The enthalpy of vaporization, (symbol ∆Hvap) also known as the (latent) heat of vaporization or heat of evaporation, is the amount of energy (enthalpy) that must be added to a liquid substance, to transform a quantity of that substance into a gas.
A 0.100 M solution of K2SO4 would contain the same total ion concentration as which of the following solutions?0.0800 M Na2CO3 0.100 M NaCl 0.0750 M Na3PO4 0.0500 M NaOH
Answer:
The third chice: 0.0750 M Na₂SO₄Explanation:
Assume 100% ionization:
1) 0.100 M solution K₂SO₄
K₂SO4 (aq) → 2K⁺ (aq) + SO₄²⁻ (aq)Mole ratios: 1 mol K₂SO4 : 2 mol K⁺ + 1 mol SO₄²⁻ (aq) : 3 mol ions. This is 1 : 3At constant volume, the mole ratios are equal to the concentration ratios (M).1 M K₂SO₄: 3 M ions = 0.100 M K₂SO₄ / x ⇒ x = 0.300 M ionsThis means, that you have to find which of the choices is a solution that contains the same 0.300 M ion concentration.
2) 0.0800 M Na₂CO₃
Na₂CO₃ (aq) → 2 Na⁺ + CO₃⁻1 M Na₂CO₃ / 3 M ions = 0.0800M / x ⇒ x = 0.0267 M ionsThis is not equal to 0.300 M, so this solution would not contain the same total concentration as a 0.100 M solution of K₂SO₄, and is not the right answer.
3) 0.100 M NaCl
NaCl → Na⁺ + Cl⁻1 M NaCl / 2 M ions = 0.100 M NaCl / x ⇒ x = 0.200 M ionsThis is not equal to 0.300 M ion, so not a correct option.
4) 0.0750 M Na₃PO₄
Na₃PO₄ → 3Na⁺ + PO₄³⁻1 M Na₃PO₄ / 4 M ions = 0.0750 M Na₃PO₄ / x ⇒ x = 0.300 M ionsHence, this ion concentration is equal to the ion concentration of a 0.100 M solution of K₂SO₄, and is the correct choice.
5) 0.0500 M NaOH
NaOH → Na⁺ + OH⁻1 M NaOH / 2 mol ions = 0.0500 M NaOH / x ⇒ x = 0.100 M ionsNot equal to 0.300 M, so wrong choice.
A 0.100 M solution of K₂SO₄ has the same total ion concentration as a 0.0750 M solution of Na₃PO₄, both resulting in 0.300 M of ions.
K₂SO₄ dissociates into 2K⁺ and (SO₄)²⁻. Thus, a 0.100 M solution of K₂SO₄ produces 0.200 M K⁺ (2 x 0.100 M) and 0.100 M (SO₄)₂⁻, resulting in a total ion concentration of 0.300 M.
Let’s analyze the other solutions:
0.0800 M Na₂CO₃: Dissociates into 2 Na⁺ and (CO₃)²⁻, producing 0.160 M Na⁺ and 0.080 M (CO₃)²⁻. Total: 0.240 M ions.0.100 M NaCl: Dissociates into Na⁺ and Cl⁻, producing 0.100 M Na⁺ and 0.100 M Cl⁻. Total: 0.200 M ions.0.0750 M Na₃PO₄: Dissociates into 3 Na⁺ and (PO₄)³⁻, producing 0.225 M Na⁺ and 0.075 M (PO₄)³⁻. Total: 0.300 M ions.0.0500 M NaOH: Dissociates into Na⁺ and OH⁻, producing 0.050 M Na⁺ and 0.050 M OH⁻. Total: 0.100 M ions.The correct answer is 0.0750 M Na₃PO₄, as it also produces a total ion concentration of 0.300 M.
What is the oxidation number of chromium in k2cr2o7
Answer:
The oxidation state of chromium in K₂Cr₂O₇ is 6⁺ (i.e. + 6).Explanation:
You can calculate the oxidation number of most elements following some simple rules.
This is how you do it for chromium in K₂Cr₂O₇.
1) Rule: in a neutral compound the net oxidation number is zero (0).
Hence, sum of the oxidation numbers of K, Cr and O in K₂Cr₂O₇ is 0.
2) Rule: The most common oxidation number of oxygen in compounds, except in peroxides, is 2 ⁻ (negative 2).
3) Rule: the most common oxidation state of alkali metals is 1⁺ (positive 1)
4) Rule: multiply each oxidation state by the corresponding number of atoms in the compound (the subscripts)
2(1⁺) + 2(x) + 7(2⁻) = 0↑ ↑ ↑
K Cr O
2 + 2x - 14 = 02x - 12 = 02x = 12x = 6Hence, the oxidation number of chromium in this compound is 6⁺.
The oxidation number of chromium in K2Cr2O7 (potassium dichromate) is +6. This is determined by knowing that potassium has an oxidation number of +1, oxygen has an oxidation number of -2, and the sum of the oxidation numbers of the chromium atoms must balance the charge contributed by potassium and oxygen to make the compound neutral.
Explanation:The oxidation number of chromium in K2Cr2O7 requires some calculation using the rules of oxidation states. Firstly, potassium (K) has an oxidation number of +1, and each oxygen (O) has an oxidation number of -2. In the compound K2Cr2O7, there are two potassium atoms contributing a total of +2 to the charge of the compound. There are seven oxygen atoms each contributing -2, for a total of -14. Since the compound is neutral overall, the sum of the oxidation numbers of the chromium atoms must balance the negative charge contributed by the oxygen. Therefore, the total oxidation state for the two Cr atoms must be +12 in order to have a net charge of zero when added to the oxidation states of potassium and oxygen. Dividing this by two, since there are two chromium atoms, gives an oxidation number of +6 for each chromium atom.
Additionally, in the reduction half-reaction, Cr2O72- is reduced to Cr3+ with each chromium atom being in the +6 oxidation state initially. The chemical reaction involving the conversion of Fe2+ to Fe3+ supported by potassium dichromate provides further evidence that each chromium atom has an initial oxidation state of +6.
At a certain temperature and pressure, one liter of CO2 gas weighs 1.95 g.
What is the mass of one liter of C2H6 gas at the same temperature and pressure?
Answer:
1.332 g.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
At the same T and P and constant V (1.0 L), different gases have the same no. of moles (n):∴ (n) of CO₂ = (n) of C₂H₆
∵ n = mass/molar mass
∴ (mass/molar mass) of CO₂ = (mass/molar mass) of C₂H₆
mass of CO₂ = 1.95 g, molar mass of CO₂ = 44.01 g/mol.
mass of C₂H₆ = ??? g, molar mass of C₂H₆ = 30.07 g/mol.
∴ mass of C₂H₆ = [(mass/molar mass) of CO₂]*(molar mass) of C₂H₆ = [(1.95 g / 44.01 g/mol)] * (30.07 g/mol) = 1.332 g.
The mass of 1 liter of C2H6 gas at the same temperature and pressure as the CO2 can be calculated using Avogadro's principle and the proportionality of molar masses. You set up a proportion using the molar masses of CO2 and C2H6 and the given weight of CO2 to solve for the weight of C2H6 gas.
Explanation:First, you need to understand the concept of molar mass and Avogadro's principle. Avogadro's principle states that equal volumes of all gases, at the same temperature and pressure, have the same number of molecules.
The molar mass of CO2 is approximately 44.01 g/mol. Given that one liter of CO2 gas weighs 1.95g, we can calculate the molar volume of a gas at the given temperature and pressure. Because the weights will be proportional, we can use the molar mass of C2H6 to find the weight of 1 liter of C2H6 gas.
Since the molar mass of C2H6 (ethane) is approximately 30.07 g/mol, you can set up the proportion as follows: 44.01 / 1.95 = 30.07 / X. Solving this equation gives you the weight of C2H6.
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A molecule of an unsaturated hydrocarbon must have
1) at least one single carbon-carbon bond
2) at least one multiple carbon-carbon bond
3) two or more single carbon-carbon bonds
4) two or more multiple carbon-carbon bonds
Answer:
2) at least one multiple carbon-carbon bond.
Explanation:
An unsaturated hydrocarbon must have a double or triple C-C bond which is unsaturated bond that means it is not saturated with atoms.Saturated hydrocarbon is the hydrocarbon in which all C-C bonds are single.So, A molecule of an unsaturated hydrocarbon must have 2) at least one multiple carbon-carbon bond.
The structure of the periodic table is based on the distribution of A- protons B- electrons in each element. The elements are arranged in horizontal A- periods B- groups Vertical A- periods B- groups
Answer: B- electrons, A- periods, B- groups
Answer: The correct answer is Option A, Option A and Option B.
Explanation:
Elements in a periodic table are distributed in 7 Periods and 18 Groups.
The elements are distributed on the basis of increasing atomic numbers. Atomic number is defined as the number of protons that are present in an element.
Thus, the elements in the periodic table are distributed based on the distribution of protons.
The elements are arranged in vertical columns known as Groups and in horizontal rows known as Periods.
Hence, the correct answer is Option A, Option A and Option B.
Calculate the pressure in atmospheres of 0.5 mol of Helium ( He) at 20°C & occupying 2.50 L.
Answer:
4.811 atm.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm (P = ?? atm).
V is the volume of the gas in L (V = 2.5 L).
n is the no. of moles of the gas in mol (n = 0.5 mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K),
T is the temperature of the gas in K (T = 20°C + 273 = 293 K).
∴ P = nRT/V = (0.5 mol)(0.0821 L.atm/mol.K)(293 K)/(2.5 L) = 4.811 atm.
Which redox equation is correctly balanced?
(1) Cr3+ + Mg -> Cr + Mg2+
(2) Al3+ + K -> Al + K+
(3) Sn4+ + H2 -> Sn + 2H+
(4) Br2 + Hg -> Hg2+ + 2Br
The answer is 4), see the picture
The redox equation which is correctly balanced is: 4. [tex]Br_2 + Hg \rightarrow Hg^{2+} + 2Br[/tex]
What is a redox reaction?A redox reaction is also referred to as oxidation-reduction reaction and it can be defined as a type of chemical reaction in which the oxidation number of an atom of participating chemical species are changed.
In this scenario, the oxidation number of an atom of hydrogen is change from one to two. Thus, the redox equation which is correctly balanced is given by [tex]Br_2 + Hg \rightarrow Hg^{2+} + 2Br[/tex]
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A sample of a compound analyzed in a chemistry laboratory consists of 5.34 g of carbon, 0.42 g of hydrogen, and 47.08 g of chlorine. What is the percent composition of this compound?
Answer:
10.1 % Carbon, 0.8 % Hydrogen and 89.1 % Chlorine.
Explanation:
The total mass of the compound is 5.34 + 0.42 + 47.08 = 52.84 g.
The percentage of carbon is: [tex]\frac{5.34}{52.84}[/tex] × 100 = 10.1 %
The percentage of hydrogen is: [tex]\frac{0.42}{52.84}[/tex] × 100 = 0.8 %
The percentage if chlorine is: [tex]\frac{47.08}{52.84}[/tex] × 100 = 89.1 %
The percent composition of the compound is approximately 10.10% carbon, 0.797% hydrogen, and 89.10% chlorine.
To determine the percent composition of the compound, one must calculate the mass percentage of each element present in the sample. The mass percentage of an element is calculated by dividing the mass of that element by the total mass of the compound and then multiplying by 100%.
First, we need to find the total mass of the compound by summing the mass of all the elements present:
Total mass = Mass of carbon + Mass of hydrogen + Mass of chlorine
Total mass = 5.34 g + 0.42 g + 47.08 g
Total mass = 52.84 g
Now, we can calculate the mass percentage of each element:
Percent composition of carbon:
[tex]\( \frac{\text{Mass of carbon}}{\text{Total mass}} \times 100\% = \frac{5.34 \text{ g}}{52.84 \text{ g}} \times 100\% \approx 10.10\% \)[/tex]
Percent composition of hydrogen:
[tex]\( \frac{\text{Mass of hydrogen}}{\text{Total mass}} \times 100\% = \frac{0.42 \text{ g}}{52.84 \text{ g}} \times 100\% \approx 0.797\% \)[/tex]
Percent composition of chlorine:
[tex]\( \frac{\text{Mass of chlorine}}{\text{Total mass}} \times 100\% = \frac{47.08 \text{ g}}{52.84 \text{ g}} \times 100\% \approx 89.10\% \)[/tex]
Therefore, the percent composition of the compound is approximately 10.10% carbon, 0.797% hydrogen, and 89.10% chlorine.
12. What element is this? How do you know?
For question #13, use the following picture:
The changing of substances to other substances by the breaking of bonds in reactants and the formation of bonds in products.
Answer:
Definition of chemical change or reaction.Explanation:
The changing of substances to other substances by the breaking of bonds in reactants and the formation of bonds in products is the definition of chemical change or reaction.
Chemical reactions or cahnges are the transformation of pure substances, compounds or elements, into other substances by the breaking of some bonds adn the formation of other bonds.
The chemical reactions are represented by chemical equations with the reactants in the left side and the products in the right side, connected by the use of arrows.
For example, the chemical equation CH₄ (g) + O₂(g) → CO₂(g) + H₂O(g) represents the combustion reaction (chemical change) of methane (CH₄) with oxygen (O₂).
The products of the reaction are carbon dioxide (CO₂) and water (H₂O) which are the new substances formed by breaking the chemical bonds in CH₄ and O₂ and the formation of the bonds in the new molecules (CO₂ and H₂O).
Chemical equation: CH₄ (g) + O₂(g) → CO₂(g) + H₂O(g)
↑ ↑ ↑ ↑
-- reactants -- --- products --
The bonds in CH₄ and O₂ are brokenThe bonds in CO₂ H₂O are formedThe reactants have been transformed into different chemical compounds, so this is a chemical changle.
Chemical reactions involve the changing of substances through the breaking and formation of bonds. Reactants are the starting substances, while products are the resulting substances. The direction of the reaction is indicated by an arrow.
Explanation:Chemical reactions occur when two or more atoms bond together to form molecules or when bonded atoms are broken apart. The substances used in a chemical reaction are called the reactants (usually found on the left side of a chemical equation), and the substances produced by the reaction are known as the products (usually found on the right side of a chemical equation). An arrow is typically drawn between the reactants and products to indicate the direction of the chemical reaction; this direction is not always a 'one-way street.'
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What type of intermolecular forces are present in liquid methanol?
Answer:
Hydrogen bonds
Explanation:
Hydrogen bonds are bonds formed in polar molecules in which an hydrogen atom is directly joined to a highly electronegative atom such as oxygen or nitrogen or fluorine.
A hydrogen bond is just an electrostatic attraction between a hydrogen atom of one molecule and the electronegative atom of a neighboring molecule.
Methanol has a formula of CH₃OH and the hydrogen bond is between the H and O.
Liquid methanol exhibits hydrogen bonding, dipole-dipole interactions, and dispersion forces. The primary intermolecular force is hydrogen bonding due to the -OH group present in methanol molecules. These forces contribute to methanol's relatively high boiling point.
Liquid methanol exhibits several types of intermolecular forces. The primary intermolecular force in methanol is hydrogen bonding.
Methanol molecules contain an -OH group, where the hydrogen atom is bonded to a highly electronegative oxygen atom.
This allows each methanol molecule to form hydrogen bonds with other methanol molecules. Additionally, methanol exhibits dipole-dipole interactions due to its polar nature.
Lastly, dispersion forces (also known as London dispersion forces) are present in all molecular substances, including methanol, although they are generally weaker compared to the other two types of forces.
Hydrogen Bonding: The hydrogen atom of one methanol molecule forms a hydrogen bond with the oxygen atom of a neighboring methanol molecule.Dipole-Dipole Interactions: Methanol's polar molecules align so that the positive end of one molecule is attracted to the negative end of another.Dispersion Forces: These are weak forces arising from temporary fluctuations in electron density.Understanding these intermolecular forces helps explain why methanol has a relatively high boiling point compared to non-polar substances of similar molecular weight.
What is meant by the half-life of a radioactive substance
Answer:
The half-life of a radioactive substance is the time the substance takes to be reduced by half of its initial amount as a consequence of decay.
Explanation:
The half-life of a radioactive substance is the time the substance takes to be reduced by half of its initial amount as a consequence of decay.It is a characteristic constant.It is known that the decay of a radioactive isotope isotope obeys first order kinetics.Also, it is clear that in first order decay the half-life time is independent of the initial concentration.A sodium atom has an electron configuration of 1s22s22p63s1.if the sodium atom becomes ionized, its new electron configuration will be the same as which element? select one:a. neonb. magnesiumc. lithiumd. potassium
Answer:
Neon
Explanation:
1s² 2s² 2p⁶ 3s¹ or [Ne] 3s¹
The outer most shell is the 3s¹.
For this atom to achieve stability, if it loses the electron in the 3s shell, it would resemble an inert element with a complete octet configuration. Therefore, the atom would be like:
1s² 2s² 2p⁶ which is the configuration of Ne
How would the volume of helium in a balloon be affected if the balloon was placed in a room where air temperature is lower?
Answer:
The volume will decrease.
Explanation:
According to Charles' Law, the volume of a gas is directly proportional to its temperature.
V = kT
Thus, if T decreases, V decreases.
Explanation:
So,when balloon filled with helium gas was placed in lower temperature we will observe that the volume of the helium gas inside the helium will decrease due to which size of the balloon will also get decreased.
This is because volume is directly proportional to the temperature of the gas at constant pressure and number of moles. And this law is known as Charles law of
[tex]V\propto T[/tex] (At constant pressure and number of moles)
Practice 11: Balance this redox reaction using the oxidation-number change method and describe each step you used:
HCl (aq) + Zn (s) → ZnCl2 (s) + H2 (g)
Answer:
2 HCl(aq) + Zn(s) = ZnCl2(s) + H2(g)
Single Replacement Reaction
1. Including a full-wave rectifier in an AC circuit will yield a/an _______ current.
A. continuous alternating
B. continuous direct
C. intermittent alternating
D. intermittent direct
2. A transmission system at a radio station uses a/an _______ to convert a direct current into a high-frequency alternating current.
A. modulator
B. oscillator
C. demodulator
D. transmitting antenna
3. Combining which of the following substances with germanium will cause the germanium to emit free electrons?
A. Indium
B. Gallium
C. Bismuth
D. Aluminum
6. Which of the following does not affect the electrical resistance of a body?
A. Bodies directly surrounding the body
B. Length of the body
C. Temperature of the body
D. Material composing the body
8. Which of the following is an accurate description of the relationship demonstrated in Ohm's Law?
A. The resistance (ohms) divided by the current (amperes) equals the electric potential (volts).
B. The electric potential (volts) divided by the current (amperes) equals the resistance (ohms).
C. The electric potential (volts) multiplied by the resistance (ohms) equals the current (amperes).
D. The electric potential (amperes) divided by the resistance (ohms) equals the current (volts).
11. A series circuit contains a generator, two devices, and connecting wires. The resistances of the two devices are 15 ohms and 10 ohms. The voltage supplied by the generator is 75 V. What will be the voltage drop in the device with 10 ohms of resistance?
A. 3 V
B. 45 V
C. 25 V
D. 30 V
13. If a bar magnet's neutral region is broken in two, what will most likely occur?
A. Each of the two segments of the original bar magnet will have a north and south pole.
B. The segment that's longer will have a north and south pole.
C. One segment will have only a north pole, the other segment will have only a south pole.
D. Neither segment will have a north or south pole
16. Which of the following would decrease the resistance to the flow of an electric current through a body?
A. Using a conductor with a smaller cross section
B. Lengthening the conductor
C. Shortening the conductor
D. Heating the conductore
each question is worth 5 points I will give brainliest answer
1) B) continuous direct.
2) B) oscillator.
3) C) Bismuth.
6) I dont know this one sorry :/
8) B) The electric potential (volts) divided by the current (amperes) equals the resistance (ohms).
11) D) 30 V
13) A) Each of the two segments of the original bar magnet will have a north and south pole.
16) C) Shortening the conductor.
The chemical element found in all amino acids but not found in either carbohydrates or fats is
Answer:
Nitrogen
Explanation:
In a chemical equation the arrow (indicating a reaction) points in which direction
The molar concentration of sucrose in a can of soda is 0.375 M. How much sucrose would be found in a 2 liter bottle of soda of the same concentration?
A)
0.075 mol
B)
0.19 mol
C)
0.75 mol
D)
1.9 mol
Answer:
C) 0.75 mol.
Explanation:
Molarity is defined as the no. of moles of solute dissolved in 1.0 L of the solution.So, The molar concentration of sucrose in a can of soda is 0.375 M means that: every 1.0 L of sucrose contains 0.375 mol of sucrose.
∴ 2 liter bottle of soda of the same concentration contains (2 * 0.375 mol = 0.75 mol) of sucrose.
Thus, the right choice is: C) 0.75 mol.
Which equation is an example of an endothermic reaction?
Na + Br -> NaBr + Heat
H20 (s) + heat -> H2O (l)
both
neither
Answer:
H₂0[tex]_{(s)}[/tex] + heat → H₂O[tex]_{(l)}[/tex]
Explanation:
An ENDOTHERMIC reaction is a chemical reaction in which heat is absorbed by the reactants. As such the product is usually cooler than the products. In the equation above (the answer), heat is on the reactant side of the equation thus indicating that heat is absorbed by the reactants.
On the other hand, in the first equation heat is on the product side of the equation which is consistent with an Exothermic reaction.
Binary molecular compounds are composed of two ______ elements
Answer:
Non-metal
Explanation:
Molecular compounds are formed through covalent bonds. Covalent bonds occur between non-metals only and they form what we call molecules, hence the name molecular compound.
An example of a molecular compound is carbon monoxide or CO. Carbon is a non-metal and oxygen is a non-metal, so you know that they form a covalent bond.
That's the difference with ionic compounds. Ionic bonds form ionic bonds and these bonds occur between a metal and a non-metal.
Binary molecular compounds are made of two nonmetallic elements and have specific naming conventions such as prefixes to denote the number of atoms.
Binary molecular compounds are composed of two nonmetallic elements. They are named using a specific nomenclature that includes prefixes to indicate the number of atoms of each element present in the compound. For example, carbon dioxide, CO₂, is a binary molecular compound consisting of one carbon atom and two oxygen atoms.
In order to synthesize proteins, carbohydrates, lipids, and nucleic acids, cells require _____.
disaccharides
energy
an adenosine group
a sugar group
Answer:
Energy
Explanation:
A sugar group would be used for carbohydrates or nucleic acids. An adenosine group would be used in ATP formation if I recall correct. And disaccharides are just two monosaccharides linked together, so that would also be for carbohydrates. Therefore, energy is the answer.
I NEED HELP ASAP!!! THIS IS A 30 POINT QUESTION!!!
Which statement best describes the steps leading up to protein synthesis?
( 1 )The translation of DNA to RNA occurs in the cytoplasm; then, the transcription of RNA occurs in the nucleus.
( 2 )The transcription of DNA to RNA occurs in the cytoplasm; then, the translation of RNA occurs in the nucleus.
( 3 )The translation of DNA to RNA occurs in the nucleus; then, the transcription of RNA occurs in the cytoplasm.
( 4 ) The transcription of DNA to RNA occurs in the nucleus; then, the translation of RNA occurs in the cytoplasm.
Answer:
4
Explanation:
Protein synthesis involves two major steps:
Transcription of the DNA to mRNA (a form of RNA)Translation of the mRNA molecule into a protein.Transcription involves the formation of a nucleotide sequence complementary to the DNA molecule, with the pairing of a different base, Uracil, with Guanine instead of the usual Thymine base. This occurs in the nucleus of the cell, and the resulting molecule is known as the mRNA.
This mRNA is transported into the cytoplasm through the nuclear pore for the next step, translation. This is primarily accomplished by ribosomes and tRNA molecules which are present in the cytoplasm of the cell. The result of this step is the generation of a protein molecule.
Hope this helpsAnswer:
its A, C and E (1, 3, 5)
i did this on edgenuiti and it was correct =)
mark as brainliest i really need it bc if not i'll never level up i have 797/500 points
What amounts do you compare when measuring concentration
Answer:
When measuring concentration you compare the amount of solute to the amount of solvent or solution.Explanation:
The concentration is a measure of how much solute is present in certain amount of solvent or solution. There are many quantitative expressions for the concentration. Some of those expressions are: percentage, molarity, molality, molar fraction, among others.
This table shows the expressions for some concentration measures, showing the amounts compared.
Concentration amounts compared in form of ratio
Percentage, mass/mass (mass of solute / mass of solution) × 100
Percentage, vol./vol. (vol. of solue / vol. of solution) × 100
Molarity (moles of solute / liters of solution)
Molality (moles of solute / Kg of solvent)
CH4 + 2O2 ? CO2 + 2H2O In the chemical reaction, if 10 moles of H2O are produced, moles of CO2 are also produced.
Answer:
5 moles
Explanation:
This reaction (in the question) is a combustion reaction.
A combustion reaction is a reaction in which a substance (in this case an organic compound) is burnt in excess oxygen to produce carbon dioxide and water.
From the equation in the question, it can be deduced that the moles of the products are in the ratio 1:2 for CO₂ and H₂O respectively. Hence, when 10 moles of H₂O is produced, 5 moles of CO₂ will be produced.
1:2 (from the equation)
5:10 (for the answer) ⇔ which is still the same as 1:2
Express this as a chemical equation: Hydrogen gas bubbled through a solution of silver nitrate?
Answer:
H₂ (g) + 2AgNO₃ (aq) → 2HNO₃ (aq) + 2Ag (s)Explanation:
1) Word equation:
Hydrogen gas + silver nitrate → nitric acid + silver2) Chemical (skeleton) equation:
Include phases but do not balance it (yet). The symbology used is:
(g) for gas(aq) for aqueous solution(s) for solidH₂ (g) + AgNO₃(aq) → HNO₃ (aq) + Ag (s)3) Balanced chemical equation:
Add the needed coefficients to make the number of atoms of each kind equal on both sides:
H₂ (g) + 2AgNO₃ (aq) → 2HNO₃ (aq) + 2Ag (s) ← answerThe chemical equation that represents hydrogen gas being bubbled through a solution of silver nitrate is: 2AgNO3(aq) + H2(g) -> 2Ag(s) + 2HNO3(aq). This is a redox reaction where silver is reduced and hydrogen is oxidized.
Explanation:When hydrogen gas is bubbled through a solution of silver nitrate, a chemical reaction occurs. This can be written as a chemical equation:
2AgNO3(aq) + H2(g) -> 2Ag(s) + 2HNO3(aq)
In this equation, hydrogen gas (H2) reacts with silver nitrate (AgNO3) in the solution to form solid silver (Ag) and nitric acid (HNO3). This is a redox reaction, where silver is reduced (gains electrons) and hydrogen is oxidized (loses electrons).
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in which of the following is the solution concentration expressed in percent by volume
10 mL of solute
_________ x 100%
100 ml of solvent
10 g of solute
_________ x 100%
100 ml of solvent
10 mL of solute
_________ x 100%
100 ml of solution
10 g of solute
_________ x 100%
100 ml of solution
Answer : The correct option is, [tex]\frac{10g\text{ of solute}}{100ml\text{ of solution}}\times 100\%[/tex]
Explanation :
The solution concentration expressed in percent by volume means that the amount of solute present in 100 parts volume of solution.
It is represented in formula as :
[tex]\text{Percent solution by volume}=\frac{\text{Amount of solute}}{\text{Amount of solution}}\times 100\%[/tex]
Or,
[tex]\text{Percent solution by volume}=\frac{10g\text{ of solute}}{100ml\text{ of solution}}\times 100\%[/tex]
Hence, the correct option is, [tex]\frac{10g\text{ of solute}}{100ml\text{ of solution}}\times 100\%[/tex]
If ice is warmed and becomes a liquid which type of process is it
Answer:
EndothermicExplanation:
Endothermic means that the process makes that the system (substance) absorbs heat energy from the surroundings. In this case the heat is supplied to the ice (from a flame for example). So, the ice is absorbing this heat.
In general, the phase change from solid (ice) to liquid is endothermic because the solid substance has a lower kinetic energy than the liquid particles. So, the solid must gain energy (which is supplied in the form of heat) to become liquid.
The reason why the solid particles have lower kinetic energy than liquid ones is that the particles vibrate and translates quicker in the liquid state than in the solid state.
Which of the following descriptions accurately describes Boyle’s law?
How well a gas dissolves in a liquid such as blood depends on both its partial pressure and its solubility.
The pressure of gas in your lungs is inversely proportional to the volume in your lungs.
The partial pressure of a gas in the air you breathe in is equal to the total atmospheric pressure
The pressure of gas in your lungs is inversely proportionate to the volume in your lungs.
The description that accurately describes Boyle's law is the pressure of gas in your lungs is inversely proportional to the volume in your lungs. Option C is correct.
Boyle's law states that at a constant temperature, the pressure of a gas is inversely proportional to its volume. This means that if the pressure of a gas increases, the volume of the gas will decrease, and vice versa.
In the lungs, the pressure of the air is determined by the amount of air that is in the lungs. When you breathe in, the volume of your lungs increases, which decreases the pressure of the air in your lungs. When you breathe out, the volume of your lungs decreases, which increases the pressure of the air in your lungs.
Boyle's law is an important principle in the study of gases and is used in many different applications, such as scuba diving and meteorology. Option C is correct.
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A student is performing an experiment to study thermodynamics. The student mixes citric acid and sodium bicarbonate in a calorimeter to determine the energy released in the chemical reaction. In one paragraph, identify the system, the surroundings, and the reasons for using calorimetry in this type of experiment.
Explanation :
In thermodynamics, a system is region or part of space which is being studied and observed while the surrounding is the region or space around the system which interacts with the system.
Here in the experiment ,system which is observed is reaction or changes when citric acid and sodium bicarbonate are mixed together. And the mixing is carried out in the calorimeter which serves as a surrounding around the system.
The reason behind the using the calorimeter is measure the energy change occurring during the reaction.