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Chemistry Matters!

Total questions: 40

Worksheet time: 40mins

Name
Class
Date
1.

Which formula represents a mixture?

a)

C6H12O6(l)

b)

C6H12O6(s)

c)

LiCl(aq)

d)

LiCl(s)

2.

Bronze contains 90 to 95 percent copper and 5 to 10 percent tin. Because these percentages can vary, bronze is classified as

a)

a compound

b)

an element

c)

a mixture

d)

a substance

3.

Which diagram or diagrams represent a mixture of elements A and B?

a)

X, only

b)

Z, only

c)

X and Y

d)

X and Z

4.

Which of these terms refers to matter that could be heterogeneous?

a)

element

b)

mixture

c)

compound

d)

solution

5.

Which material is a mixture?

a)

water

b)

air

c)

methane

d)

magnesium

6.

Any substance composed of two or more elements that are chemically combined in a fixed proportion is

a)

an isomer

b)

an isotope

c)

a solution

d)

a compound

7.

The arrangement of particles is most ordered in a sample of

a)

NaCl(aq)

b)

NaCl(l)

c)

NaCl(g)

d)

NaCl(s)

8.
a)
b)
c)
d)
9.

The joule is a unit of

a)

concentration

b)

energy

c)

pressure

d)

volume

10.

At STP, which physical property of aluminum always remains the same from sample to sample

a)

mass

b)

density

c)

length

d)

volume

11.

At STP, which 2.0-gram sample of matter uniformly fills a 340-milliliter closed container?

a)

Br2(l)

b)

Fe(NO3)2(s)

c)

KCl(aq)

d)

Xe(g)

12.

What substance can be decomposed by chemical means?

a)

aluminum

b)

octane

c)

silicon

d)

xenon

13.

Which substance can be broken down by chemical means?

a)

CO

b)

Ce

c)

Ca

d)

Cu

14.

Which substance can not be broken down by a chemical change?

a)

ammonia

b)

magnesium

c)

methane

d)

water

15.

Which substance represents a compound?

a)

C(s)

b)

Co(s)

c)

CO(g)

d)

O2(g)

16.

A compound differs from a mixture in that a compound always has a

a)

homogeneous composition

b)

maximum of two components

c)

minimum of three components

d)

heterogeneous composition

17.

Which substance can not be decomposed into simpler substances?

a)

ammonia

b)

aluminum

c)

methane

d)

methanol

18.
a)

min 2 to min 4

b)

min 4 to min 5

c)

min 5 to min 7

d)

min 7 to min 9

19.

A sample of water is boiling as heat is added at a constant rate. Which statement describes the potential energy and average kinetic energy of the water molecules in this sample?

a)

The potential energy decreases and the average kinetic energy remains the same.

b)

The potential energy decreases and the average kinetic energy increases.

c)

The potential increases and the average kinetic energy remains the same.

d)

The potential energy increases and the average kinetic energy increases.

20.

Which phase change is accompanied by the release of heat?

a)

H2O(s) --> H2O(g)

b)

H2O(s) --> H2O(l)

c)

H2O(l) --> H2O(g)

d)

H2O(l) --> H2O(s)

21.

The average kinetic energy of the particles in a sample of matter is expressed as

a)

density

b)

volume

c)

pressure

d)

temperature

22.

Which sample of water contains particles having the highest average kinetic energy?

a)

25 mL of water at 95 C

b)

45 mL of water at 75 C

c)

75 mL of water at 75 C

d)

95 mL of water at 25 C

23.
a)

Both potential energy and average kinetic energy increase.

b)

Both potential energy and average kinetic energy decrease.

c)

Potential energy increases and average kinetic energy remains the same.

d)

Potential energy remains the same and average kinetic energy increases.

24.
a)

Potential energy decreases and average kinetic energy increases.

b)

Potential energy increases and average kinetic energy increases.

c)

Potential energy increases and average kinetic energy remains the same.

d)

Potential energy remains the same and average kinetic energy increases.

25.

The temperature of 100. grams of water changes from 16.0 C to 20.0 C. What is the total number of Joules of heat energy absorbed by the water?

a)

105

b)

168

c)

420

d)

1680

26.

Which line segment of the graph represents boiling?

a)

AB

b)

BC

c)

CD

d)

DE

27.

Which element has a melting point higher than the melting point of rhenium?

a)

iridium

b)

osmium

c)

tantalum

d)

tungsten

28.

What is the minimum amount of heat required to completely melt 20.0 grams of ice at its melting point?

a)

20.0 J

b)

83.6 J

c)

6,680 J

d)

45,200 J

29.

Which substance can not be broken down by a chemical change?

a)

ammonia

b)

ethanol

c)

tungsten

d)

water

30.
a)

I and II

b)

I and III

c)

II and III

d)

II and IV

31.
a)

an element

b)

a compound

c)

a homogeneous mixture

d)

a heterogeneous mixture

32.

Salt water is classified as a

a)

compound because the proportion of its atoms is fixed

b)

compound because the proportion of its atoms can vary

c)

mixture because the proportion of its components is fixed

d)

mixture because the proportion of its components can vary

33.

A substance is classified as either an element or a

a)

compound

b)

solution

c)

heterogeneous mixture

d)

homogeneous mixture

34.

Which substance can be broken down by chemical means?

a)

magnesium

b)

manganese

c)

mercury

d)

methanol

35.

Which substance can not be decomposed by a chemical change?

a)

AlCl3

b)

H2O

c)

HI

d)

Cu

36.
a)
b)
c)
d)
37.

Which statement describes the components of a mixture?

a)

Each component gains new properties.

b)

Each component loses its original properties.

c)

The proportions of components can vary.

d)

The proportion of components cannot vary.

38.

The list below shows four samples: A, B, C, and D

(A) HCl(aq)

(B) NaCl(aq)

(C) HCl(g)

(D) NaCl(s)

Which samples are mixtures?

a)

A and B

b)

A and C

c)

C and B

d)

C and D

39.

Which statement best describes all compounds?

a)

They can be decomposed by chemical change.

b)

They can be decomposed by physical means.

c)

They contain at least three elements.

d)

They contain ionic bonds.

40.

A sample of unknown composition was tested in a laboratory. The sample could not be decomposed by physical or chemical means. On the basis of these results, the laboratory reported that the unknown sample was most likely

a)

a compound

b)

an element

c)

a mixture

d)

a solution

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