Free Printable Classification, Properties, Changes, Conservation Unit Test Rev.

Free Printable Worksheets

Worksheets

Classification, Properties, Changes, Conservation Unit Test Rev.

Total questions: 80

Worksheet time: 1hrs 3mins

Name

Class

Date

1.

A student mixes yellow powder with water. Which observation would prove a CHEMICAL change occurred?

a)

The powder DISSOLVED in the water

b)

The water turned the COLOR yellow

c)

The bag's TEMPERATURE changed

d)

The STATE OF MATTER changed

2.

Which of the following options provides evidence of a CHEMICAL change?

a)

Wood is burned releasing ash and smoke

b)

Rocks separate when soil is sifted

c)

Water turns to ice when you put it in the freezer

d)

Salt dissolves in water

3.

Which of the following examples provides evidence of a PHYSICAL change?

a)

Wood is burned and releases ash and smoke

b)

Iron rusts over time

c)

When mixed, baking soda and vinegar form gas bubbles

d)

A piece of paper changes shape when you rip it up

4.

A white tablet is dropped into water. The water becomes cloudy and bubbles are produced. What type of change has occurred?

a)

Physical change

b)

Chemical change

c)

No change

5.

Which observations prove a chemical change has occurred?

a)

Dissolving and expected color change

b)

Mixing and dissolving

c)

State of matter change and boiling water bubbles

d)

Unexpected color change and temperature change

6.

When mixing milk and vinegar, a white, chunky, solid substance is formed. What has occurred?

a)

Physical change: state of matter

b)

Chemical change: production of a solid

c)

Physical change: freezing

d)

Chemical change: rust

7.

When iron is exposed to air over a long period of time, it forms rust. This is an example of what?

a)

A new substance forming

b)

Color change: no new substance

c)

Shape change: no new substance

d)

Burning: a new substance

8.

A physical change...

a)

Changes the physical properties of an object, but does not create a new substance.

b)

Creates a new substance and cannot be undone.

9.

A chemical change...

a)

Changes the physical properties of an object, but does not create a new substance.

b)

Creates a new substance and cannot be undone.

10.

Is this an example of a physical or chemical change?

a)

Physical

b)

Chemical

11.

Is this an example of a physical or chemical change?

a)

Physical

b)

Chemical

12.

Is this an example of a physical or chemical change?

a)

Physical

b)

Chemical

13.

Is this an example of a physical or chemical change?

a)

Physical

b)

Chemical

14.

Is this an example of a physical or chemical change?

a)

Physical

b)

Chemical

15.

Is this an example of a physical or chemical change?

a)

Physical

b)

Chemical

16.

Is this an example of a physical or chemical change?

a)

Physical

b)

Chemical

17.

Melting a chocolate bar is a...

a)

Physical change

b)

Chemical change

18.

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

a)

Crumpling paper

b)

Sharpening a pencil

c)

Clothes shrinking in the dryer

d)

Milk turning sour

19.

A change in which NEW substances are formed.

a)

Chemical change

b)

Physical change

20.

Which of the following is NOT an example of chemical change?

a)

Milk turning sour

b)

Burning wood

c)

Breaking a pencil

d)

Metal turning rusty

21.

The following statements describe a physical property EXCEPT one.

a)

Ice melts when heated

b)

Aluminum is a silver-colored metal

c)

The density of water is 1g/cm³

d)

An iron bar rusts

22.

In identifying a sample of a pure substance, which may be its chemical property?

a)

Its mass is 26.87 g

b)

It melts when heated

c)

It burns in air

d)

It is a good heat conductor

23.

A classification of matter that is made up on only 1 type of particle is called

a)

a heterogeneous mixture

b)

a pure substance

c)

a homogeneous mixture

d)

a blender

24.

Blood is a fluid found in the bodies of humans and other animals. It can be physically separated into plasma, red blood cells and white blood cells. Blood is a ___________________

a)

pure substance

b)

mixture

25.

A marshmallow is toasted over a campfire is;

a)

Physical Change

b)

Chemical Change

26.

This picture represents:

a)

Element

b)

Compound

c)

Mixture of Elements

d)

Mixture of Compounds

27.

Which is NOT a chemical change?

a)

Leaves changing colors in the fall

b)

Iron rusting

c)

Digesting Lunch

d)

Ice Melting

28.

Aluminium foil is an example of a.....

a)

pure element

b)

pure compound

c)

heterogeneous mixture

d)

homogeneous mixture

29.

Which of the following is a chemical property?

a)

Melting point

b)

Ductility

c)

Colour

d)

Flammability

30.

Which of the following is a chemical property?

a)

Melting point

b)

Ductility

c)

Colour

d)

Flammability

31.

Which of the following can only be observed when it is changing composition?

a)

chemical property

b)

physical property

32.

This picture represents which of the following?

a)

element

b)

compound

c)

homogeneous mixture

d)

heterogeneous mixture

33.

Which of the following is NOT a pure substance?

a)

milk

b)

oxygen

c)

water

d)

carbon dioxide

34.

Which of the following is a heterogeneous mixture?

a)

water in a swimming pool

b)

sugar water

c)

a jar of mixed nuts

d)

stainless steel

35.

This image represents a(n)

a)

element

b)

compound

c)

mixture

d)

colloid

36.

The air that fills this room would be classified as

a)

an element

b)

a compound

c)

a homogeneous mixture

d)

a pure substance

37.

Why is the composition of every element fixed?

a)

Because it contains only one type of atom.

b)

Because the ratio of atoms is always the same.

c)

Because the atoms are so small.

d)

Because God said so.

38.

Which one of the following does not have an indicator for chemical change?

a)

Two clear liquids form precipitate after mixing

b)

The milk smells when you leave it out of the refrigerator

c)

Fireworks explode with different shapes and colors

d)

Prepare a cold Kool-Aid in a hot summer day.

39.

How many Oxygens are in this molecule?
(OH)₂

a)

4

b)

1

c)

2

d)

3

40.

What are the smaller numbers that you CANNOT change in a chemical equation?

a)

Coefficient

b)

Products

c)

Reactants

d)

Subscript

41.

What are the larger numbers that you CAN CHANGE in a chemical equation?

a)

Coefficient

b)

Products

c)

Reactants

d)

Subscripts

42.

How many HCl molecules do you need to balance this equation?
Mg + __HCl ---> MgCl₂ + H₂

a)

1

b)

2

c)

3

d)

4

43.

What law governs the balancing of chemical equations?

a)

Law of Energy

b)

Law of Conservation of Matter/Mass

c)

Law of Gravity

d)

Law of Matter Movement

44.

Balance this equation: _Zn + _O2 --> _ZnO

a)

1, 1, 2

b)

2, 1, 2

c)

1, 1, 1

d)

2 ,2, 2

45.

Is this balanced?
Al + O₂ → 2Al₂O₃

a)

Yes

b)

No

46.

Which side of the yield sign are the reactants found?

a)

to the left

b)

to the right

c)

in the middle

47.

Which side of the arrow are the products found?

a)

to the left

b)

to the right

c)

in the middle

48.

How many water molecules do you need to balance the equation: __H20 --> 2H2 + O2?

a)

1

b)

2

c)

3

d)

0

49.

What does the Law of Conservation of Mass state?

a)

Matter cannot be gained or lost in a chemical reaction.

b)

Matter can only be lost in a chemical reaction.

c)

Matter can only be gained in a chemical reaction.

d)

Matter can be gained and lost in a chemical reaction.

50.

What is the total number of atoms present in 5Na₃PO₄

a)

5

b)

40

c)

55

d)

8

51.

Is the following equation balanced?...
Al + O₂ --> 2Al₂O₃

a)

Yes!

b)

No!

52.

Is the following equation balanced?
2C₂H₂ + 5O₂ --> 4CO₂ + 2H₂O

a)

yes

b)

no

53.

Which of the following equations are correctly balanced?

a)

12CO₂ +H₂O --> C₆H₁₂O₆ + O₂

b)

CO₂ + 9H₂O --> C₆H₁₂O₆ + O₂

c)

CO₂ + H₂O --> 3C₆H₁₂O₆ + O₂

d)

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

54.

Is the following reaction balanced?
NaHCO₃ --> Na₂CO₃ + H₂O + CO₂

a)

yes

b)

no

55.

Balance the following equation:

___ Mg+ ___ O₂→___ MgO

a)

1, 1, 3

b)

2, 1, 2

c)

1, 2, 1

d)

2, 2, 2

56.

Anything that has mass & takes up space

a)

gravity

b)

force

c)

matter

d)

volume

57.

Measure of the amount of matter

a)

mass

b)

volume

c)

weight

d)

density

58.

Smallest unit of an element

a)

compound

b)

atom

c)

molecule

d)

product

59.

Substance that cannot be broken into simpler substances

a)

element

b)

molecule

c)

gram

d)

proton

60.

Substance made up of chemically combined elements

a)

atom

b)

element

c)

electron

d)

compound

61.

Number placed in front of a chemical formula

a)

product

b)

coefficient

c)

reactant

d)

subscript

62.

Number written below & to the right of a chemical symbol

a)

subscript

b)

reactant

c)

product

d)

coefficient

63.

Substances that form as the result of a chemical reaction

a)

products

b)

reactants

c)

coefficients

d)

subscripts

64.

Substances present at the start of a chemical reaction

a)

subscripts

b)

coefficients

c)

reactants

d)

products

65.

How many oxygen atoms are in the products for the chemical reaction below?
$4Fe\ +\ 3O_{2\ }\rightarrow\ 2Fe_2O_3$

a)

2

b)

3

c)

5

d)

6

66.

The Law of Conservation of Mass says that matter can neither be __________ or __________.

a)

created; destroyed

b)

recycled; renewed

c)

subtracted; added

d)

joined; separated

67.

According to the Law of Conservation of Mass, what happens to the wood and oxygen when it is burned?

a)

The wood disappears.

b)

It stays the same chemically.

c)

The atoms in the wood and oxygen rearrange and form smoke and ash.

d)

Nothing.

68.

A 55-gram egg is placed in a pot. After the egg is boiled, which is most likely the mass of the egg?

a)

50

b)

55

69.

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?

a)

4g

b)

5g

c)

9g

d)

14g

70.

When sodium and chlorine combine to form sodium chloride, sodium chloride is the:

a)

Originator

b)

Reactant

c)

Product

d)

Produce

71.

Jason poured 500 grams of water into a container and tightly sealed it. The water was allowed to freeze. Which is most likely true about the ice that formed?

a)

The mass of the ice is the same as the mass of the water.

b)

The mass of the ice is greater than the mass of the water.

c)

The ice formed is a different substance than the water.

d)

The ice formed is the same temperature as the water.

72.

Anthony is performing an experiment. He adds 0.25 grams of baking soda to 5 grams of water and stirs. Anthony watches as the baking soda dissolves in the water. If Anthony weighs the water and baking soda solution, what will its mass be?

a)

4.75 grams

b)

5.0 grams

c)

5.25 grams

d)

7.5 grams

73.

Matter can not be created nor destroyed: it can only be

a)

Destroyed a little bit

b)

Invisible

c)

Transformed, changed

d)

None of the above

74.

If reaction starts with 20g of reactants it should produce

a)

a total of 40g of products

b)

a total of 10g of products

c)

a total of 80 g of products

d)

a total of 20g of products

75.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

76.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

77.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

78.

A student heated a 10 gram sample of a chemical in an open container. A chemical reaction occurred, and the mass of the sample was measured again. The mass of the sample was found to be less than before the reaction. Which of the following best explains the decrease in mass of the sample?

a)

The heat caused the chemical to become less dense.

b)

The reaction gave off more heat than was added.

c)

Some of the lighter particles were destroyed.

d)

Some of the particles escaped as a gas formed.

79.

A student dissolved 25 grams of salt into 1,000 grams of water. What should the mass of the saltwater mixture be?

a)

975 grams

b)

1,000 grams

c)

1,025 grams

d)

2,500 grams

80.

A student measures the mass of an iron nail to be 25 grams. The student heats the nail over a bunsen burner and measures the mass of the nail afterwards. The mass of the nail is found to be greater after burning. Which of the following best explains the increase in mass of the nail?

a)

The heat caused the compound to become more dense.

b)

The reaction gave off less heat than was added.

c)

Some of the heavier particles multiplied inside the nail.

d)

Extra particles from the air were added to the nail during burning.

100 %

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