Answers

1 The amount of matter that a material has is its ___.

B mass

A

C

D

volume

density

composition

2 Lithium reacts with oxygen to produce lithium oxide. The product in this reaction is ___.

C

A

B

lithium

oxygen

lithium oxide

3 Which of the following is not a pure substance?

C Salt water

A

B

CO2

He

D H2O

4 Which of the following is a mixture?

A

B

C

Air

Aspirin

Tacos

D All of the above are mixtures

5 Which of the following is a heterogeneous mixture?

A Trail mix

B

C

Soda

Orange juice (no pulp)

D Vanilla ice cream

6 How many phases are in a homogeneous mixture?

A 1 only

B

C

2 only

2 or more

7 Which of the following is a compound?

B BH3

A

C

H-1

Ca2+

D Hg

8 The variable that is changed in an experiment is the ___.

B independent variable

A

C

control

dependent variable

D hypothesis

9 A concise statement that summarizes numerous observations is a(n) ___.

C scientific law

A

B

hypothesis

scientific theory

D observation

10 Which of the following is not a physical property of hydrogen?

C It combines with oxygen to produce water.

A

B

It is a gas at room temp.

It has a density of 0.89 g/mL.

D It has no color.

11 What state of matter has an indefinite shape and indefinite volume?

C

A

B

Solid

Liquid

Gas

12 What of the following is a physical change?

C Evaporation

A

B

Burning

Rusting

D Explosion

13 The statement “the pressure of a gas increases with decreasing volume because there are more collisions between particles” is a ___.

B scientific theory

A

C

scientific law

hypothesis

D experiment

14 Which of the following is not a physical change?

B cooking a hamburger

A

C

melting butter

freezing water

D peeling an orange

15 Lithium metal reacts with water to produce lithium oxide. Is this a physical or chemical change?

B

A physical

chemical

16 Which statement about compounds is true?

C Compounds have a fixed composition

A

B

Compounds can be separated by physical meansCompounds consist of more than 1 phase

D All of the above are true

17 Which statement about mixtures is true?

A

B

C

Mixtures can consist of one phase or more than 1 phaseMixtures can be separated by physical meansIn a mixture, properties of the individual parts are maintained

D All of the above are true

18What is one difference between a mixture and a compound?

B A compound can only be separated by chemical means

A

C

A compound consists of more than one phase

A mixture can only be formed by chemical means

D A mixture must be uniform in composition

19What is the best way to check that a chemical reaction has occurred?

C See if the chemical composition changed

A

B

See if a gas was produced

D See if the color changed

See if light/energy was produced

20What happens to matter in a chemical reaction?

A It is conserved. You get out what you put in.

B

C Matter is gained.

Matter is lost.

21 What is an intensive property of iron?

A

B

C

Its color

Its hardness

Its magnetism

D All of the above are intensive properties

22 How would you describe the following picture?

A heterogeneous mixture of gas molecules

23 What do chemical symbols and formulas represent, respectively

B Elements and compounds

A

C

Compounds and mixtures

Elements and ions

D Elements and mixtures

24 What state of matter expands when it is heated and is easy to compress?

C Gas

A

B

Solid

Liquid

25 Two features that define matter are _____.

C Mass and volume

A

B

Weight and volume

Mass and velocity

D Weight and velocity

26A substance that can be changed into simpler substances by chemical

means is a ______.

A

B

C

Product

Mixture

Element

D Compound

27The substance produced in a chemical reaction is called a(n) ______.

A product

B

C catalyst

reactant

D excess reagent

Indicate whether the following are physical (P) or chemical (C) properties of

sulfur 28 Sulfur is a solid at room temp

Sulfur is a poor conductor of electricity

Sulfur combines with oxygen to produce sulfur dioxide

29

30

P

C

P

Indicate whether the following are physical (P) or chemical (C) changes

31 Pizza is cut into slices

Aluminum and iodine react to produce aluminum iodide

Water is boiled32

33

P

P

C

Indicate whether the following are heterogeneous (HT) or homogeneous

(HM) mixtures

34 Blueberry muffin

Orange juice with extra pulp

Blood35

36

HT

HM

HT

Indicate whether the following are mixtures (M), elements (E) or

compounds (C)

37 Propane (C3H8)

Ice cream

Gold38

39

C

E

M

What is one unique physical property of iron that allows it to be easily separated from a mixture?

40

Iron is magnetic