Question 1

Which of the following best describes a chemical change?

Accepted Answer

Burning gasoline in a car engine

Question 2

Which statement correctly distinguishes between a compound and a mixture?

Accepted Answer

A compound consists of two or more elements chemically bonded, while a mixture consists of substances physically combined.

Question 3

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

Accepted Answer

Photosynthesis in plants

Question 4

A student heats 100 g of water from $$20^\circ C to$$ $$80^\circ C. If $$the specific heat capacity of water is $$4.18 \ \mathrm{J/g\cdot ^\circ C}$$, how much heat energy is absorbed?

Accepted Answer

$$25,080 \ \mathrm{J}$$

Question 5

Which of the following best describes the particles in a solid?

Accepted Answer

They are close together and vibrate in fixed positions.

Question 6

Which of the following is a physical change?

Accepted Answer

Boiling of water

Question 7

A chemical reaction releases heat to its surroundings. Which term best describes this process?

Accepted Answer

Exothermic

Question 8

Which of the following statements about energy is correct according to the law of conservation of energy?

Accepted Answer

Energy cannot be created or destroyed, only transformed.

Question 9

Which of the following best describes the difference between a physical and a chemical property?

Accepted Answer

A chemical property describes how a substance reacts with other substances.

Question 10

A 50 g sample of a metal requires $$1,000 \ \mathrm{J} of $$heat to raise its temperature by $$20^\circ C. $$What is the specific heat capacity of the metal?

Accepted Answer

$$0.5 \ \mathrm{J/g\cdot ^\circ C}$$

Question 11

Which of the following scenarios involves a mixture?

Accepted Answer

Air in a classroom

Question 12

Which of the following is NOT a characteristic of liquids?

Accepted Answer

Definite shape

Question 13

A chemical reaction absorbs $$500 \ \mathrm{J} of $$heat from its surroundings. Which of the following best describes this reaction?

Accepted Answer

It is endothermic and absorbs energy.

Question 14

Which of the following best explains why water boiling is considered a physical change?

Accepted Answer

Only the state of water changes, not its chemical identity.

Question 15

Which of the following equations correctly represents the relationship for calculating heat energy?

Accepted Answer

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

Question 16

A student mixes two clear solutions and observes the formation of a solid precipitate. What type of change has occurred?

Accepted Answer

Chemical change

Question 17

Which of the following is an example of a compound?

Accepted Answer

Table sugar (C$$_{12}H$_{22}O$_{11})$$

Question 18

Which of the following best describes the energy change when natural gas is burned in a stove?

Accepted Answer

Exothermic; energy is released to the surroundings.

Question 19

Which of the following statements about mixtures is correct?

Accepted Answer

Mixtures can be separated by physical means.

Question 20

A 200 g sample of a substance is heated, and its temperature increases by $$10^\circ C. If $$the substance absorbs $$4,000 \ \mathrm{J} of $$heat, what is its specific heat capacity?

Accepted Answer

$$0.2 \ \mathrm{J/g\cdot ^\circ C}$$

States of Matter, Physical and Chemical Changes, and Energy in Chemistry

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