Quiz about K and E, reactions, Keq Test review

Question 1

Which has higher entropy?

A. A small pool of water sits in an enclosed glass chamber.

B. An enclosed glass chamber is filled with water vapor.

Accepted Answer

B

Answer

A

Question 2

Entropy increases from solid, liquid to gas. Why?

Accepted Answer

Molecular disorder increases

Answer

Molecular randomness decreases

Answer

Molecules are more energetic

Answer

Molecules are more reactive

Question 3

Which of the following correctly describes the entropy changes of the water molecules and the universe when a sample of water freezes?

Accepted Answer

B

Answer

A

Answer

C

Answer

D

Question 4

Which statement is true about the ENTROPY?

Accepted Answer

Entropy refers to DISORDER, the unusable energy that escapes a system.

Answer

Entropy refers to the balance of temperature among two or more systems.

Answer

Entropy refers to the average kinetic energy of the molecules.

Answer

Entropy refers to the inability to destroy or create energy.

Question 5

Which state of H₂O has the greatest entropy?

Accepted Answer

Vapor

Answer

Ice

Answer

Water

Question 6

At what time (in seconds) is equilibrium established?

Accepted Answer

5 seconds

Answer

0 seconds

Answer

1 second

Answer

10 seconds

Question 7

For the reaction...
SO₂ + O₂ <=> SO₃
If the concentration of SO₂is increased, the equilibrium position of the reaction will shift ___________.

Accepted Answer

to the right

Answer

to the left

Answer

to the left and right

Answer

neither left nor right

Question 8

For the reaction...
N₂ + O₂ <=> 2NO
If O₂ is removed, the concentration of N₂ will _______.

Accepted Answer

increase

Answer

decrease

Answer

remain the same

Answer

double

Question 9

What are [A] and [B]?

Accepted Answer

concentration of reactants

Answer

concentration of products

Answer

energy of reactants

Answer

energy of products

Question 10

Which of the following is NOT true at equilibrium?

Accepted Answer

The concentration of the reactants is equal to the concentration of the products.

Answer

The forward and reverse reactions proceed at the same rate.

Answer

The concentrations of reactants and products do not change.

Answer

The forward and reverse reactions continue to occur.

Question 11

For the reaction: 2NH_3(g) --> N_2(g) + 3H_2(g)

Accepted Answer

Entropy is increasing in the forward direction

Answer

Entropy is decreasing in the forward direction

Question 12

Entropy increases from solid, liquid to gas. Why?

Accepted Answer

Molecular disorder increases

Answer

Molecular randomness decreases

Answer

Molecules are more energetic

Answer

Molecules are more reactive

Question 13

As a system becomes more disordered, entropy

Accepted Answer

increases

Answer

remains the same

Answer

decreases

Answer

cannot be determined

Question 14

Entropy is a measure of

Accepted Answer

the disorder/randomness of a system

Answer

heat energy

Answer

temperature

Question 15

Which phase of matter has the greatest motion and least orderly arrangement?

Accepted Answer

gas

Answer

solid

Answer

liquid

Question 16

In an exothermic reaction, heat is ...

Accepted Answer

given out

Answer

taken in

Question 17

In an endothermic reaction, heat is

Accepted Answer

taken in

Answer

given out

Question 18

A substance that increases speed of chemical reaction without being being changed is called:

Accepted Answer

Catalyst

Answer

Acid

Answer

Base

Answer

pressure

Question 19

Activation energy is required to start a chemical reaction. What is activation energy?

Accepted Answer

The minimum amount of energy needed for a reaction to potentially occur

Answer

The energy needed for a reaction to occur

Answer

The energy added by a catalyst

Answer

The energy possessed by the products

Question 20

Increasing the concentration increases the speed of reaction by

Accepted Answer

increasing collisions

Answer

lowering activation energy

Answer

speeding up the reactants

Answer

exposing more reactant

Question 21

Define chemical equilibrium.

Accepted Answer

The rate of a forward reaction is equal to the rate of the reverse reaction.

Answer

A reaction is reversible.

Answer

The concentration of the reactants is equal to the concentration of the products.

Answer

The reaction stops and no further change in concentration occurs.

Question 22

Some chemical reactions require a substance called a catalyst. The main purpose of a catalyst is

Accepted Answer

To speed up the reaction

Answer

To warm up the reaction

Answer

To create more reactants

Answer

To stop the reaction

Question 23

Changes in pressure will only affect substances that are in the __________ state.

Accepted Answer

gaseous

Answer

liquid

Answer

solid

Question 24

The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?

Accepted Answer

Red, because the activation energy is larger

Answer

Blue, because the activation energy is lower

Answer

both reaction progress at the same rate

Question 25

Located on the left side of the reaction

Accepted Answer

reactants

Answer

products

Question 26

Which of the following is NOT true at equilibrium?

Accepted Answer

The concentration of the reactants is equal to the concentration of the products.

Answer

The forward and reverse reactions proceed at the same rate.

Answer

The concentrations of reactants and products do not change.

Answer

The forward and reverse reactions continue to occur.

Question 27

For the reaction...
SO₂ + O₂ <=> SO₃If the equilibrium position shifts to the right, the concentration of O₂ will ___________.

Accepted Answer

decrease

Answer

increase

Answer

remain the same

Answer

double

Question 28

Which of the following would be most likely to result in a reduction in the rate of a chemical reaction?

Accepted Answer

warming an exothermic reaction

Answer

lowering the activation energy for a reaction

Answer

stirring a solid and liquid reactant

Answer

crushing a solid reactant

Question 29

Is the reaction in the diagram endothermic or exothermic?

Accepted Answer

exothermic

Answer

endothermic

Question 30

A value of K_eq greater than 1 means ________.

Accepted Answer

products are favored over reactants

Answer

reaction has not yet come to completion

Answer

reactants are favored over products

Answer

the reaction is not in equilibrium

Question 31

If Keq is < 1, then there are more _____ at equilibrium

Accepted Answer

reactants

Answer

gases

Answer

liquids

Answer

products

Question 32

Which statement correctly describes this reaction?

Accepted Answer

It is exothermic and energy is released

Answer

It is endothermic and energy is absorbed.

Answer

It is endothermic and energy is released.

Answer

It is exothermic and energy is absorbed.

Question 33

Which numbered interval will change with the addition of a catalyst to the system?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 34

What is the difference between the potential energy of the reactants and the potential energy of the products?

Accepted Answer

20. kcal

Answer

40. kcal

Answer

60. kcal

Answer

80. kcal

Question 35

Which letter in the diagram represents the heat of reaction?

Accepted Answer

B

Answer

A

Answer

C

Answer

D

Question 36

Which reaction would have the lowest activation energy?

Accepted Answer

the forward catalyzed reaction

Answer

the forward uncatalyzed reaction

Answer

the reverse catalyzed reaction

Answer

the reverse uncatalyzed reaction

Question 37

In the potential energy diagram above, which arrow represents the potential energy of the activated complex?

Accepted Answer

C

Answer

A

Answer

B

Answer

D

Question 38

What is the activation energy for the forward reaction?

Accepted Answer

60 kcal

Answer

80 kcal

Answer

40 kcal

Answer

20 kcal

Question 39

In order for a chemical reaction to occur, there must always be

Accepted Answer

an effective collision between reacting particles

Answer

a bond that breaks in a reactant particle

Answer

reacting particles with a high charge

Answer

reacting particles with high kinetic energy

Question 40

For a chemical reaction, the difference between the potential energy of the products and the potential energy of the reactants is equal to the

Accepted Answer

heat of reaction

Answer

heat of fusion

Answer

activation energy of the forward reaction

Answer

activation energy of the reverse reaction

Question 41

Which conditions will increase the rate of a chemical reaction?

Accepted Answer

increased temperature and increased concentration of reactants

Answer

decreased temperature and decreased concentration of reactants

Answer

decreased temperature and increased concentration of reactants

Answer

increased temperature and decreased concentration of reactants

Question 42

What will change when a catalyst is added to a chemical reaction?

Accepted Answer

activation energy

Answer

heat of reaction

Answer

potential energy of the reactants

Answer

potential energy of the products

Question 43

The energy needed to start a chemical reaction is called

Accepted Answer

activation energy

Answer

potential energy

Answer

kinetic energy

Answer

ionization energy

Question 44

Which arrow represents the heat of reaction?

Accepted Answer

C

Answer

A

Answer

B

Answer

D

Question 45

Which letter represents the activation energy for the reverse reaction?

Accepted Answer

B

Answer

A

Answer

C

Answer

D

Question 46

Which arrow represents the part of the reaction most likely to be changed by the addition of a catalyst?

Accepted Answer

B

Answer

A

Answer

C

Answer

D

Question 47

If each interval on the axis labeled "Potential Energy (kj/ mol)" represents 10. kj/Imol, what is the heat of reaction?

Accepted Answer

+30. kJ/mol

Answer

+60. kJ/mol

Answer

+20. kJ/mol

Answer

+40. kJ/mol

Question 48

What does interval B represent?

Accepted Answer

activation energy

Answer

potential energy of the reactants

Answer

potential energy of the products

Answer

activated complex

Question 49

The potential energy diagram shown above represents the reaction A + B --> AB. Which statement correctly describes this reaction?

Accepted Answer

It is exothermic and energy is released.

Answer

It is endothermic and energy is absorbed.

Answer

It is endothermic and energy is released.

Answer

It is exothermic and energy is absorbed.

Question 50

Endothermic or exothermic reaction?

Accepted Answer

exothermic

Answer

Endothermic

Question 51

Which letter shows the heat change?

Accepted Answer

E

Answer

A

Answer

B

Answer

C

Answer

D

Question 52

Which letter represents the products?

Accepted Answer

D

Answer

A

Answer

B

Answer

C

Answer

E

Question 53

What is the Heat of Reaction $$\Delta H$$ for this reaction?

Accepted Answer

-200 KJ

Answer

200 KJ

Answer

400 KJ

Answer

-300 KJ

Question 54

What does interval G represent?

Accepted Answer

potential energy of the products

Answer

potential energy of the reactants

Answer

activation energy

Answer

activated complex

Question 55

Which statement correctly describes this reaction?

Accepted Answer

It is exothermic and energy is released

Answer

It is endothermic and energy is absorbed.

Answer

It is endothermic and energy is released.

Answer

It is exothermic and energy is absorbed.

Question 56

According to Table I, which equation represents a change resulting in the greatest quantity of energy released?

Accepted Answer

N₂(g) + 3H₂(g) --> 2NH₃(g)

Answer

2C(s) + 3H₂(g) --> C₂H₆(g)

Answer

2C(s) + 2H₂(g) --> C₂H₄(g)

Answer

N₂(g) + O₂(g) --> 2NO(g)

Question 57

Solve for the change in enthalpy ( $$\Delta H$$ ). Determine whether the reaction is exothermic or endothermic.

Accepted Answer

15 kJ, endothermic

Answer

-15 kJ, exothermic

Answer

40 kJ, endothermic

Answer

-40kJ, exothermic

Question 58

Is this equation endothermic or exothermic?

Accepted Answer

endothermic

Answer

exothermic

Question 59

Is this reaction endothermic or exothermic?

Accepted Answer

exothermic

Answer

endothermic

Question 60

Which represents a decrease in entropy?

Accepted Answer

condensation of steam on cold glass

Answer

sublimation of CO₂

Answer

boiling water

Answer

NaCl dissolving in water

Question 61

Systems in nature tend to undergo changes toward

Accepted Answer

lower energy and more disorder

Answer

lower energy and less disorder

Answer

higher energy and less disorder

Answer

higher energy and more disorder

Question 62

H₂+ Br₂+ 72.8 kJ--> 2 HBr

Accepted Answer

Endothermic

Answer

Exothermic

Question 63

The potential energy diagram of a reaction is shown. Which statement below is correct relating to this reaction?

Accepted Answer

#2 represents the enthalpy change for this endothermic reaction.

Answer

#1 represents the enthalpy change for this exothermic reaction.

Answer

#3 represents the enthalpy change for this endothermic reaction.

Answer

#4 represents the enthalpy change for this exothermic reaction.

Question 64

4Si + S₈ --> 2Si₂S₄

_{What type of reaction is this?}

Accepted Answer

Synthesis

Answer

Decomposition

Answer

Single displacement

Answer

Double displacement

K and E, reactions, Keq Test review

101 questions

Which has higher entropy?
A. A small pool of water sits in an enclosed glass chamber.
B. An enclosed glass chamber is filled with water vapor.

Entropy increases from solid, liquid to gas. Why?

Which of the following correctly describes the entropy changes of the water molecules and the universe when a sample of water freezes?

Which statement is true about the ENTROPY?

Which state of H₂O has the greatest entropy?

At what time (in seconds) is equilibrium established?

For the reaction...
SO₂ + O₂ <=> SO₃
If the concentration of SO₂is increased, the equilibrium position of the reaction will shift ___________.

For the reaction...
N₂ + O₂ <=> 2NO
If O₂ is removed, the concentration of N₂ will _______.

For the reaction...
N₂ + O₂ <=> 2NO: Δ H = +182 kJ mol^-1.
If the temperature is increased the equilibrium position will shift _______.

What are [A] and [B]?

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K and E, reactions, Keq Test review

101 questions

Which has higher entropy?A. A small pool of water sits in an enclosed glass chamber.B. An enclosed glass chamber is filled with water vapor.

Entropy increases from solid, liquid to gas. Why?

Which of the following correctly describes the entropy changes of the water molecules and the universe when a sample of water freezes?

Which statement is true about the ENTROPY?

Which state of H2O has the greatest entropy?

At what time (in seconds) is equilibrium established?

For the reaction...SO2 + O2 <=> SO3If the concentration of SO2 is increased, the equilibrium position of the reaction will shift ___________.

For the reaction...N2 + O2 <=> 2NOIf O2 is removed, the concentration of N2 will _______.

For the reaction...N2 + O2 <=> 2NO: Δ H = +182 kJ mol-1.If the temperature is increased the equilibrium position will shift _______.

What are [A] and [B]?

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science

Which has higher entropy?
A. A small pool of water sits in an enclosed glass chamber.
B. An enclosed glass chamber is filled with water vapor.

Which state of H₂O has the greatest entropy?

For the reaction...
SO₂ + O₂ <=> SO₃
If the concentration of SO₂is increased, the equilibrium position of the reaction will shift ___________.

For the reaction...
N₂ + O₂ <=> 2NO
If O₂ is removed, the concentration of N₂ will _______.

For the reaction...
N₂ + O₂ <=> 2NO: Δ H = +182 kJ mol^-1.
If the temperature is increased the equilibrium position will shift _______.