Quiz about Chemistry: Thermochemistry Review 2024/25

Question 1

What is thermochemistry?

Accepted Answer

The study of energy changes in chemical reactions and changes of state

Answer

The study of acids and bases

Answer

The study of atomic structure

Answer

The study of matter at low temperatures

Question 2

Which direction does heat flow naturally?

Accepted Answer

From warmer objects to cooler objects

Answer

From cooler objects to warmer objects

Answer

In a random direction

Answer

It does not flow without external force

Question 3

An exothermic reaction releases heat because:

Accepted Answer

More energy is released when new bonds form than it takes to break the initial bonds

Answer

It absorbs energy from the surroundings

Answer

It stores energy in chemical bonds

Answer

It requires energy to proceed

Question 4

Which of the following is an example of an exothermic reaction?

Accepted Answer

Burning a match

Answer

Photosynthesis

Answer

Melting ice

Answer

Boiling water

Question 5

What is the unit of heat energy in the International System of Units (SI)?

Accepted Answer

Joule

Answer

Calorie

Answer

Kelvin

Answer

Gram

Question 6

The specific heat of water is high because:

Accepted Answer

It takes a lot of energy to change its temperature

Answer

It changes temperature quickly

Answer

It is an excellent conductor of heat

Answer

Its molecules are arranged randomly

Question 7

The amount of energy (q) required to change solid ice to liquid water is _______the amount needed to change liquid water to water vapor

Accepted Answer

Less than

Answer

Greater than

Answer

Equal to

Answer

None of the above

Question 8

Which of the following terms describes stored energy?

Accepted Answer

Potential Energy

Answer

Kinetic Energy

Answer

Thermal Energy

Answer

Nuclear Energy

Question 9

Energy due to motion is called:

Accepted Answer

Kinetic energy

Answer

Potential energy

Answer

Chemical energy

Answer

Bond Energy

Question 10

The energy stored in chemical bonds is referred to as:

Accepted Answer

Chemical Potential Energy

Answer

Thermal Energy

Answer

Kinetic Energy

Answer

Electrical Energy

Question 11

According to the Law of Conservation of Energy, energy:

Accepted Answer

Cannot be created or destroyed

Answer

Can be created

Answer

Can be destroyed

Answer

Always decreases over time

Question 12

What is the heat capacity of an object dependent on?

Accepted Answer

Mass and chemical composition

Answer

Only the mass

Answer

Only the volume

Answer

Only the temperature

Question 13

The heat capacity of water (l) is

Accepted Answer

High

Answer

Low

Answer

Variable

Answer

Zero

Question 14

When heat is absorbed from the surroundings, the reaction is:

Accepted Answer

Endothermic

Answer

Neutral

Answer

Reversible

Answer

Exothermic

Question 15

When heat is released to the surroundings, the reaction is:

Accepted Answer

Exothermic

Answer

Neutral

Answer

Reversible

Answer

Endothermic

Question 16

Heat flow is measured in:

Accepted Answer

Calories and Joules

Answer

Calories Only

Answer

Joules only

Answer

Kelvin

Question 17

Which of the following is the SI unit for measuring heat?

Accepted Answer

Joule

Answer

Watt

Answer

Kelvin

Answer

Calorie

Question 18

In calorimetry, the water in the calorimeter is considered:

Accepted Answer

The surroundings

Answer

The system

Answer

The reactant

Answer

The control

Question 19

The system in calorimetry refers to:

Accepted Answer

The reactants or substances under study

Answer

The water

Answer

The surroundings

Answer

The entire set up

Question 20

A calorimeter prevents:

Accepted Answer

Heat exchange between the system and surroundings

Answer

Chemical reactions

Answer

Temperature changes

Answer

Enthalpy changes

Question 21

Which of the following types of phase changes are considered endothermic?

Accepted Answer

Melting

Answer

Condensation

Answer

Freezing

Answer

Deposition

Question 22

Which of the following phase changes is an example of an exothermic change?

Accepted Answer

Freezing

Answer

Melting

Answer

Boiling

Answer

Sublimation

Question 23

Calorimetry is used to measure:

Accepted Answer

The heat transferred in a chemical reaction or physical process

Answer

The rate of reaction

Answer

The amount of product formed

Answer

The concentration of reactants

Question 24

Based on the graph provided, which of the following will change the temperature in less time (assuming the amount of heat in the surroundings are the same and pressure is constant)

Accepted Answer

Copper

Answer

Iron

Answer

Basalt

Answer

Dry Air

Question 25

Based on the graph provided, which of the following will change the temperature in a greater amount of time (assuming the amount of heat in the surroundings are the same and pressure is constant)

Accepted Answer

Ice

Answer

Dry Air

Answer

Iron

Answer

Copper

Question 26

Based on the graph provided, which of the following substances would require the greatest amount of energy to raise the temperature of the substance by 10oC, assuming pressure is constant.

Accepted Answer

Dry Air

Answer

Basalt

Answer

Copper

Answer

Granite

Question 27

Based on the image, which of the following will have the greatest intermolecular forces?

Accepted Answer

Solid

Answer

Liquid

Answer

Gas

Answer

Nonsense...All have the same amount of intermolecular forces

Question 28

When a substance changes from a solid to a liquid, it:

Accepted Answer

Absorbs heat

Answer

Releases heat

Answer

Remains at a constant temperature

Answer

Loses kinetic energy

Question 29

Which term describes the heat content of a system at constant pressure?

Accepted Answer

Enthalpy

Answer

Entropy

Answer

Temperature

Answer

Energy

Question 30

What does the change in entropy of a system measure?

Accepted Answer

The disorder or randomness in the system

Answer

The total energy absorbed by the system

Answer

The heat released by the system

Answer

The work done by the system

Question 31

If q is positive in a reaction, this indicates that:

Accepted Answer

The reaction absorbed heat

Answer

The reaction released heat

Answer

Heat was conserved

Answer

Heat was lost

Question 32

Which calorimeter is commonly used to measure food energy?

Accepted Answer

Bomb calorimeter

Answer

foam cup calorimeter

Answer

Water calorimeter

Answer

Systematic calorimeter

Question 33

The energy required to change 1 gram of a substance from liquid to gas is known as:

Accepted Answer

Enthalpy of vaporization

Answer

Enthalpy of fusion

Answer

Enthalpy of condensation

Answer

Specific heat

Question 34

Based on the diagram shown, a phase change from liquid to solid causes ___________________.

Accepted Answer

Energy to be released

Answer

Energy to be absorbed

Answer

Mass to increase

Answer

Mass to decrease

Question 35

If a snack is labeled with 100 Calories (kcal), it contains:

Accepted Answer

100,000 calories

Answer

10,000 calories

Answer

1,000 calories

Answer

100 joules

Question 36

What is the main purpose of calorimetry?

Accepted Answer

To measure the transfer of heat in chemical or physical processes

Answer

To measure bond energy

Answer

To determine melting points

Answer

To measure reaction rates

Question 37

If heat capacity depends on mass and composition, it is considered a(n):

Accepted Answer

Extensive property

Answer

Endothermic property

Answer

Variable Property

Answer

Intensive property

Question 38

$$O_2\left(g\right)\ +\ 2\ H_2\ \left(g\right)\ \rightarrow\ 2\ H_2O\ \left(g\right)\ +\ Energy$$

Accepted Answer

exothermic

Answer

endothermic

Question 39

In a chemical reaction, energy changes occur due to:

Accepted Answer

Bond breaking and bond formation

Answer

Changes in atomic mass

Answer

Temperature fluctuations

Answer

Changes in color

Question 40

How much heat (q) is needed to raise the temperature of 35 g of a substance by 45^oC, if the specific heat of the substance is 0.033 cal/g^oC?

Accepted Answer

52 cal

Answer

25 cal

Answer

54 cal

Answer

0.55 cal

Question 41

450 J of heat are added to a 10 gram sample of water. If the specific heat of water is 4.18 J/g^oC, what will the temperature change be in this reaction?

Accepted Answer

10.8 oC

Answer

15oC

Answer

1.08oC

Answer

5oC

Question 42

Convert 2.5 cal to J

Accepted Answer

10.46 J

Answer

14.46 J

Answer

0.5 J

Answer

5.0 cal

Question 43

Convert 1.5 J to cal

Accepted Answer

0.36 cal

Answer

0.85 cal

Answer

4.18 cal

Answer

12.3 J

Question 44

The enthalpy of vaporization is generally much higher than enthalpy of fusion because:

Accepted Answer

It requires more energy to separate molecules completely

Answer

It requires less energy

Answer

It requires the same amount of energy

Answer

It does not involve molecular separation

Question 45

How much heat (q) is required to raise the temperature of 25.0 g of Mercury by 52^oC? (Specific Heat of Mercury C=0.033 cal/g^oC)

Accepted Answer

43 cal

Answer

24 cal

Answer

58 cal

Answer

15 cal

Question 46

In an exothermic reaction, how does the heat flow?

Accepted Answer

From the system to the surroundings

Answer

From the surroundings to the system

Answer

Within the system only

Answer

No heat flow occurs

Question 47

Which term describes the heat content of a system?

Accepted Answer

Enthalpy

Answer

Entropy

Answer

Gibbs free energy

Answer

Internal energy

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