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Science 9 Chp. 2 Practice Test

Total questions: 121

Worksheet time: 6hrs 3mins

Name
Class
Date
1.
Which of the following are pure substances?
a)
solutions
b)
compounds
c)
homogeneous mixtures
d)
heterogeneous mixtures
2.
Which of the following is NOT a pure substance?
a)
milk
b)
oxygen
c)
sugar
d)
water
3.

A substance that is made up of only one kind of atom is a(an)

a)

mixture.

b)

element.

c)

compound.

d)

solution.

4.

If an unknown substance CANNOT be broken down into simpler substances, it is

a)

a mixture.

b)

a compound.

c)

an element.

d)

both a mixture and an element.

5.

A mixture that appears to contain only one substance is a(an)

a)

suspension.

b)

compound.

c)

homogeneous mixture.

d)

heterogeneous mixture.

6.

A substance has a melting point of 0° C and a boiling point of 100° C. The substance is most likely

a)

oxygen.

b)

hydrogen.

c)

water.

d)

gold.

7.

Which of the following materials is useful for making molds because it has a low melting point?

a)

wax

b)

water

c)

iron

d)

lead

8.

Filtration can be used to separate mixtures based on

a)

the size of their particles.

b)

their boiling points.

c)

their densities.

d)

their melting points.

9.
When a physical change in a sample occurs, which of the following does NOT change?
a)
composition
b)
size
c)
shape
d)
temperature
10.

A substance that has high reactivity

a)

burns in the presence of oxygen.

b)

displaces dissolved oxygen.

c)

easily combines chemically with other substances.

11.
Which of the following is NOT a clue that a chemical change has occurred?
a)
change in color
b)
production of a gas
c)
precipitate forms
d)
change in shape
12.
Which of the following is a chemical change?
a)
ice melting
b)
water breaking down into hydrogen and oxygen
c)
water boiling
d)
slicing a tomato
13.

Name the two pure substances.

a)

homogeneous and heterogeneous

b)

compounds and mixtures

c)

elements and compounds

14.

The substances in a(an) ____________________ mixture are evenly distributed throughout the mixture.

a)

homogeneous

b)

compound

c)

heterogeneous

d)

element

15.

In a(an) ____________________ mixture, the parts of the mixture are noticeably different from one another.

a)

homogeneous

b)

compound

c)

heterogeneous

d)

element

16.
Measuring ____________________ can be used to test the purity of some substances.
a)
melting point
b)
boiling point
c)
density
d)
elements
17.
____________________ is a process that could be used to separate dissolved particles from the liquid in a solution.
a)
Filtration
b)
Separation
c)
Distillation
d)
Mixation
18.
Rust forms because iron and oxygen are highly ____________________ elements.
a)
formative
b)
reactive
c)
explosive
d)
creative
19.

If you put a teaspoon of sugar in water and stir, what would it result in?

a)

Pure substance

b)

Homogenous mixture

c)

Heterogeneous mixture

d)

Immiscible solution

20.

How do atoms of a molecule combine?

a)

Chemically

b)

Thermally

c)

Physically

d)

Ionically

21.

Which of the following is not a pure substance?

a)

element

b)

compound

c)

molecule

d)

mixture

22.

What is a material that can be represented by a chemical formula?

a)

An element

b)

A mixture

c)

A homogenous mixture

d)

A compound

23.

How many atoms are in a single molecule of C6H6?

a)

2

b)

6

c)

12

d)

36

24.

Which of the following is an element?

a)

nylon

b)

sand

c)

zinc

d)

salt

25.

Different substances in a mixture

a)

keep their properties.

b)

form new substances.

c)

cannot be separated.

d)

combine chemically.

26.

Which of the following is not a physical property?

a)

Freezing point

b)

Boiling point

c)

Reactivity

d)

Density

27.

How can a chemical change be reversed?

a)

They cannot be reversed at all.

b)

They can be reversed by physical changes.

c)

They can be reversed by chemical changes.

28.

Which of the following is best for separating iron from sand?

a)

Magnet

b)

Tweezers

c)

Filter

d)

centrifuge

29.

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

a)

Bending a metal nail

b)

Paint fading

c)

Painting a wall

d)

Water evaporating

30.

Unlike a mixture, a pure substance has

a)

atoms.

b)

molecules.

c)

a specific size.

d)

a fixed composition.

31.

The capacity of a substance to combine chemically with another substance.

a)

Compound

b)

Reactivity

c)

Pure substance

d)

mixture

32.

The smallest particle of a substance that has all of the chemical properties of a substance; it is made up of a group of atoms bonded together.

a)

Atom

b)

Element

c)

Molecule

d)

Compound

33.

The smallest unit of an element that maintains the chemical properties of that element.

a)

Atom

b)

Element

c)

Molecule

d)

Compound

34.

A substance that cannot be separated or broken down into simpler substances by chemical means.

a)

Compound

b)

Element

c)

Molecule

35.

Calcium is a(an)

a)

element.

b)

compound.

c)

homogeneous mixture.

d)

heterogeneous mixture.

36.

Air is a(an)

a)

element.

b)

compound.

c)

homogeneous mixture.

d)

heterogeneous mixture.

37.

Calculate the density of a sample of gas with a mass of 150 g and a volume of 50 cm3.

a)

3 g/cm3

b)

0.33 g/cm3

c)

7500 g/cm3

38.
When matter changes to look different but does not become a new kind of matter.
a)
chemical change
b)
physical change
c)
condensation
d)
evaporation
39.
A change in matter that forms a new substance with different properties.
a)
boiling
b)
rusting
c)
chemical change
d)
physical change
40.
The physical changing of matter from liquid to solid.
a)
melting
b)
freezing
c)
boiling
d)
condensation
41.
The physical changing of matter from solid to liquid.
a)
melting
b)
freezing
c)
evaporation
d)
condensation
42.
Which is an example of a physical change?
a)
burning paper
b)
crushing a box
c)
souring milk
d)
cooking an egg
43.
Which is an example of a chemical change?
a)
tearing paper
b)
cutting an apple
c)
dying a shirt
d)
rusting metal
44.

Which is the best sign that a chemical change has occurred?

a)

change in shape

b)

change in size

c)

change in color

d)

change in temperature

45.

Water freezing is what kind of change?

a)

Chemical Change

b)

Physical Change

46.
Placing a penny in a glass with vinegar and baking soda?
a)
Chemical Change
b)
Physical Change
47.

The state of matter that has no definite size or shape is a

a)

solid.

b)

liquid.

c)

gas.

48.

Molecules are generally closest together in a

a)

solid.

b)

liquid.

c)

gas.

49.

What is the gaseous version of water?

a)

water

b)

steam

c)

ice

50.

When liquid water changes to a gas, it is called

a)

evaporation.

b)

freezing.

c)

condensation.

51.
What state of matter does this picture show?
a)
Liquid
b)
Gas
c)
Solid
d)
Matter
52.
Matter is _____.
a)
anything that occupies space
b)
anything that has mass
c)
anything that occupies space and has mass
d)
not in the atmosphere
53.
In the following formula, how many Sulfur(S) atoms are there?
Al(SO4)2
a)
1
b)
2
c)
6
d)
8
54.
In the following formula, how many Aluminum(Al) atoms are there?
Al(SO4)2
a)
1
b)
2
c)
6
d)
8
55.
In the following formula, how many atoms are there?
Al(SO4)2
a)
6
b)
8
c)
11
d)
12
56.
Matter that has a fixed composition and definite properties is _____.
a)
mixture
b)
element
c)
molecule
d)
pure substance
57.
Which of the following is an example of a heterogeneous mixture?
a)
chocolate chip cookie
b)
tea
c)
honey
d)
gunpowder
58.
Which of the following would float in water?
Object A with a density of 0.1 g/ml
Object B with a density of 0.9 g/ml
Object C with a density of 1.25 g/ml
a)
Object A
b)
Object A and B
c)
Object A, B, and C
d)
None of the objects
59.
Which of the following is an example of a chemical property?
a)
flammability
b)
nonflammability
c)
reactivity with acid
d)
all of these are chemical properties
60.
Which of the following is NOT a chemical change?
a)
baking a cake
b)
digesting food
c)
melting ice
d)
rotting egg
61.
Which of the following is a clue that a chemical change is taking place?
a)
production of heat
b)
fizzing
c)
change in color
d)
all of these are chemical changes
62.
Which of the following is an example of a physical change?
a)
production of light or odor
b)
foaming
c)
dissolving
d)
all of these are examples of physical changes
63.
A liquid has a volume of 550 mL and a mass of 220 g.  What is its density?
a)
0.4 g/ml
b)
2.5 g/ml
c)
2.5 ml/g
d)
121,000 g ml
64.
A piece of titanium measures 5 cm long, 4 cm wide, and 2.5 cm high and has a mass of 250 g.  What is its density?
a)
0.2 g/cm3
b)
0.2 cm3/g
c)
5 g/cm3
d)
22,500 g cm3
65.
A piece of metal has a density of 8.6 g/cm3 and a volume of 4.3 cm3. What is the mass of this piece of metal?
a)
0.5 cm3/g
b)
2 g/cm3
c)
36.98 cm3
d)
36.98 g
66.
The density of a piece of brass is 11.5 g/cm3. If the mass of the brass is 471.5 g, find the volume of the brass.
a)
0.024 g
b)
41 cm3
c)
5422.25 g
d)
5422.25 cm3
67.

What is the definition of matter?

a)

Anything that has mass and takes up space

b)

Anything that can be seen with the naked eye

c)

Anything that is a liquid or a solid

d)

Anything that is made of molecules only

68.

Which of the following is NOT a way that matter can be classified?

a)

Element

b)

Compound

c)

Mixture

d)

Solution only

69.

Why are carbon and copper classified as elements?

a)

They are made of one kind of atom

b)

They are both metals

c)

They are both found in nature

d)

They are both compounds

70.

What is an element?

a)

A substance that cannot be separated or broken down into simpler substances by chemical means

b)

The smallest unit of a compound

c)

A mixture of atoms

d)

A molecule made of two or more atoms

71.

What is the smallest unit of an element that maintains the properties of that element?

a)

Atom

b)

Molecule

c)

Compound

d)

Mixture

72.

How are elements represented?

a)

By symbols

b)

By numbers

c)

By colors

d)

By shapes

73.

What is a molecule?

a)

The smallest particle of a substance that has all of the chemical properties of that substance

b)

The largest unit of an element

c)

A mixture of compounds

d)

A symbol for an element

74.

Atoms that make up a molecule act as:

a)

A unit

b)

Separate elements

c)

Different compounds

d)

Individual substances

75.

A molecule is made up of:

a)

One atom or two or more atoms bonded together

b)

Only one kind of atom

c)

Only two atoms

d)

Only elements

76.

Explain why an element cannot be separated into simpler substances by chemical means. (DoK Level 2)

a)

Because it is made of only one kind of atom

b)

Because it is a mixture

c)

Because it is a compound

d)

Because it is a molecule

77.

Describe the relationship between atoms and molecules. (DoK Level 2)

a)

Atoms bond together to form molecules, which act as a unit

b)

Molecules break down to form atoms

c)

Atoms and molecules are the same thing

d)

Molecules are made only of compounds

78.

Given a substance that cannot be separated by chemical means, how would you classify it? (DoK Level 3)

a)

As an element

b)

As a compound

c)

As a mixture

d)

As a molecule

79.

If you have a sample made up of two or more atoms bonded together, what is it called? (DoK Level 3)

a)

A molecule

b)

An element

c)

A mixture

d)

A symbol

80.

Which of the following best defines a compound?

a)

A substance made up of atoms of two or more different elements joined by chemical bonds

b)

A mixture of two or more substances not chemically combined

c)

A sample of matter with definite chemical and physical properties

d)

A substance that cannot be mixed with others

81.

What does a chemical formula represent?

a)

A compound

b)

A mixture

c)

A pure substance

d)

A heterogeneous mixture

82.

Which of the following is an example of a pure substance?

a)

A single element or a single compound with definite chemical and physical properties

b)

A combination of two or more substances not chemically combined

c)

A mixture of gases and liquids

d)

A substance that cannot be mixed

83.

How are mixtures classified?

a)

By how thoroughly the substances mix

b)

By their chemical formulas

c)

By their color

d)

By their boiling points

84.

Which statement describes a heterogeneous mixture?

a)

Substances aren’t mixed uniformly and are not evenly distributed

b)

Substances are evenly distributed and the mixture is the same throughout

c)

Substances that can be mixed

d)

Substances that cannot be mixed

85.

What is the difference between a homogeneous mixture and a heterogeneous mixture?

a)

Homogeneous mixtures are evenly distributed; heterogeneous mixtures are not

b)

Homogeneous mixtures cannot be mixed; heterogeneous mixtures can

c)

Homogeneous mixtures are pure substances; heterogeneous mixtures are compounds

d)

Homogeneous mixtures are gases; heterogeneous mixtures are liquids

86.

Which term describes substances that can be mixed?

a)

Miscible

b)

Immiscible

c)

Compound

d)

Element

87.

Gases can mix with which of the following?

a)

Liquids

b)

Solids

c)

Compounds

d)

Elements

88.

A student is given a sample that contains two substances that are not chemically combined. How should this sample be classified?

a)

Mixture

b)

Compound

c)

Pure substance

d)

Element

89.

If a mixture is the same throughout and substances are evenly distributed, what type of mixture is it?

a)

Homogeneous mixture

b)

Heterogeneous mixture

c)

Immiscible mixture

d)

Compound

90.

Which of the following is classified as a physical property?

a)

Flammability

b)

Reactivity

c)

Density

d)

Ability to rust

91.

What is the definition of density?

a)

The ratio of the volume of a substance to its mass

b)

The ratio of the mass of a substance to the volume of the substance

c)

The amount of space a substance occupies

d)

The weight of a substance per unit volume

92.

Which unit is commonly used to express density?

a)

kg/m³

b)

g/cm³

c)

m/s²

d)

N/m²

93.

Why can physical properties help identify substances?

a)

Because they change the identity of the substance

b)

Because they are characteristics that can be observed without changing the identity of the substance

c)

Because they are only present in liquids

d)

Because they are always visible

94.

Which of the following is NOT an example of a physical property?

a)

Color

b)

Melting point

c)

Magnetism

d)

Flammability

95.

How is density different from weight?

a)

Density is the force of gravity on an object, while weight is mass per unit volume

b)

Density is the ratio of mass to volume, while weight is the force of gravity on an object

c)

Density and weight are the same

d)

Density is measured in newtons, while weight is measured in grams per cubic centimeter

96.

A student measures the mass and volume of a substance. What physical property are they determining?

a)

Hardness

b)

Density

c)

Magnetism

d)

Boiling point

97.

Which physical property describes the temperature and pressure at which a solid becomes a liquid?

a)

Boiling point

b)

Melting point

c)

Hardness

d)

Magnetism

98.

Why are color, volume, and density classified as physical properties?

a)

Because they can only be measured after a chemical change

b)

Because they are characteristics that can be observed without changing the identity of the substance

c)

Because they are only found in gases

d)

Because they are related to chemical reactions

99.

Which physical property describes the temperature and pressure at which a liquid becomes a gas?

a)

Melting point

b)

Boiling point

c)

Magnetism

d)

Hardness

100.

Which of the following best defines a chemical property?

a)

A property that describes how a substance changes into a new substance

b)

A property that can be observed without changing the identity of a substance

c)

A property that describes the color of a substance

d)

A property that measures the mass of a substance

101.

What is flammability?

a)

The ability to burn

b)

The ability to dissolve in water

c)

The ability to conduct electricity

d)

The ability to change color

102.

Which statement correctly describes reactivity?

a)

The capacity of a substance to combine chemically with another substance

b)

The ability of a substance to change its shape

c)

The ability of a substance to reflect light

d)

The ability of a substance to freeze

103.

How are physical and chemical properties different?

a)

Physical properties can be observed without changing the identity of a substance, while chemical properties can be observed only when the identity changes

b)

Physical properties require a chemical reaction to be observed, while chemical properties do not

c)

Physical properties are always visible, while chemical properties are always invisible

d)

Physical properties are only found in solids, while chemical properties are only found in liquids

104.

Why are flammability and reactivity classified as chemical properties?

a)

Because they describe how a substance changes into a new substance

b)

Because they are physical changes

c)

Because they do not involve any change in the substance

d)

Because they are related to the color of the substance

105.

A student observes a substance burning and forming a new material. Which property is being observed?

a)

Chemical property

b)

Physical property

c)

Density

d)

Hardness

106.

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

a)

Cutting paper

b)

Burning wood

c)

Rusting iron

d)

Baking bread

107.

What is the main difference between a physical change and a chemical change?

a)

Physical changes form new substances, chemical changes do not

b)

Chemical changes do not affect properties, physical changes do

c)

Physical changes do not change a substance’s identity, chemical changes do

d)

Chemical changes only occur in laboratories

108.

Which process is considered a chemical change?

a)

Dissolving sugar in water

b)

Crushing a can

c)

Burning a log

d)

Cutting hair

109.

Why is baking bread considered a chemical change?

a)

It only changes the shape of the bread

b)

It forms entirely new substances with different properties

c)

It does not involve any change in properties

d)

It is a reversible process

110.

Which of the following is NOT an example of a physical change?

a)

Reshaping clay

b)

Dissolving salt in water

c)

Rusting of iron

d)

Crushing ice

111.

Explain how mixtures and compounds can be broken down, using evidence from physical and chemical changes.

a)

Mixtures can only be broken down by chemical changes, compounds by physical changes

b)

Both mixtures and compounds can be broken down by physical changes only

c)

Mixtures can be separated by physical changes, compounds require chemical changes to break down into new substances

d)

Neither mixtures nor compounds can be broken down

112.

Which of the following is a sign of a chemical change?

a)

Change of color

b)

Melting

c)

Freezing

d)

Dissolving

113.

Why can't chemical changes be reversed by physical changes?

a)

Because chemical changes create new substances

b)

Because physical changes are permanent

c)

Because chemical changes only affect appearance

d)

Because physical changes require heat

114.

Which method can be used to physically separate a mixture?

a)

Centrifuge

b)

Electrolysis

c)

Combustion

d)

Fermentation

115.

When saltwater is heated and the water evaporates, what remains?

a)

Salt

b)

Water

c)

Sugar

d)

Oil

116.

Which process is used to separate a mixture based on different boiling points?

a)

Distillation

b)

Filtration

c)

Chromatography

d)

Magnetism

117.

How can compounds be broken down?

a)

By chemical changes

b)

By physical changes

c)

By freezing

d)

By dissolving

118.

What happens when mercury(II) oxide is heated?

a)

It breaks down into mercury and oxygen

b)

It melts into a liquid

c)

It forms water and carbon dioxide

d)

It evaporates completely

119.

When a current is passed through melted table salt, what elements are produced?

a)

Sodium and chlorine

b)

Hydrogen and oxygen

c)

Carbon and nitrogen

d)

Potassium and bromine

120.

When you open a bottle of soda, what does carbonic acid break down into?

a)

Carbon dioxide and water

b)

Oxygen and hydrogen

c)

Sodium and chlorine

d)

Mercury and oxygen

121.

Explain why mixtures can be separated by physical changes but compounds require chemical changes for separation.

a)

Mixtures are made of substances that retain their properties, while compounds are chemically bonded.

b)

Mixtures are always liquids, while compounds are solids.

c)

Mixtures contain only one substance, while compounds contain many.

d)

Mixtures are created by chemical reactions, while compounds are not.

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