Final answer:
The concentration of the HBr solution is 0.001888 M.
Explanation:
To determine the concentration of the HBr solution, we need to use the equation:
HBr(aq) + NaOH(aq) → NaBr(aq) + H2O(l)
From the balanced equation, we can see that the mole ratio of HBr to NaOH is 1:1. Since the volume of NaOH required to reach the equivalence point is 18.88 mL, we can calculate the number of moles of NaOH used:
Moles of NaOH = concentration of NaOH (M) × volume of NaOH (L)
Moles of NaOH= 0.100 M × 0.01888 L = 0.001888 mol of NaOH
Since HBr and NaOH have a 1:1 mole ratio, the concentration of the HBr solution is also 0.001888 M.
Which pair of elements is most apt to form an ionic compound with each other?
What is the molar mass of (NH4)2O? Explain how you calculated this value.
The molar mass of (NH₄)₂O (ammonium oxide) is 52.10 g/mol.
To calculate the molar mass of (NH₄)₂O (ammonium oxide), we need to determine the total sum of the atomic masses of all the atoms in the chemical formula.
The atomic masses are as follows:
N (Nitrogen) = 14.01 g/mol
H (Hydrogen) = 1.01 g/mol
O (Oxygen) = 16.00 g/mol
Now, let's calculate the molar mass of (NH₄)₂O:
Molar mass of (NH₄)₂O = (2 x N) + (8 x H) + (1 x O)
Molar mass of (NH₄)₂O = (2 x 14.01 g/mol) + (8 x 1.01 g/mol) + (1 x 16.00 g/mol)
Molar mass of (NH₄)₂O = 28.02 g/mol + 8.08 g/mol + 16.00 g/mol
Molar mass of (NH₄)₂O = 52.10 g/mol
So, the molar mass of (NH₄)₂O (ammonium oxide) is approximately 52.10 g/mol.
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What is the net ionic equation of the reaction of mgso4 with sr(no3)2?
The net ionic equation for the reaction is as follows:[tex]\boxed{{\text{SO}}_4^{2 - }\left( {aq} \right) + {\text{S}}{{\text{r}}^{2 + }}\left( {aq} \right) \to {\text{SrS}}{{\text{O}}_4}\left( s \right)}[/tex]
Further Explanation:
Double displacement reaction is defined as the reaction in which ions of two compound interchange with each other to form the product. For example, the general double displacement reaction between two compound AX and BY is as follows:
[tex]{\text{AX}} + {\text{BY}} \to {\text{AY}} + {\text{BX}}[/tex]
The three types of equations that are used to represent the chemical reaction are as follows:
1. Molecular equation
2. Total ionic equation
3. Net ionic equation
The molecular equation represents the reactants and products of the ionic reaction in undissociated form. In total ionic equation, all the dissociated ions that are present in the reaction mixture are represented and in net ionic reaction, the useful ions that participate in the reaction are represented.
The steps to write the net ionic reaction are as follows:
Step 1: Write the molecular equation for the reaction with the phases in the bracket.
In the reaction, [tex]{\text{MgS}}{{\text{O}}_4}[/tex] reacts with [tex]{\text{Sr}}{\left( {{\text{N}}{{\text{O}}_{\text{3}}}} \right)_2}[/tex] to form [tex]{\text{SrS}}{{\text{O}}_4}[/tex] and [tex]{\text{Mg}}{\left( {{\text{N}}{{\text{O}}_{\text{3}}}} \right)_2}[/tex]. The balanced molecular equation of the reaction is as follows:
[tex]{\text{MgS}}{{\text{O}}_4}\left( {aq} \right) + {\text{Sr}}{\left( {{\text{N}}{{\text{O}}_{\text{3}}}} \right)_2}\left( {aq} \right) \to {\text{SrS}}{{\text{O}}_4}\left( s \right) + {\text{Mg}}{\left( {{\text{N}}{{\text{O}}_{\text{3}}}} \right)_2}\left( {aq} \right)[/tex]
Step 2: Dissociate all the compounds with the aqueous phase to write the total ionic equation. The compounds with solid phase remain same. The total ionic equation is as follows:
[tex]{\text{M}}{{\text{g}}^{2 + }}\left( {aq} \right) + {\text{SO}}_4^{2 - }\left( {aq} \right) + {\text{S}}{{\text{r}}^{2 + }}\left( {aq} \right) + 2{\text{NO}}_3^ - \left( {aq} \right) \to {\text{SrS}}{{\text{O}}_4}\left( s \right) + {\text{M}}{{\text{g}}^{2 + }}\left( {aq} \right) + 2{\text{NO}}_3^ - \left( {aq} \right)[/tex]
Step 3: The common ions on both the sides of the reaction get cancelled out to get the net ionic equation.
[tex]\boxed{{\text{M}}{{\text{g}}^{2 + }}\left( {aq} \right)} + {\text{SO}}_4^{2 - }\left( {aq} \right) + {\text{S}}{{\text{r}}^{2 + }}\left( {aq} \right) + \boxed{2{\text{NO}}_3^ - \left( {aq} \right)} \to {\text{SrS}}{{\text{O}}_4}\left( s \right) + \boxed{{\text{M}}{{\text{g}}^{2 + }}\left( {aq} \right)} + \boxed{2{\text{NO}}_3^ - \left( {aq} \right)}[/tex]
Therefore, the net ionic equation obtained is as follows:
[tex]{\text{SO}}_4^{2 - }\left( {aq} \right) + {\text{S}}{{\text{r}}^{2 + }}\left( {aq} \right) \to {\text{SrS}}{{\text{O}}_4}\left( s \right)[/tex]
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Answer details:
Grade: High School
Subject: Chemistry
Chapter: Chemical reaction and equation
Keywords: Double displacement reaction, types of equation, molecular equation, total ionic equation, net ionic equation, MgSO4, Sr(NO3)2, SrSO4, Mg(NO3)2.
The net ionic equation for the reaction of MgSO4 and Sr(NO3)2 is SO4^2- (aq) + Sr^2+ (aq) → SrSO4(s). The other ions, magnesium and nitrate, are considered 'spectator ions' and hence not included in the net ionic equation as they do not take part in the reaction.
Explanation:The reaction of MgSO4 (magnesium sulfate) and Sr(NO3)2 (strontium nitrate) is a double displacement reaction. The balanced chemical equation for this reaction is: MgSO4 + Sr(NO3)2 → Mg(NO3)2 + SrSO4.
However, the question asks for the net ionic equation. This involves expressing the reaction in terms of the ions that are present. We first need to know that MgSO4 and Sr(NO3)2 are strong electrolytes and will dissociate into ions in a solution.
When we complete these steps, the net ionic equation for this reaction is: SO4^2- (aq) + Sr^2+ (aq) → SrSO4(s). The other ions are considered 'spectator ions' and are not included in the net ionic equation because they do not participate in the reaction. So the magnesium and nitrate ions are not included in the net ionic equation.
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If you mechanically shook a mixture of phospholipids and water, what would you expect to see when you observe the solution using an electron microscope?
Answer: two layer liquid (bilayer)
Explanation:
First of all let me explain a few terms
Hydrophobic side: means water disliking part... From the phobia.
Hydrophilic side means water loving side.
So the phospholipid have this two parts. When you shake it in water, the hydrophilic part will interact and mix with water while the hydrophobic part will just float and separated into two layers.. Just like pouring groundnut oil into water.
A certain weak acid, ha, has a ka value of 8.4×10−7. calculate the percent ionization of ha in a 0.10 m solution
To
determine the percent ionization of the acid given, we make use of the acid
equilibrium constant (Ka) given. It is the ratio of the equilibrium
concentrations of the dissociated ions and the acid. The dissociation reaction
of the HF acid would be as follows:
HA = H+ + A-
The acid equilibrum constant would be expressed as follows:
Ka = [H+][A-] / [HA] = 8.4 x 10^-7
To determine the equilibrium concentrations we use the ICE table,
HF
H+ A-
I 0.10 0
0
C -x +x
+x
---------------------------------------------
E 0.10-x x
x
8.4 x 10^-7= [H+][A-] / [HA]
8.4 x 10^-7 = [x][x] / [0.10-x]
Solving for x,
x = 0.0002894 = [H+] = [A-]
percent ionization = 0.0002894 / 0.10 x 100 = 0.289%
Which of the types of compounds listed below is/are considered to be functional groups, or families, of organic compounds? salts (example: table salt, sodium chloride) alcohols (example: ethyl alcohol, the alcohol found in beer and wine) carboxylic acids (example: formic acid, found in the venom of red ants) bases (example: ammonia)?
Among salts, alcohols, carboxylic acids and bases, only alcohols and carboxylic acids qualify as functional groups or families of organic compounds, because of their relevant functional groups. Salts and bases are excluded in this context.
Explanation:From the list you provided - salts, alcohols, carboxylic acids and bases, the types that are classified as functional groups or families of organic compounds are alcohols and carboxylic acids. Salts and bases are important in various chemical processes but do not fall into the category of organic compounds' functional groups. A functional group is essentially an atom or a group of atoms that determine the physical and chemical properties of a molecule. For instance, ethyl alcohol belongs to the alcohol family because of the presence of the hydroxyl (-OH) functional group, while formic acid is in the carboxylic acid family thanks to its carboxyl (-COOH) group.
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The keq of a reaction is 4 x 10-7. at equilibrium, the
Consider the reaction cl2(g) + br2(g) <=> 2 brcl(g), which is endothermic as written. what would be the effect on the equilibrium position of removing cl2(g)?
what is the percent composition in chloric acid (HClO3)?
What is the molarity of the solution made by dissolving a 5.67 g of potassium chloride in enough water to make 100 mL of the solution
What does mass measure?
What observations would lead you to believe that the ink is actually a mixture?
Matter appears to be conserved in chemical reactions but not in nuclear reactions because:
A. the law of conservation of matter only applies to a limited number of chemical and nuclear reactions
B. the law of conservation of mass-energy applies only to nuclear reactions
C. in nuclear reactions, particles move too quickly to have their masses measured
D. in nuclear reactions the changes in mass are large enough to be detected
I think it's A? Just tell me if I'm right, and if I'm wrong, point me in the right direction :)
which statement best describes why specific heat capacity is often more useful than heat capacity for scientists while comparing two materials
Answer:
A.
key words: intensive, does not depend on sample size
Explanation:
What elements make up molecules of sugar?
Calculate the vapor pressure of a solution containing 28.0 g of glycerin (c3h8o3) in 120 ml of water at 30.0 âc. the vapor pressure of pure water at this temperature is 31.8 torr. assume that glycerin is not volatile and dissolves molecularly (i.e., it is not ionic) and use a density of 1.00 g/ml for the water.
What is the only subatomic particle that is directly involved in the chemical reactions?
The Valence Electrons of an Atom of Which Element would feel a Greater Effective Nuclear Charge than the Valence?
The Valence Electrons of an Atom of which element would feel a greater effective Nuclear Charge than the valence electrons of a Boron (B) atom?
Aluminum (Al)
Beryllium (Be)
Hydrogen (H)
Carbon (C)
Carbon's valence electrons feel a greater effective nuclear charge than those of a Boron atom because Carbon has one more proton without significantly increasing the shielding effect, leading to a stronger pull on the valence electrons.
Explanation:The question asks which element's valence electrons feel a greater effective nuclear charge than those of a Boron (B) atom. To answer this, one must understand how shielding and effective nuclear charge work. As we go from left to right across a period in the periodic table, while the number of core electrons remains the same, the nuclear charge increases. This means the valence electrons feel a stronger pull from the nucleus since they are not effectively shielded by the same number of core electrons. Comparing Boron with Aluminum (Al), Beryllium (Be), Hydrogen (H), and Carbon (C), we find that Carbon, having one more proton than Boron, does not increase the shielding effect significantly, which leads to its valence electrons feeling a greater effective nuclear charge than Boron's. Therefore, Carbon (C) is the correct response.
Brainliest if answered in the next 5 minutes.
Identify the balanced combination equation.
Cl2O5 + H2O ⟶ 2HClO3
2Fe(OH)3 ⟶ Fe2O3 + 3H2O
Cl2O5 + 3H2O ⟶ HClO3
2Fe(OH)3 ⟶ 2FeO3 + 3H2O
Answer: The correct answer is [tex]Cl_2O_5+H_2O\rightarrow 2HClO_3[/tex]
Explanation:
Combination reaction is defined as the type of reaction in which teo smaller compounds join or combine together to form a large compound.
General representation is given by:
[tex]A+B\rightarrow AB[/tex]
A balanced chemical equation always follow law of conservation of mass. The law states that the total number of individual atoms on the reactant side is always equal to the total number of atoms on the product side.
From the given options:
The equation that is an example of balanced combination reaction is
[tex]Cl_2O_5+H_2O\rightarrow 2HClO_3[/tex]
Use the periodic table to select the element from the drop-down menu that has the correct relative electronegativity.
Mg >
P >
C <
Br <
Answers
Mg > Ca
P > As
C <N
Br < Cl
Final answer:
Using the periodic table, one can predict that the order of increasing electronegativity for Mg, P, C, and Br is Mg < Br < C < P. Mg is a metal, while P, C, and Br are nonmetals.
Explanation:
The question involves using the periodic table to determine the relative electronegativity of elements. Electronegativity increases from the lower left to the upper right of the periodic table. Hence, we can predict the relative electronegativity for the elements given:
Mg (Magnesium) has a lower electronegativity compared to most other elements since it's in the second column and third period.P (Phosphorus) generally has a higher electronegativity than Mg as it is to the right and above Mg.C (Carbon) is to the left and below P in the periodic table, which means P is more electronegative than C.Br (Bromine) is below and to the right of C and has a lower electronegativity than C since it is lower in the periodic table, despite being to the right.Therefore, the order from lowest to highest electronegativity is Mg < Br < C < P.
Regarding classification:
Mg is a metal located to the left of the stair-step line on the periodic table.P is a nonmetal found to the right of the stair-step line.C is also a nonmetal positioned to the right and far from the stair-step line.Br is a nonmetal as well, located near the stair-step line but clearly on the nonmetal side.What is the H+ if the pH of a solution is 1.65?
Answer:
[H⁺] = 2.2 × 10⁻²
Explanation:
pH = -log [H⁺]
10∧-pH = [H⁺]
[H⁺] = 10⁻¹°⁶⁵
[H⁺] = 0.0224
[H⁺] = 2.2 × 10⁻²
So the concentration of hydrogen in solution of 1.65 pH is 2.2 × 10⁻².
Describe one chemical property of Group 1 metals that results from the atoms of each metal having only one valence electron.
A chemical property of Group 1 metals that results from the atoms of each metal having only one valence electron is electronegativity.
Group 1 elements are also known as alkali metals. They include sodium, lithium, potassium, cesium, francium, and rubidium. They can be found in seawater.
A chemical property of Group 1 metals that results from the atoms of each metal having only one valence electron is electronegativity. This means the tendency for the atoms to be able to attract electrons.
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What is the average kinetic energy of a gas at 285 kelvin? (R = 8.314 J/K-mol)
Answer:
The average KE = 312 J/mol
Explanation:
Given:
Temperature of the gas, T = 285 K
Gas constant, R = 8.314 J/K-mol
To determine:
The average kinetic energy of the gas
Explanation:
Based on the kinetic theory of gases, the average kinetic energy is given as:
[tex]KE = \frac{3}{2} RT\\[/tex]
In this case:
[tex]KE = \frac{3}{2} *8.314\ J/K-mol * 285\ K = 312 J/mol[/tex]
Shari was in the kitchen when she heard a crash. She went into her bedroom and found her window broken and a baseball lying on the ground. Shari said "this baseball broke my window.” This statement is an
inference because she is blaming someone else for the broken window.
inference because she drew a conclusion based on evidence.
observation because she heard the crash before she came into the room.
observation because she can see the evidence
What is the repeating unit in the polymer –ch2–ccl2–ch2–ccl2–ch2–ccl2– ?
Which of the following changes requires an oxidizing agent?
O2 yields 2O2-
SO3 yields SO42-
2F- yields F2
MnO2 yields Mn2+
Answer : The correct option is, [tex]2F^-\rightarrow F_2+2e^-[/tex]
Explanation :
Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In the oxidation reaction, the oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.
Oxidizing agent : It is defined as the substance which has ability to oxidize the other substances by gaining electrons.
Reduction reaction : It is defined as the reaction in which a substance gains electrons. In the reduction reaction, the oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.
Reducing agent : It is defined as the substance which has ability to reduce the other substances by losing electrons.
From the given options, we conclude that
(1) [tex]O_2+4e^-\rightarrow 2O^{2-}[/tex]
(2) [tex]SO_3+H_2O\rightarrow SO_4^{2-}+2H^+[/tex]
(3) [tex]MnO_2+4H^++2e^-\rightarrow Mn^{2+}+2H_2O[/tex]
The reaction 1, 2 and 3 shows the reduction reaction. So, it requires a reducing agent.
(4) [tex]2F^-\rightarrow F_2+2e^-[/tex]
The reaction 4 shows the oxidation reaction. Therefore, it requires an oxidizing agent.
Therefore, the correct option is, [tex]2F^-\rightarrow F_2+2e^-[/tex]
What causes the surface ocean currents in the Northern Hemisphere to deflect to the right, and the currents in the Southern Hemisphere to deflect to the left?
Final answer:
The Coriolis effect, caused by Earth's rotation, deflects surface ocean currents to the right in the Northern Hemisphere and to the left in the Southern Hemisphere, influencing global current patterns and gyre circulation.
Explanation:
The deflection of surface ocean currents in different hemispheres is caused by the Coriolis effect. Earth's rotation makes objects like wind and water currents appear to curve from their initially straight paths. In the Northern Hemisphere, this results in currents deflecting to the right, and in the Southern Hemisphere, currents deflect to the left.
There are circular patterns in both hemispheres, called gyres, that are affected by this phenomenon. Currents within these gyres flow clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere. The Coriolis effect influences these gyres and is responsible for the direction of the currents.
Consider the reaction between hcl and o2: 4hcl(g)+o2(g)→2h2o(l)+2cl2(g) when 63.1 g of hcl are allowed to react with 17.2 g of o2, 59.6 g of cl2 are collected.
The chemistry question involves a reaction of HCl and O2 to form H2O and Cl2. This involves principles of stoichiometry and energy dynamics, as well as the concept of limiting reactants.
Explanation:The reaction being described here is a chemical reaction where hydrochloric acid (HCl) and oxygen (O2) react to form water (H2O) and chlorine gas (Cl2). Because 59.6g of Cl2 are formed when 63.1g of HCl reacts with 17.2g of O2, this reaction demonstrates the concept of stoichiometry, where the amount of reactants determines the amount of product formed. We can also talk about the energy changes during this reaction. For example, when H-Cl bonds are formed, energy is released. Therefore this is also an exothermic reaction.
Further, it looks like this situation involves a limiting reactant, since there seems to be excess HCl or O2 left over after the reaction is complete. This is because the ratios of the reactants are important in determining how much product is produced. Here, it seems either HCl or O2 was in excess and hence remained unreacted at the end of the reaction.
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HCl is the limiting reactant. The theoretical yield of Cl₂ is 61.37 g, and the percent yield is 75.1%.
To determine the limiting reactant, theoretical yield, and percent yield for the reaction between HCl and O₂, follow these steps:
Step A: Determine the Limiting ReactantThe balanced reaction is:
4 HCl(g) + O₂(g) → 2 H₂O(l) + 2 Cl₂(g)
First, calculate the moles of HCl and O2:
63.1 g HCl × (1 mol HCl / 36.46 g HCl) ≈ 1.73 mol HClUsing the stoichiometric ratio from the balanced equation:
0.5375 mol O₂ × (4 mol HCl / 1 mol O₂) = 2.15 mol HClSince only 1.73 mol of HCl are available, HCl is the limiting reactant. Hence, HCl is the limiting reactant.
Step B: Determine the Theoretical Yield of Cl₂From the balanced equation, 4 mol HCl produces 2 mol Cl₂. Therefore:
1.73 mol HCl × (2 mol Cl₂ / 4 mol HCl) = 0.865 mol Cl₂Convert moles of Cl₂ to grams:
0.865 mol Cl₂ × 70.90 g Cl₂ / 1 mol Cl₂ ≈ 61.37 g Cl₂The theoretical yield of Cl₂ is 61.37 g.
Step C: Determine the Percent YieldThe percent yield is given by:
Percent yield = (Actual yield / Theoretical yield) × 100The percent yield of Cl₂ is 75.1%
Complete Question.
Consider the reaction between HCl and O2: 4HCl(g)+O2(g)→2H2O(l)+2Cl2(g) When 63.1 g of HCl are allowed to react with 17.2 g of O2, 46.1 g of Cl2 are collected.
A. Determine the limiting reactant for the reaction.
Express your answer as a chemical formula.
B. Determine the theoretical yield of Cl2 for the reaction.
C. Determine the percent yield for the reaction.
What force of attraction holds the electron in the hydrogen atom?
The electromagnetic force or Coulomb force is the primary force of attraction that holds the electron in the hydrogen atom. The relatively massive proton at the atom's center, and the less massive electron orbiting around it, interact due to their opposite charges, creating an electromagnetic attraction. Additionally, the orbiting electron generates a magnetic field, which contributes to the atom's interaction with external magnetic fields.
Explanation:The force of attraction that holds the electron in a hydrogen atom is the electromagnetic force, also known as the Coulomb force. This force arises due to the interaction between the positively charged proton and the negatively charged electron. It is this attraction that keeps the electron in orbit around the nucleus of the atom, similar to the gravitational pull of the Earth on the Moon.
In Bohr's model of the hydrogen atom, the electron moves in a perfectly circular orbit around the proton due to this attraction. Although this is a simplified model, it illustrates the primary force keeping the electron bound to the atom. The fact that the proton is around 1800 times more massive than the electron ensures that the proton moves very little in response to the force applied by the electron.
In addition, the atom possesses a magnetic field due to the movement of the electron in its orbit. This magnetic field also plays a decisive role in the interactions of the hydrogen atom with external magnetic fields.
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An organic compound in which a carbonyl group is bonded to two different carbon atoms is a(n) amide. aldehyde. ketone. ester.
Answer: ketone
Explanation:
Functional groups are specific group of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules.
1. Amides have functional group [tex]-O=C-NH_2[/tex].
Example: Ethanamide with molecular formula [tex]CH_3CONH_2[/tex]
2. Aldehydes have functional group [tex]-O=CH[/tex].
Example: Ethanal with molecular formula [tex]CH_3CHO[/tex]
3. Ketones have functional group [tex]-C=O[/tex].
Example: Propanone with molecular formula [tex]CH_3COCH_3[/tex]
4. Esters have functional group [tex]-O=C-OR[/tex].
Example: methyl ethanoate with molecular formula [tex]CH_3COOCH_3[/tex]