Question 1

Which of the following best describes a chemical property?

Accepted Answer

Iron reacts with oxygen to form rust.

Question 2

A student observes that when sugar dissolves in water, the process can be reversed by evaporating the water. This is an example of:

Accepted Answer

A physical change

Question 3

Which of the following statements about gases is correct?

Accepted Answer

The atoms or molecules are widely separated and move freely relative to one another.

Question 4

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

Accepted Answer

Oil and vinegar salad dressing

Question 5

A sample of matter has a definite volume but no definite shape. Which state of matter is it most likely to be?

Accepted Answer

Liquid

Question 6

Which of the following best describes an amorphous solid?

Accepted Answer

Atoms or molecules are not arranged in a long-range order.

Question 7

Which of the following is a chemical change?

Accepted Answer

Burning wood in a fireplace

Question 8

Which of the following is a pure substance?

Accepted Answer

Oxygen gas ($$O_2)$$

Question 9

A student is given a sample of an unknown substance. It is shiny, conducts electricity, and melts at $$1085^\circ C. $$Which type of property is the student primarily observing?

Accepted Answer

Physical properties

Question 10

Which of the following best explains why gases are compressible while solids are not?

Accepted Answer

Gases have atoms or molecules that are widely separated, allowing them to be pushed closer together.

Question 11

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

Accepted Answer

Salt dissolved in water

Question 12

Which of the following statements about elements and compounds is correct?

Accepted Answer

Compounds are made of two or more elements chemically combined in a fixed proportion.

Question 13

A student heats a blue solid and observes that it turns white and releases a gas. Which of the following best describes the process?

Accepted Answer

A chemical change, because a new substance and gas were formed.

Question 14

Which of the following is NOT a physical property?

Accepted Answer

Flammability

Question 15

Which of the following best describes a mixture?

Accepted Answer

A combination of two or more substances that are not chemically bonded.

Question 16

Which of the following is an example of a physical change that occurs in everyday life?

Accepted Answer

Melting ice to form water

Question 17

A sample of gold is hammered into a thin sheet. Which property of gold does this demonstrate?

Accepted Answer

Malleability

Question 18

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

Accepted Answer

A physical property can be observed without changing the substance's composition.

Question 19

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 20

Which of the following best explains why a compound can be separated into its elements only by chemical means?

Accepted Answer

The elements in a compound are chemically bonded together.

Introduction to Chemistry: Matter, Properties, and Changes

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