AnswersIA-Chemistry A Survey of Chemistry AShifts in Equilibrium

Shifts in Equilibrium — Unit test Answers

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For the equation BaCl2 + Na2SO4 → BaSO4 + 2NaCl, how many chlorine atoms are on the reactants side and on the products side?

reactants: 1; products: 1
Option
reactants: 1; products: 2
Option
reactants: 2; products: 1
Option
reactants: 2; products: 2
Option
2
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In the hypothetical reaction below, substance A is consumed at a rate of 2.0 mol/L·s. If this reaction is at dynamic equilibrium, at what rate will substance B be consumed?A B

Question illustration
0.0 mol/L·s
Option
1.0 mol/L·s
Option
2.0 mol/L·s
Option
4.0 mol/L·s
Option
3

Which statement best describes balancing equations and the law of conservation of mass?

A
There are more atoms in the reactants than in the products, and the total mass is the same in the reactants and in the products.
B
The number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and in the products.
C
There are fewer atoms in the reactants than in the products, and the total mass is less in the reactants than in the products.
D
There are more atoms in the reactants than in the products, and the total mass is higher in the reactants than in the products.
4

Which best represents the reaction of calcium and zinc carbonate (ZnCO3) to form calcium carbonate (CaCO3) and zinc?

Ca → ZnCO3 + CaCO3 → Zn
Option
Ca + ZnCO3 → CaCO3 + Zn
Option
CaCO3 + Zn → Ca + ZnCO3
Option
CaCO3 + Zn + Ca → ZnCO3
Option
5

What are the coefficients for the reaction _Cl2O5 + _H2O → _HClO3 once it is balanced?

1, 1, 1
Option
1, 1, 2
Option
1, 2, 2
Option
2, 1, 1
Option
6

Consider the following chemical reaction of bromothymol blue indicator. It appears yellow in undissociated form and blue in its dissociated aqueous solution. HC2H3O2(aq) H+(aq) + C2H3O2–(aq)yellow blue What will be the color of the solution if a large amount of H2CO3 is added?

Question illustration
A
The solution will remain yellow.
B
The solution will turn blue.
C
The solution will turn pink.
D
The solution will turn green.
7

Shiloh wanted to observe the changes that occurred during an exothermic reaction. He monitored the changes and placed them in a chart. Which statement best describes his data?

Question illustration
A
The activation energy was reached at 10:45 a.m. Without the additional energy, the reaction would have stopped.
B
The activation energy was reached at 11:15 a.m. The previous change was the threshold point for a reaction.
C
The activation energy was reached at 10:15 a.m. The additional energy allowed for a lower activity level.
D
The activation energy was reached was 10:45 a.m. The additional energy did not affect the reaction.
8

Consider the chemical equation in equilibrium. A(g) + 2B(g) C(g) + D(g) + heat What will happen to the equilibrium of this reaction if the temperature is increased?

Question illustration
A
It will shift to the left because heat is released.
B
It will shift to the left because heat is absorbed.
C
It will shift to the right because heat is released.
D
It will shift to the right because heat is absorbed.
9

Which type of reaction is Mg + S → MgS?

polymerization
Option
synthesis
Option
replacement
Option
decomposition
Option
10

Lars is balancing equations with his study group. He is unsure about one equation because each member of the study group came up with a different answer. Which is the proper way to balance the equation Ca(OH)2 + H3PO4 → Ca3(PO4)2 + H2O?

A
Ca(OH)2 + H3PO4 → Ca3(PO4)2 + 6H2O
B
3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O
C
3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 3H2O
D
Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O
11

The first chart shows the effect of the normal breakdown of material from reactants to products. The second chart shows the same reaction but with an added modification.

Question illustration
A
Reaction A has an enzyme.
B
Reaction B has an enzyme.
C
Reaction A has an inhibitor.
D
Reaction B has an inhibitor.
12

Which element has fewer than four dots in its electron dot diagrams?

arsenic (As)
Option
sulfur (S)
Option
krypton (Kr)
Option
gallium (Ga)
Option
13

According to Le Chatelier’s principle, what happens when the concentration of a product is reduced in a chemical reaction that was in equilibrium?

A
The equilibrium shifts to the right to favor the formation of products.
B
The equilibrium shifts to the left to favor the formation of reactants.
C
The equilibrium shifts in the exothermic direction.
D
The equilibrium shifts in the endothermic direction.
14

Which represents an endothermic reaction?

wood burning in a fire
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splitting a gas molecule
Option
using a heat pack on an injury
Option
TNT exploding
Option
15

In the reaction C + O2 → CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be needed in the reaction?

A
18 g
B
54 g
C
72 g
D
90 g
16

If a chemical reaction does not reach its activation energy, which will most likely occur?

A
The chemical bonds will remain unchanged.
B
The chemical bonds will break.
C
The chemical bonds will have high kinetic energy.
D
The chemical bonds will already be broken.
17

Which statement best describes how dynamic equilibrium relates to a saturated solution of sodium chloride?

A
The concentration of the dissolved particles remains constant.
B
No more solid dissolves in a saturated solution.
C
Each second, the amount of solid sodium chloride that dissolves equals the amount of solid sodium chloride that recrystallizes.
D
Each second, solid sodium chloride dissolves and solid sodium chloride recrystallizes.
18

Ciara’s bike has rusted, which means that the iron in the metal changed to rust.

A
an energy formation
B
an exothermic reaction
C
a chemical reaction
D
a precipitate formation
19

According to Le Chatelier’s principle, a change in pressure affects the chemical equilibrium of the reaction system under what condition?

A
The reactants and the products are in the solid phase.
B
The reactants and the products are in the liquid phase.
C
Some of the reactants or the products are in the gaseous phase.
D
Some of the reactants or the products are solid, and some are liquid.
20

What else is produced during the replacement reaction of magnesium and hydrochloric acid?Mg + 2HCl H2 + ________

Question illustration
A
MgCl2
B
Mg2Cl2
C
Mg2Cl
D
MgCl

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