Question 1

Which of the following best describes the arrangement and movement of particles in a solid, as shown in the first image (Neon at 14 K)?

Accepted Answer

Particles are closely packed in an ordered arrangement and vibrate in place.

Question 2

Which of the following is a physical property of gold, as seen in the image of gold bars?

Accepted Answer

Density of $$19.3 \ \mathrm{g/cm^3$}$$

Question 3

When water is boiled, as shown in the boiling water image, what type of change is occurring?

Accepted Answer

A physical change, because the state changes but the chemical identity remains the same

Question 4

Which of the following is a sign of a chemical change, as seen in the image of the beaker with bubbles forming?

Accepted Answer

Formation of a gas (bubbles) during a reaction

Question 5

The green color of the Statue of Liberty is due to the formation of a new substance on its surface. What type of change is this?

Accepted Answer

Chemical change

Question 6

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A compound is made of two or more elements chemically bonded, while a mixture is a physical blend of substances.

Question 7

If you burn 12.0 g of carbon in 32.0 g of oxygen gas, how much carbon dioxide will you produce, according to the law of conservation of mass?

Accepted Answer

$$44.0 \ \mathrm{g}$$

Question 8

Which of the following is an example of an exothermic process?

Accepted Answer

Freezing water

Question 9

A car burns methane ($$\mathrm{CH_4$}) in $$oxygen to produce carbon dioxide and water. What type of energy is stored in methane before combustion?

Accepted Answer

Chemical energy

Question 10

Which of the following equations is used to calculate the amount of heat energy transferred when a substance changes temperature?

Accepted Answer

$$q = s m \Delta T$$

Question 11

If 225 g of water cools from $$60^\circ \mathrm{C} to$$ $$20^\circ \mathrm{C}$$, what is the value of $$\Delta T$$?

Accepted Answer

$$\Delta T = -40^\circ \mathrm{C}$$

Question 12

Which of the following statements about energy is correct?

Accepted Answer

Energy is transformed from one form to another, but the total amount remains constant.

Question 13

Which temperature scale has its zero point at absolute zero, the lack of molecular motion?

Accepted Answer

Kelvin

Question 14

Convert $$21.5^\circ \mathrm{C} to $$Kelvin using the correct formula.

Accepted Answer

$$K = 21.5 + 273.15 = 294.65 \ \mathrm{K}$$

Question 15

Which of the following best explains why a large cup of coffee at $$80^\circ \mathrm{C}$$ contains more heat energy than a small cup at the same temperature?

Accepted Answer

The large cup has more mass, so it contains more total energy.

Question 16

Which of the following is NOT a sign of a chemical reaction?

Accepted Answer

Change in state from solid to liquid

Question 17

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

Accepted Answer

Heat is the flow of energy due to a temperature difference, while temperature is a measure of how hot or cold something is.

Question 18

Which of the following substances would require the most energy to raise its temperature by $$1^\circ \mathrm{C}$$, assuming equal masses?

Accepted Answer

Water

Question 19

Which of the following is an example of a homogeneous mixture?

Accepted Answer

Salt dissolved in water

Question 20

Which of the following best describes the process of sublimation?

Accepted Answer

A solid changing directly to a gas

Matter and Energy: States, Properties, Changes, and Energy in Chemistry

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