Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of atoms of two or more elements chemically united in fixed proportions.

Question 2

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

Accepted Answer

Melting ice to form liquid water.

Question 3

A sample of chlorine gas is described as yellowish-green, with a disagreeable odor, and is about 2.4 times heavier than air. Which of these is an example of an extensive property?

Accepted Answer

Its mass.

Question 4

Which separation technique would be most appropriate to separate a homogeneous mixture of salt dissolved in water?

Accepted Answer

Distillation

Question 5

Which of the following statements about elements is correct?

Accepted Answer

Elements are substances that cannot be decomposed into simpler substances.

Question 6

A student mixes sand and iron filings. Which method would best separate the two substances?

Accepted Answer

Using a magnet to attract the iron filings.

Question 7

Which of the following is a chemical property of chlorine?

Accepted Answer

It supports the combustion of certain other substances.

Question 8

Which of the following best describes kinetic energy?

Accepted Answer

The energy of motion, dependent on mass and velocity.

Question 9

Which of the following is a homogeneous mixture?

Accepted Answer

Air

Question 10

Which of the following is NOT a physical property?

Accepted Answer

Flammability

Question 11

A sample of water is heated from ice at $$0^\circ C to $$steam at $$100^\circ C. $$Which of the following statements is true?

Accepted Answer

The process involves only physical changes.

Question 12

Which of the following best describes a crystalline solid?

Accepted Answer

A solid with a regular, repeating three-dimensional pattern.

Question 13

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

Accepted Answer

Cement

Question 14

Which of the following is an intensive property?

Accepted Answer

Density

Question 15

Which of the following best describes potential energy?

Accepted Answer

Energy due to an object's position relative to other objects.

Question 16

Which of the following is a correct statement about mixtures?

Accepted Answer

The components of a mixture retain their distinct identities.

Question 17

Which of the following is a chemical change?

Accepted Answer

Copper reacting with nitric acid to form a blue solution and brown gas.

Question 18

Which of the following is the best example of a physical property used to identify a substance?

Accepted Answer

Boiling point

Question 19

Which of the following best describes the motion of particles in a gas?

Accepted Answer

Very free motion, particles are relatively far apart.

Question 20

Which of the following is a correct statement about the composition of the human body?

Accepted Answer

A small number of elements make up 90% of the human body by mass.

Introduction to Chemistry: Matter, Energy, and Measurement

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