AnswersChemistry - SC3210 A-CRLab: Reaction Rate

Lab: Reaction Rate — Unit test Answers

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1
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Iron reacts with oxygen to form iron oxide (rust). Which best describes this statement?

A
Iron oxide is the liquid state of iron.
B
Iron oxide is the gaseous state of iron.
C
Iron oxide is formed by rearranging atoms.
D
Iron oxide is made up of only iron atoms.
2
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Equations can be balanced by using the half-reaction method. Which step should be completed first when using this method?

A
inserting the coefficients
B
balancing the half reactions
C
identifying the half reactions
D
finding the oxidation states of atoms
3

Consider the reaction below.H2(g) + CO2(g) H2O(g) + CO(g)At equilibrium at 600 K, the following are true. [CO2] = 9.5 x 10-4 M[H2] = 4.5 x 10-2 M[H2O] = 4.6 x 10-3 M[CO] = 4.6 x 10-3 MWhat is the value of the equilibrium constant for this reaction in correct scientific notation?

Question illustration
A
4.9 x 10-3
B
4.9 x 10-2
C
4.9 x 10-1
D
4.9 x 103
4

In which two types of reactions do opposite chemical changes occur?

A
double replacement and combustion
B
single replacement and double replacement
C
synthesis and decomposition
D
combustion and synthesis
5

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
A
0.0 mol/L·s
B
1.0 mol/L·s
C
2.0 mol/L·s
D
4.0 mol/L·s
6

How does an increase in reactant concentration affect the rate of reaction?

A
It leads to more frequent collisions, which increase reaction rate.
B
It leads to less frequent collisions, which increase reaction rate.
C
It leads to more frequent collisions, which decrease reaction rate.
D
It leads to less frequent collisions, which decrease reaction rate.
7

Chemists use activity series to determine whether which type of reaction will occur?

A
combustion
B
double replacement
C
decomposition
D
single replacement
8

Which statement best describes the use of catalytic converters in automobiles?

A
They decrease the rate of the reactions that produce harmful gases.
B
They oxidize hydrocarbons to form less toxic gases.
C
They combine the larger hydrocarbon molecules with smaller ones.
D
They increase reaction temperature for cleaner burning.
9

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.
10

Which of the following is a simple definition of reduction?

A
the loss of electrons
B
the gain of electrons
C
an agent that oxidizes something
D
an agent that reduces something
11

Consider the reaction that occurs when copper is added to nitric acid.Cu(s) + 4HNO3(aq) Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l)What is the reducing agent in this reaction?

Question illustration
A
Cu
B
NO3–
C
Cu(NO3)2
D
NO2
12

This formula equation is unbalanced.BaCl2(aq) + Na2CO3(aq) BaCO3(s) + NaCl(aq) Which coefficient should be placed in front of NaCl to balance this equation?

Question illustration
A
1
B
2
C
3
D
4
13

Consider the reaction below. Which half reaction correctly describes the oxidation that is taking place?

Question illustration
A
Z n (s) right arrow upper Z n superscript 2 plus (a q) plus e superscript minus.
Option A
B
Upper Z n (s) right arrow upper Z n superscript 2 plus (a q) plus 2 e superscript minus.
Option B
C
Upper C u superscript 2 plus (a q) plus 2 e superscript minus right arrow upper C u (s).
Option C
D
Upper C u superscript 2 plus (a q) plus e superscript minus right arrow upper C u (s).
Option D
14

Consider the reaction.At 298 K, the equilibrium concentration of O2 is 1.6 x 10-2 M, and the equilibrium concentration of O3 is 2.86 x 10-28 M. What is the equilibrium constant of the reaction at this temperature?

Question illustration
A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
15

An unbalanced chemical equation for the reaction of boron fluoride with lithium sulfite is shown below.BF3 + Li2SO3 B2(SO3)3 + LiFWhat is the coefficient of lithium fluoride in the balanced chemical reaction?

Question illustration
A
1
B
3
C
4
D
6
16

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.
17

Which substance loses electrons in a chemical reaction?

A
the one that is oxidized, which is the oxidizing agent
B
the one that is reduced, which is the reducing agent
C
the one that is oxidized, which is the reducing agent
D
the one that is reduced, which is the oxidizing agent
18

Which word equation shows lithium oxide being formed from the reaction between oxygen and lithium?

A
oxygen + lithium oxide lithium
Option A
B
lithium + oxygen lithium oxide
Option B
C
oxygen + lithium lithium + oxide
Option C
D
lithium oxide lithium + oxygen
Option D
19

The equation below shows a reaction that produces calcium carbonate.Ca(OH)2(s) + CO2(g) CaCO3(s) + H2O(l)Which describes a way to speed up the collisions between calcium hydroxide and carbon dioxide molecules to produce calcium carbonate faster?

Question illustration
A
Lower the temperature.
B
Use larger pieces of calcium hydroxide.
C
Lower the pressure.
D
Reduce the volume of the container.
20

Which best describes the reducing agent in the reaction below? Cl2(aq) + 2Br–(aq) 2Cl–(aq) + Br2(aq)

Question illustration
A
Bromine (Br) loses an electron, so it is the reducing agent.
B
Bromine (Br) gains an electron, so it is the reducing agent.
C
Chlorine (Cl) loses an electron, so it is the reducing agent.
D
Chlorine (Cl) gains an electron, so it is the reducing agent.

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