$$1 \text{ calorie (cal)} = 4.184 \text{ J}$$

$$1 \text{ calorie (cal)} = 4164 \text{ J}$$

Question 1

Which of the following best describes the difference between potential energy and kinetic energy in the context of thermochemistry?

Accepted Answer

Potential energy is the energy due to position or composition, while kinetic energy is the energy due to motion.

Question 2

A chemistry textbook is sitting on a table. Which type of energy does it primarily possess?

Accepted Answer

Potential energy

Question 3

Which of the following is an example of thermal energy?

Accepted Answer

The warmth coming from a campfire

Question 4

What is the SI unit for energy?

Accepted Answer

Joule

Question 5

How many joules are in 1 kilowatt-hour (kWh)?

Accepted Answer

$$3.6 	imes 10^6$

Question 6

A refrigerator uses 780 kWh of electrical energy per year. How many joules of energy does it use in one year?

Accepted Answer

$$2.81 	imes 10^9$ J

Question 7

Which of the following statements deals with potential energy with nonchemical energy associated?

Accepted Answer

Our chemistry book sitting on a table counter near the trashcan weighing 1.2 N at a height of 1.2 m.

Question 8

Which energy conversion factor is correct for converting calories to joules?

Accepted Answer

$$1 	ext{ calorie (cal)} = 4.184 	ext{ J}$$

Question 9

Which of the following is an example of chemical energy?

Accepted Answer

A battery storing charge

Question 10

If a process releases energy as heat, what type of energy conversion is occurring?

Accepted Answer

Chemical energy to thermal energy

Question 11

A student heats 100 g of water from 25°C to 75°C. If the specific heat of water is $$4.184 	ext{ J/g} \cdot 	ext{°C}$$, how much energy is required?

Accepted Answer

$$20,920 	ext{ J}$$

Question 12

Which of the following best describes the role of James Joule in the study of energy?

Accepted Answer

He defined the joule as the SI unit of energy.

Question 13

Which of the following is NOT a correct energy conversion factor?

Accepted Answer

$$1 	ext{ calorie (cal)} = 4164 	ext{ J}$$

Question 14

A car traveling at 51.0 m/s with a mass of 1250 kg has which type of energy?

Accepted Answer

Kinetic energy

Question 15

Which of the following is the correct definition of thermochemistry?

Accepted Answer

The study of matter and energy associated with chemical reactions or physical changes.

Question 16

If a chunk of coal is burned in a furnace, which type of energy transformation occurs?

Accepted Answer

Chemical energy to thermal energy

Question 17

Which of the following is an example of kinetic energy?

Accepted Answer

A moving bicycle

Question 18

A 1 Calorie (Cal) is equivalent to how many joules?

Accepted Answer

$$4164 	ext{ J}$$

Question 19

Which of the following best describes the relationship between energy and work?

Accepted Answer

Energy is the capacity to do work or produce heat.

Question 20

A student wants to convert 500 calories (cal) to joules. Which calculation should they use?

Accepted Answer

$$500 	imes 4.184$$

Thermochemistry and Energy in GOB Chemistry

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