Q: A 225 Cal (nutritional Calorie) candy bar contains how many joules of energy? (Use $$1\ \text{Cal} = 1000\ \text{cal}$$ and $$1\ \text{cal} = 4.184\ \text{J})$$

$$9.41 \times 10^5$\ \text{J}$$

Q: Which of the following is the correct formula for converting Celsius to Kelvin?

$$K = ^\circ\text{C} + 273.15$$

Q: A metal sample with a mass of 10 g is heated, and its temperature increases by $$15\ ^\circ\text{C}$$ after absorbing $$67.5\ \text{J} of $$heat. What is the specific heat capacity of the metal? (Use $$q = mC\Delta T)$$

$$0.45\ \text{J/g}^\circ\text{C}$$

Q: Which of the following is NOT a correct unit conversion for energy?

$$1\ \text{cal} = 0.001\ \text{Cal}$$

Question 1

Which of the following best describes the law of conservation of energy?

Accepted Answer

Energy is neither created nor destroyed, only transformed or transferred.

Question 2

A 225 Cal (nutritional Calorie) candy bar contains how many joules of energy? (Use $$1\ 	ext{Cal} = 1000\ 	ext{cal}$$ and $$1\ 	ext{cal} = 4.184\ 	ext{J})$$

Accepted Answer

$$9.41 	imes 10^5$\ 	ext{J}$$

Question 3

Which of the following is an example of potential energy being converted to kinetic energy?

Accepted Answer

A rock falling from a cliff.

Question 4

Which of the following statements about exothermic and endothermic reactions is correct?

Accepted Answer

Exothermic reactions release energy, while endothermic reactions absorb energy.

Question 5

A 2.5 g sample of gallium is heated from $$25.0\ ^\circ	ext{C} to$$ $$29.9\ ^\circ	ext{C}. If $$the specific heat capacity of gallium is $$0.372\ 	ext{J/g}^\circ	ext{C}$$, how much heat is absorbed? (Use $$q = mC\Delta T)$$

Accepted Answer

$$4.6\ 	ext{J}$$

Question 6

Which of the following best explains why coastal regions tend to have milder climates than inland regions?

Accepted Answer

Water has a high specific heat capacity, so it absorbs and releases heat slowly.

Question 7

Which of the following is the correct formula for converting Celsius to Kelvin?

Accepted Answer

$$K = ^\circ	ext{C} + 273.15$$

Question 8

A metal sample with a mass of 10 g is heated, and its temperature increases by $$15\ ^\circ	ext{C}$$ after absorbing $$67.5\ 	ext{J} of $$heat. What is the specific heat capacity of the metal? (Use $$q = mC\Delta T)$$

Accepted Answer

$$0.45\ 	ext{J/g}^\circ	ext{C}$$

Question 9

Which of the following statements about temperature and heat is correct?

Accepted Answer

Heat is the transfer of thermal energy due to a temperature difference.

Question 10

Which of the following is NOT a correct unit conversion for energy?

Accepted Answer

$$1\ 	ext{cal} = 0.001\ 	ext{Cal}$$

Question 11

A chemical reaction in a hand warmer releases heat to your hands. This reaction is:

Accepted Answer

Exothermic

Question 12

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

Accepted Answer

Kinetic energy is energy of motion, while potential energy is stored due to position or composition.

Question 13

A sample of water is heated from $$20.0\ ^\circ	ext{C} to$$ $$30.0\ ^\circ	ext{C}. If $$the mass of water is 50 g and the specific heat capacity is $$4.184\ 	ext{J/g}^\circ	ext{C}$$, how much heat is absorbed?

Accepted Answer

$$2092\ 	ext{J}$$

Question 14

Which temperature scale does NOT use the degree symbol?

Accepted Answer

Kelvin

Question 15

Which of the following is a correct statement about the relationship between temperature and the motion of atoms and molecules?

Accepted Answer

As temperature increases, the random motion of atoms and molecules increases.

Question 16

A chemical reaction absorbs energy from its surroundings. Which of the following is true?

Accepted Answer

The products have higher potential energy than the reactants.

Question 17

Which of the following best explains why TNT is explosive?

Accepted Answer

TNT has a high potential energy and tends to undergo rapid chemical changes that lower its potential energy.

Question 18

Which of the following is the correct formula for converting Fahrenheit to Celsius?

Accepted Answer

$$^\circ	ext{C} = (^\circ	ext{F} - 32) / 1.8$$

Question 19

Which of the following is a real-life example of an endothermic process?

Accepted Answer

Melting ice in a drink.

Chapter 3: Matter and Energy – Structured Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards