Q: Which of the following is a correct energy conversion factor?

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

Question 1

Which of the following best defines thermochemistry?

Accepted Answer

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

Question 2

What is the SI unit for energy, named after an English scientist?

Accepted Answer

Joule

Question 3

Which of the following is an example of potential energy?

Accepted Answer

A stretched bowstring

Question 4

A refrigerator uses 700 kWh of electrical energy per year. How many kilocalories of electricity does it use in a year? (Use $$1 	ext{ kWh} = 860 	ext{ kcal})$$

Accepted Answer

$$2.0 	imes 10^5$ kcal

Question 5

Which of the following statements describes a process that involves kinetic energy?

Accepted Answer

A ball rolling down a hill.

Question 6

Convert 500 calories to joules. (Use $$1 	ext{ cal} = 4.184 	ext{ J})$$

Accepted Answer

$$2092 	ext{ J}$$

Question 7

Which of the following is NOT a form of energy classified under the diagram provided?

Accepted Answer

Magnetic energy

Question 8

A car traveling at a velocity of 10 m/s with a mass of 1150 kg has how much kinetic energy? (Use $$KE = \frac{1}{2}mv^2$)

Accepted Answer

$$57,500 	ext{ J}$$

Question 9

Which of the following best describes the energy transformation in a hydroelectric dam?

Accepted Answer

Potential energy to kinetic energy to electrical energy

Question 10

If a 4 kg object is lifted 2 m above the ground, what is its potential energy? (Use $$PE = mgh$$, $$g = 9.8 	ext{ m/s}^2)$$

Accepted Answer

$$78.4 	ext{ J}$$

Question 11

Which of the following is a correct energy conversion factor?

Accepted Answer

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

Question 12

Which scenario best illustrates the conversion of chemical energy to thermal energy?

Accepted Answer

Burning wood in a fireplace.

Question 13

A toaster uses 1200 J of electrical energy to make toast. If all the energy is converted to heat, how many calories of heat are produced? (Use $$1 	ext{ cal} = 4.184 	ext{ J})$$

Accepted Answer

$$287 	ext{ cal}$$

Question 14

Which of the following is an example of energy being transferred as work?

Accepted Answer

A person lifting a box onto a shelf.

Question 15

Which of the following best describes the difference between heat and work?

Accepted Answer

Heat is energy transferred due to temperature difference; work is energy transferred by force moving an object.

Introduction to Energy in Chemistry: Thermochemistry and Energy Conversion

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