Concept of Thermochemistry

Multiple Choice

What type of reaction is shown in the reaction pathway?

• endothermic reaction
• exothermic reaction

Multiple Choice

What type of reaction is shown in the picture?

• endothermic
• exothermic

Multiple Choice

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

• #1 represents the enthalpy change for this exothermic reaction.

• #2 represents the enthalpy change for this endothermic reaction.

• #3 represents the enthalpy change for this endothermic reaction.

• #4 represents the enthalpy change for this exothermic reaction.

Open Ended

Why is the study of thermochemistry important in understanding chemical and physical changes?

Multiple Choice

Which of the following factors does thermal energy in a sample depend on?

• Temperature and number of particles

• Volume and pressure

• Color and shape of particles

• Type of container

Multiple Choice

Which of the following best defines 'heat' in the context of thermal energy?

• The energy stored in an object

• The thermal energy transferred from an object of higher temperature to an object of lower temperature

• The temperature of an object

• The energy required to break chemical bonds

Open Ended

Compare the specific heat capacities of water and metals like copper and aluminum. What does this tell you about their ability to absorb heat?

Multiple Choice

In order to break bonds between atoms...

• energy is absorbed

• energy is released

• energy stays the same

• energy is cancelled

Multiple Choice

Which of the following statements about the sign of q is correct?

• q is positive if heat is released by the system, and negative if heat is absorbed.

• q is always positive.

• q is positive if heat is absorbed by the system, and negative if heat is released.

• q is always negative.

Multiple Choice

Ice is taken from a freezer and left in a room. The ice melts and eventually the water reaches room temperature.
Which energy transfers take place? 

• A
• B
• C
• D

Open Ended

Explain how conduction, convection, and radiation differ in the way they transfer heat. Provide an example of each method.

Multiple Select

Which of the following are methods of heat transfer?

• Conduction

• Convection

• Radiation

• Evaporation

Multiple Choice

What is the standard unit for temperature in thermochemistry?

• Celsius

• Fahrenheit

• Kelvin

• Joule

Open Ended

How does thermal energy relate to temperature and the number of particles in a sample?

Multiple Choice

Which statement best describes the Law of Conservation of Energy?

• Energy can be created or destroyed during energy conversions.

• The total amount of energy remains constant during energy conversions.

• Energy is only lost as heat during conversions.

• Energy can only be created, not destroyed.