydrogen (H).
In this chemical reaction, calcium lost two electrons (oxidation, change oxidation number from 0 to +2) and hydrogen gain that two electrons (reduction, change oxidation number from +1 to 0).
6) Answer is: It is a single replacement reaction, and the cations in the two ionic compounds are different.
For example, balanced chemical reaction:
Ba + MgSO₄ → BaSO₄(s) + Mg.
In this balanced chemical reaction barium (Ba) replaces magnesium (Mg), because barium is higher at activity series.
Sulfate anion (SO₄²⁻) is the same in two ionic compounds, but cations (Mg²⁺ and Ba²⁺) changes.
Single Displacement is reaction where neutral element metal or nonmetal become an ion as it replaces another ion in a compound.
Which of these is a renewable resource? A) Gasoline that contains some alcohol B) Wind produced by the uneven heating of Earth's surface C) Natural gas pumped from deep underground D) None of these
Answer is: B) Wind produced by the uneven heating of Earth's surface.
Gasoline is a mixture of many different hydrocarbons: alkanes (paraffins), cycloalkanes and alkenes (olefins). It is not renewable resource, because every year is less and less gasoline.
Natural gas is usualy methane, it is not renewable recourse.
Wind consists of the bulk movement of air.
Final answer:
Wind produced by the uneven heating of Earth's surface is the renewable resource among the options provided.
Explanation:
Among the listed options, the renewable resource is B) Wind produced by the uneven heating of Earth's surface. Renewable energy sources such as wind can be replenished within a human timescale and do not deplete. Gasoline, even if it contains some alcohol, is not renewable because it is derived from petroleum which is a finite resource. Natural gas, while it may be used alongside renewable resources, is also non-renewable as it cannot be replenished within a human timescale once it's extracted from deep underground.
HELP PLS !!! :) Based on valence electron configurations, which of the following is the accurate formula for a compound formed from sodium (Na) and oxygen (O)?(Note: All numerical values below are subscripts) *
Answer: The accurate formula is [tex]Na_2O[/tex].
Explanation: Atomic no of Sodium is 11. The electronic configuration is:
Na: [tex]1s^22s^22p^63s^1[/tex]
Atomic no of Oxygen is 8. The electronic configuration is:
O: [tex]1s^22s^22p^4[/tex]
Thus sodium needs to lose one electron in order to attain noble gas configuration and Oxygen needs to gain two electrons to attain noble gas configuration.
Thus Na will lose one electron to form [tex]Na^+[/tex] and Oxygen gain two electrons to form [tex]O^{2-}[/tex]. In order to form a stable neutral compound, two sodium ions are required.
Thus the formula will be [tex]Na_2O[/tex].
The study of chemicals is called chemistry. There are two types of solution in the chemistry and these are acid and base.
The correct answer is [tex]Na_2O[/tex]
What are moles?
The mole is the base unit of the amount of substance in the International System of Units.It is defined as exactly 6.02214076×10²³ elementary entities, which may be atoms, molecules, ions, or electrons.Thus sodium needs to lose one electron in order to attain noble gas configuration and Oxygen needs to gain two electrons to attain noble gas configuration.
Thus Na will lose one electron to form [tex]Na^+[/tex] and Oxygen gain two electrons to form[tex]O^{-2}[/tex] In order to form a stable neutral compound, two sodium ions are required.
Thus the formula will be [tex]Na_2O[/tex].
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The salts NaCl and CaCl2
(a) are good conductors of electricity
(b) have positive charges
(c) have the same crystal lattice of energy
(d) are held together by ionic bond
Answer: The correct answer is Option a and d.
Explanation: Both the salts are ionic in nature because when dissolved in water, they dissociate into their respective ions.
Ionic compounds are held together by ionic bond. They are neutral compounds as both positive and negative charges neutralize each other. These compounds are also good conductors of electricity because of the presence of ions.
As both the salts have different molecular formula, both of them will have different crystal lattice system and hence, different crystal lattice energy.
From the above information, the correct options are option a and option d.
Answer:
D
Explanation:
both a and b
that i a correct
answer
Which of the following pairs of elements is most likely to form an ionic bond?
A.
carbon and chlorine
B.
phosphorous and bromine
C.
sulfur and oxygen
D.
sodium and sulfur
Answer is: D. sodium and sulfur.
When the electronegativity difference is greater, the bond polarity is increasing..
Electronegativity (χ) is a property that describes the tendency of an atom to attract a shared pair of electrons.
Atoms with higher electronegativity attracts more electrons towards it, electrons are closer to that atom.
Δχ(Na-S) = 2.6 - 0.95 = 1.655; electronegativity difference between sodium and sulfur.
Ionic bond is the electrostatic attraction between oppositely charged ions (cations and anions).
Sodium is metal (forms cation) and sulfur is nonmetal (forms anion).
How many particles are in one mole?
A.
6.022 × 1023
B.
2.066 × 1023
C.
6.023 × 1022
D.
3.026 × 1022
Your answer is A
6.02 × 1023 particles
Answer: [tex]6.022\times 10^{23}[/tex]
Explanation: According to Avogadros law, one mole of any substance contains a fixed number of particles i.e [tex]6.022\times 10^{23}[/tex] particles (atoms, molecules or ions) which is also known by the name Avogadro's number.
For example: 1 mole of [tex]O_2[/tex] molecule contains [tex]6.022\times 10^{23}[/tex] molecules of oxygen.
1 mole of [tex]He[/tex] contains [tex]6.022\times 10^{23}[/tex] atoms of helium.
A 0.1326 g sample of magnesium was burned in an oxygen bomb calorimeter. the total heat capacity of the calorimeter plus water was 5,760 j/°c. if the temperature rise of the calorimeter with water was 0.570°c, calculate the enthalpy of combustion of magnesium. mg(s) + 1/2o2(g) →mgo(s)
The enthalpy of combustion of magnesium in this experiment is approximately -602 kJ/mol, which was determined by dividing the total heat transferred (calculated from the calorimeter's heat capacity and temperature change) by the number of moles of magnesium burnt.
Explanation:
In the experiment described, a small piece of magnesium was burnt in a oxygen bomb calorimeter, leading to a recorded temperature rise in the calorimeter and the water it contains. The enthalpy of combustion of magnesium can be determined from these values by using the equation q = mcΔT, where q is the heat transferred, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature. In this case, the total heat transferred (q) is the heat capacity of the calorimeter and the water times the temperature change, or 5760 J/°C * 0.570 °C = 3283.2 J. The molar enthalpy of combustion can then be calculated by determining the moles of Mg burnt (0.1326 g / 24.305 g/mol = 0.00545 mol) and dividing the heat produced by the moles of Mg burnt (3283.2 J / 0.00545 mol = -602 kJ/mol). Therefore, when rounded to 3 significant figures, the enthalpy of combustion of magnesium is around -602 kJ/mol.
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Which of the following statements about energy in systems is true? Energy can be transferred or transformed inside or outside of a system, but energy cannot be destroyed. The total amount of energy in a system must be equal to the total amount of matter in that system. When energy is transferred or transformed within a system, some matter must be changed into energy so that the total amount of energy remains constant.
According to first law of thermodynamics, energy can neither be formed nor be destroyed but can be converted from one form to another.
thus the statement that Energy can be transferred or transformed inside or outside of a system, but energy cannot be destroyed, is true statment.
Answer:
Energy can be transferred or transformed inside or outside of a system, but energy cannot be destroyed.
Explanation:
A popular principle in science is known as the principle of conservation of energy. It states that energy cannot be created nor destroyed but can be converted from one form to another.
In a system, energy transformations are possible and does happen though inefficiently according to the laws of thermodynamics but energy can never be destroyed following the laws of thermodynamics.
Question 1(Multiple Choice Worth 4 points) (04.05 LC) What is the oxidation number of manganese in MnO41−? +3 +4 +7 +8 Question 2(Multiple Choice Worth 4 points) (04.05 LC) Which of the following reactions could be used to power a battery because of the transfer of electrons? Pb22+ + 2Br− → PbBr CaCl2 + 2NaOH → Ca(OH)2 + 2NaCl KOH + HCl → KCl + H2O Zn + Cu2+ → Zn2+ + Cu Question 3(Multiple Choice Worth 4 points) (04.05 MC) Read the following chemical equation: 2Al + 3Br2 → 2AlBr3 Which statement best identifies and describes the oxidizing agent in the reaction? Al is the oxidizing agent because its oxidation number increases. Al is the oxidizing agent because its oxidation number decreases. Br2 is the oxidizing agent because its oxidation number increases. Br2 is the oxidizing agent because its oxidation number decreases. Question 4(Multiple Choice Worth 4 points) (04.05 MC) In which of the following reactions is chlorine (Cl) oxidized? Br2 + 2Cl− → Cl2 + 2Br− Cl2 + 2e− → 2Cl− 2ClO3− + 12H+ → Cl2 + 6H2O 2Na + Cl2 → 2NaCl Question 5(Multiple Choice Worth 4 points) (04.05 MC) The diagram shows the setup of an experiment. A few observations of the experiment are listed in the table below the diagram. A beaker filled three-fourths with a liquid labeled colorless silver nitrate solution is shown. A small strip is shown inside the beaker. The strip is labeled copper strip. The title of the image is Experimental Setup. Experimental Observations Observation Description 1 Solution turned blue 2 Gray particles were deposited on the edge of the strip Which of the following is the correct explanation for one of the given observations? Observation 2 is a result of nitrate ions moving into the solution. Observation 1 is a result of copper ions moving into the solution. Observation 1 is a result of silver atoms losing one electron. Observation 2 is a result of silver ions losing one electron.
1) Answer is: the oxidation number of manganese in MnO₄⁻ is +7.
Permanganate anion has negative charge 1-.
Oxygen (O) in permanganate anion has oxidation number -2.
x + 4 · (-2) = -1.
x - 8 = -1.
x = +7; oxidation nzmber of manganese.
Oxidation number shows the degree of oxidation of an atom in a chemical compound.
2) Answer is: Zn + Cu2+ → Zn2+ + Cu.
In this chemical reaction, there is transfer of electrons from zinc (Zn) to copper (Cu). Zinc change oxidation number from 0 to +2 (lost electrons) and copper change oxidation number from +2 to 0 (gain electrons).
Oxidation half reaction: Zn⁰ → Zn²⁺ + 2e⁻.
Reduction half reaction: Cu²⁺ + 2e⁻ → Cu⁰.
In other chemical reactions, there is no change of oxidation number of elements.
3) Answer is: Br2 is the oxidizing agent because its oxidation number decreases.
Balanced chemical reaction: 2Al + 3Br₂ → 2AlBr₃.
In this chemical reaction, aluminium change oxidation number from 0 to +3 (lose electrons) and bromine change oxidation number from 0 to -1 (gain electrons, reduced).
Oxidizing agent is a substance that has the ability to oxidize other substances, to cause them to lose electrons.
In oxido-reduction reaction, at least one element lose and one element gain electrons.
4) Answer is: Br2 + 2Cl− → Cl2 + 2Br⁻.
Oxidation is increase of oxidation number.
In this balanced chemical reaction, chlorine change oxidation number from -1 (Cl⁻) to oxidation number 0 (Cl₂).
Oxidation half reaction: 2Cl⁻ → Cl₂⁰ + 2e⁻.
Reduction half reaction: Br₂ + 2e⁻ → 2Br⁻.
In other chemical reactions, chlorine is reduced.
5) Answer is: Observation 1 is a result of copper ions moving into the solution.
The reactivity series is a series of metals from highest to lowest reactivity. Metal higher in the reactivity series will displace another.
Copper (Cu) is higher in activity series than silver (Ag), so copper lose electron and silver gain electrons.
Copper is oxidized (increase of oxidation number) and silver is reduced.
The oxidation number of manganese in MnO4− is +7. A reaction that can power a battery is Zn + Cu2+ → Zn2+ + Cu. Chlorine is oxidized in the reaction 2ClO3− + 12H+ → Cl2 + 6H2O, and observation 1 in an experiment with copper and silver nitrate indicates copper ions moving into the solution.
Explanation:The oxidation number of manganese in MnO4− is +7. In this compound, oxygen has a typical oxidation state of -2, and because the compound has an overall charge of -1, the oxidation number of manganese can be calculated using the equation: Mn + 4(×-2) = -1, which gives Mn a oxidation state of +7.
The reaction that could be used to power a battery is Zn + Cu2+ → Zn2+ + Cu. In this redox reaction, zinc is oxidized, going from Zn to Zn2+, and copper is reduced, going from Cu2+ to Cu, allowing for the transfer of electrons necessary to generate electric current.
The oxidizing agent in the reaction 2Al + 3Br2 → 2AlBr3 is Br2, because it is reduced, with its oxidation number decreasing from 0 in Br2 to -1 in AlBr3.
Chlorine (Cl) is oxidized in the reaction 2ClO3− + 12H+ → Cl2 + 6H2O. Here, the chlorine goes from an oxidation state of +5 in ClO3− to 0 in Cl2.
The correct explanation for one of the observations in the experiment with the silver nitrate solution and the copper strip is that Observation 1 is a result of copper ions moving into the solution. When the copper strip is placed in the silver nitrate solution, it undergoes oxidation, and Cu atoms lose electrons to form Cu2+ ions, which then cause the solution to turn blue.
How many electrons does boron lose when forming a ion?
A. 1
B. 2
C. 3
D. 4
(NOT D)
(Answer) (C) 3
Boron is a non-metal with atomic number 5. The electronic configuration of boron atom is [He]2s^22p^1.
Boron atom has the tendency to obtain stable electronic configuration like its nearest noble gas helium by losing electrons. Boron atom usually loses 3 electrons from its outermost electronic shell to form a cation with +3 charge.
Therefore, boron atom loses 3 electrons while forming an ion.
*I think it’s either the first one or the last one, but I’m just not sure.
Nitrogen dioxide gas is dark brown in color and remains in equilibrium with dinitrogen tetroxide gas, which is colorless.
2NO2(g) ⇌ N2O4(g)
When the light brown color equilibrium mixture was moved from room temperature to a lower temperature, the mixture turned lighter brown in color. Which of the following conclusions about this equilibrium mixture is true?
This reaction is endothermic because the system shifted to the left on cooling.
This reaction is endothermic because the system shifted to the right on cooling.
This reaction is exothermic because the system shifted to the left on cooling.
This reaction is exothermic because the system shifted to the right on cooling.
Answer:
This reaction is exothermic because the system shifted to the right on cooling.
Step-by-step explanation:
2NO₂ ⇌ N₂O₄
brown colourless
According to Le Châtelier's Principle, when a stress is applied to a system at equilibrium, the system will respond in a way that tends to relieve the stress.
You applied a stress by cooling the system (removing heat). The system responded by moving in a direction that created more heat.
The mixture became lighter brown on cooling, so the position of equilibrium must have shifted to the right to generate the heat.
The reaction is exothermic.
When the light brown color equilibrium mixture was moved from room temperature to a lower temperature, the mixture turned lighter brown in color shows this reaction is exothermic because the system shifted to the right on cooling.
What is equilibrium law?According the the equilibrium law, if any external element is added in the equilibrium state, ten the whole reaction will shifts to that side which reduces the effect of that additional element.
Given chemical reaction is:
2NO₂(g) ⇌ N₂O₄(g)
Where NO₂ shows brown color and N₂O₄ is colorless gas. If we notice a light brown color of the mixture when we moved from room temperature to a lower temperature then the reaction will shifts to the right side and will show exothermic behavior to overcome the external effect.
Hence, option (d) is correct.
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Adding soap to water disrupts the hydrogen bonding between water molecules. A water strider is standing on the surface of a dish of water. What is most likely to happen if a drop of dish soap is added to the water?

The water strider will be able to move more quickly over the water’s surface because of reduced friction.

The water strider will have more difficulty moving its feet because they will be more strongly attracted to the water.

The water strider will be unable to remain on the water’s surface because of the loss of surface tension in the water.
the answer is,
C. The water strider will have more difficulty moving its feet because they will be more strongly attracted to the water.
Answer:
the answer is D. edg. 2020
Explanation:
the equation below shows the decomposition of lead nitrate. how many grams of oxygen are produced when 11.5g NO2 is formed?
2Pb(NO3)2(s) -> 2PbO(s) + 4NO2(g) + O2(g)
a. 2.88 g
b. 2.00 g
c. 32.0 g
d. 1.00 g
PLEASE AND THANK YOU IN ADVANCE
Final answer:
2.00 g of oxygen is produced ,option B
Explanation:
To determine how many grams of oxygen are produced when 11.5 g of NO2 is formed, we can use the stoichiometry of the balanced chemical equation:
2 Pb(NO3)2(s) = 2 PbO(s) + 4 NO2(g) + O2(g)
From the equation, we see that 4 moles of NO2 are produced alongside 1 mole of O2. First, we find the number of moles of NO2 that 11.5 g corresponds to:
Molar mass of NO2 = 14.01 (N) + (2 *16.00) (O) = 46.01 g/mol
Moles of NO2 = 11.5 g / 46.01 g/mol
Then, we take into account the mole ratio between NO2 and O2, which is 4:1:
Moles of O2 = (Moles of NO2) times (1 mole O2 / 4 moles NO2)
Finally, we find the mass of O2 produced:
Molar mass of O2 = 2 times 16.00 g/mol = 32.00 g/mol
Mass of O2 = (Moles of O2) times (32.00 g/mol)
By going through the calculations, we find that the mass of O2 produced is 2.00 g, which corresponds to option (b).