Question 1

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

Accepted Answer

Copper reacts with oxygen to form copper oxide.

Question 2

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

Accepted Answer

Dissolving sugar in water.

Question 3

A student mixes two colorless solutions and observes the formation of a yellow solid. This observation is evidence of:

Accepted Answer

A chemical change, because a new substance formed.

Question 4

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

Accepted Answer

Compounds can be separated into their elements by chemical reactions.

Question 5

Which of the following is a pure substance?

Accepted Answer

Table sugar ($$\mathrm{C$$_{12}$$H_{22}O$$_{11}}$)

Question 6

Which of the following best describes a mixture?

Accepted Answer

A blend of two or more substances, each retaining its own properties.

Question 7

Which of the following is NOT a property of metals?

Accepted Answer

Poor conductor of heat

Question 8

Which element is a liquid at room temperature?

Accepted Answer

Bromine

Question 9

Which of the following best describes a molecule?

Accepted Answer

A group of two or more atoms held together by covalent bonds.

Question 10

Which of the following is a correct chemical formula for a compound?

Accepted Answer

$$\mathrm{H_2O}$$

Question 11

Which of the following best explains why water ($$\mathrm{H_2O}) is $$classified as a compound?

Accepted Answer

It is composed of two different elements chemically combined in a fixed ratio.

Question 12

Which of the following is a diatomic element in its natural state?

Accepted Answer

$$\mathrm{O_2$}$$

Question 13

A sample of matter is shiny, malleable, and conducts electricity. It is most likely:

Accepted Answer

A metal

Question 14

Which of the following best describes the difference between a macroscopic and microscopic view in chemistry?

Accepted Answer

Macroscopic refers to properties we can see; microscopic refers to the behavior of individual particles.

Question 15

Which of the following is a chemical change?

Accepted Answer

Burning of gasoline in a car engine.

Question 16

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically combined.

Question 17

Which of the following is a correct representation of a chemical reaction?

Accepted Answer

$$\mathrm{Na + Cl_2$ \rightarrow NaCl}$$

Question 18

Which of the following is a property of nonmetals?

Accepted Answer

Poor conductor of electricity

Question 19

Which of the following best describes the classification of salt water?

Accepted Answer

Homogeneous mixture

Question 20

Which of the following statements about the periodic table is correct?

Accepted Answer

Metals are typically found on the left side of the periodic table.

Chapter One: Matter and Life – Introduction to Chemistry, Matter, and the Elements

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