Q: A student calculates the heat required to raise the temperature of $$10.0\ \mathrm{g} of $$ethanol by $$15.0\ ^\circ\mathrm{C}. $$The specific heat of ethanol is $$2.44\ \mathrm{J}/\mathrm{g}\cdot\mathrm{K}. $$Which equation should the student use?

$$q = m \times c \times \Delta T$$

Question 1

Which of the following best describes a chemical property of a substance?

Accepted Answer

Ability to react with oxygen

Question 2

A student observes that when sugar dissolves in water, the process can be reversed by evaporating the water. Which type of change is this?

Accepted Answer

Physical change

Question 3

Which of the following is an example of a chemical change?

Accepted Answer

Iron rusting in moist air

Question 4

A student is asked to solve a problem involving the calculation of heat absorbed by a substance. Which of the following is the correct sequence of steps to follow?

Accepted Answer

Read, plan, calculate, check units

Question 5

Which of the following statements about energy is correct?

Accepted Answer

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

Question 6

What is the SI unit for energy?

Accepted Answer

Joule (J)

Question 7

A 50.0 g sample of water is heated from $$20.0\ ^\circ\mathrm{C} to$$ $$30.0\ ^\circ\mathrm{C}. $$The specific heat of water is $$4.18\ \mathrm{J}/\mathrm{g}\cdot\mathrm{K}. $$How much heat is absorbed by the water?

Accepted Answer

$$2090\ \mathrm{J}$$

Question 8

Which of the following best illustrates the Law of Conservation of Energy in a chemical reaction?

Accepted Answer

The total energy before and after the reaction remains constant.

Question 9

Which of the following is a source of energy in the real world?

Accepted Answer

Photosynthesis in plants

Question 10

A metal at $$100.0\ ^\circ\mathrm{C} is $$placed in $$100.0\ \mathrm{g} of $$water at $$20.0\ ^\circ\mathrm{C}. $$The final temperature of the system is $$25.0\ ^\circ\mathrm{C}. If $$the specific heat of water is $$4.18\ \mathrm{J}/\mathrm{g}\cdot\mathrm{K}$$, how much heat did the water absorb?

Accepted Answer

$$2090\ \mathrm{J}$$

Question 11

Which of the following is NOT a physical property?

Accepted Answer

Reactivity with acid

Question 12

Which process involves a chemical change?

Accepted Answer

Burning of natural gas

Question 13

A student calculates the heat required to raise the temperature of $$10.0\ \mathrm{g} of $$ethanol by $$15.0\ ^\circ\mathrm{C}. $$The specific heat of ethanol is $$2.44\ \mathrm{J}/\mathrm{g}\cdot\mathrm{K}. $$Which equation should the student use?

Accepted Answer

$$q = m 	imes c 	imes \Delta T$$

Question 14

Which of the following best describes kinetic energy?

Accepted Answer

Energy due to motion

Question 15

Which of the following scenarios demonstrates the conversion of potential energy to kinetic energy?

Accepted Answer

A compressed spring being released

Question 16

During a chemical reaction in a hand warmer, heat is released to the surroundings. Which term best describes this process?

Accepted Answer

Exothermic

Question 17

Which of the following is an example of energy flow in a chemical change?

Accepted Answer

Heat released when wood burns in a fireplace

Question 18

A student is asked to check their answer after solving a specific heat problem. Which of the following is the most important reason for checking units?

Accepted Answer

To confirm the calculation is dimensionally correct

Question 19

Which of the following statements about the Law of Conservation of Energy is true?

Accepted Answer

Energy is neither created nor destroyed, only transformed.

Question 20

Which of the following is a real-world example of energy transformation?

Accepted Answer

A solar panel converting sunlight into electricity

Properties of Substances, Physical and Chemical Changes, and Energy in Chemistry

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