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Chemistry - 7th Grade

Total questions: 105

Worksheet time: 1hrs 27mins

Name
Class
Date
1.

The atomic number of oxygen is

a)

8

b)

15.9994

c)

16

d)

O

2.

The atomic mass of nitrogen is

a)

7

b)

14.007

c)

21.007

d)

Cannot be known from the given

3.

The number of protons in a sulfur atom is

a)

0

b)

16

c)

32

d)

None of the above answers

4.

The number of electrons in a Lithium atom is

a)

3

b)

4

c)

6

d)

7

5.

The number of neutrons in a Beryllium atom is

a)

4

b)

5

c)

9

d)

9.012

6.

Identify the elements in this compound.

a)

Carbon, Helium, Oxygen

b)

Chromium, Hydrogen, Oxygen

c)

Calcium, Hydrogen, Oxygen

d)

Carbon, Hydrogen, Oxygen

7.

The total number of atoms in this compound is

a)

4

b)

7

c)

9

d)

12

8.

Evaporation is the change of state from

a)

Solid to liquid

b)

Liquid to gas

c)

Gas to solid

d)

Gas to liquid

9.

The opposite phase of melting is

a)

Condensation

b)

Vaporization

c)

Sublimation

d)

Freezing

10.

Which is a neutron?

a)

a

b)

b

c)

c

d)

Non of the above

11.

Boron is in the second row of the periodic table. This means that

a)

It has two protons

b)

It is in the second group

c)

It has two shells (orbits)

d)

It has two electrons in the outer shell

12.

Sodium (Na) is in the first group of the periodic table. This means that

a)

It is in the first period

b)

It has one shell (orbit)

c)

It has only one proton

d)

It has only one electron in the valence shell

13.

Electrons are

a)

Positively charged particles

b)

Negatively charged particles

c)

Neutral

14.

You can find 2 elements in the periodic table with the same symbol.

a)

True

b)

False

15.

Which one of those does not occur in a physical change?

a)

Change in color

b)

Change in shape

c)

Change in size

16.

The state of matter that takes the shape of the container is

a)

Solid

b)

Liquid

c)

Gas

d)

Plasma

17.

During a chemical reaction, atoms are not

a)

Rearranged

b)

Created

c)

Destroyed

18.

Which of the following are the reactants of photosynthesis?

a)

Oxygen

b)

Sugar

c)

Carbon Dioxide

d)

Water

19.

Which of the following is not a sign of a chemical change?

a)

Releasing bubbles

b)

Production of new materials

c)

Releasing Heat

d)

Changing state

20.

If an atom has 3 electrons, how many protons does it have?

a)

1

b)

2

c)

3

d)

4

21.

Select 2 physical changes.

a)

Ice melting

b)

Wood burning

c)

Metal rusting

d)

Breaking a glass

22.

How many protons are there in this atom?

a)

3

b)

4

c)

6

d)

7

23.

A group of elements that are shiny, conduct heat and electricity well is called

a)

Metals

b)

Non-metals

c)

Metalloids

24.

Group 18 contains elements that do not combine with other elements. They are called

a)

Alkali metals

b)

Alkaline metals

c)

Noble gases

d)

Halogens

25.

Which compound of the following is organic?

a)

CaCl2

b)

CH4

c)

CO2

26.

How many hydrogen atoms are there in 3C2H6?

a)

2

b)

3

c)

6

d)

18

27.

How many elements are there in C6H12O6?

a)

3

b)

6

c)

24

d)

None of the above answers

28.

Fill in the blank to balance the chemical equation.

2KI + ____Cl2 → 2KCl + I2

a)

0

b)

1

c)

2

d)

3

29.

What coefficient should go in the blank space to balance the chemical equation?

2Al +____ HCl → 2AlCl3 + 3H2

a)

1

b)

2

c)

3

d)

6

30.

Is the following equation balanced?

a)

Yes

b)

No

31.

What will weigh more when a chemical change is complete?

a)

The reactants before the chemical change

b)

The products after the reaction is complete

c)

Both reactants and products weigh the same

d)

Both reactants and products will lose mass after the reaction is complete

32.

________ has a definite shape and definite volume.

a)

Solid

b)

Liquid

c)

Gas

d)

Plasma

33.

In which state of matter are particles moving the slowest?

a)

Solid

b)

Liquid

c)

Gas

d)

Plasma

34.

How do you make matter change state?

a)

Add energy to it

b)

Take energy away from it

c)

All of the above are correct

35.

Natural Materials are more durable than Synthetic Materials.

a)

True

b)

False

36.

Plastics are of two types.

a)

True

b)

False.

37.

What do you measure to find out how much space an object takes?

a)

mass

b)

volume

c)

length

d)

area

38.

A measure of how much mass is contained in a given unit of volume.

a)

mass

b)

volume

c)

density

39.

Jack has a rock. The rock has a mass of 14g and a volume of 2cm3. What is the density of the rock?

a)

28 g

b)

14 mL

c)

7 g/cm3

d)

2 g/mL

40.

What is made up two or more elements that are chemically combined?

a)

Atom

b)

Element

c)

Compound

d)

Mixture

41.

What cannot be broken down into other substances?

a)

Element

b)

Compound

c)

Mixture

d)

Solid

42.

A combination of substances that are not chemically combined is called

a)

Mixture

b)

Compound

c)

Reactants

43.

Water is an organic compound.

a)

True

b)

False

44.

Which has a greater distance between particles?

a)

Liquid

b)

Gas

45.

Dissolving salt in water is a

a)

Physical Change

b)

Chemical Change

46.

If the number of protons in an element changes, a new element is formed

a)

True

b)

False

47.

Which of these is a property of metals?

a)

Malleable

b)

Very brittle

c)

Can't conduct electricity

48.

Describe what luster means

a)

How an object reflects light

b)

If an object floats

c)

How soft an object is

49.

I have an object that is dull, brittle, and an insulator. What is it?

a)

metal

b)

non-metal

c)

metalloid

50.

What is the function of a carbohydrate?

a)

Provides energy

b)

Stores genetic information

c)

Builds up muscles

51.

What are the building blocks of proteins?

a)

Carbon atoms

b)

Hydrogen atoms

c)

Amino acids

52.

How do lipids function for cells?

a)

store information

b)

store energy

c)

breakdown wastes

53.

DNA and RNA are examples of

a)

Carbohydrates

b)

Proteins

c)

Lipids

d)

Nucleic acids

54.

Natural fibers are

a)

Man made

b)

Found in nature

c)

Long lasting

d)

Are made in laboratories

55.

What is the advantage of using synthetic materials?

a)

Cheaper

b)

Better quality

c)

Do not catch fire

56.

What does the nucleus of an atom contain?

a)

Electrons and neutrons

b)

Protons and neutrons

c)

Electrons and protons

d)

DNA

57.

The majority of an atom is made up of empty space.

a)

True

b)

False

58.

Neon has an atomic number of 10 and an atomic mass of 20. How many protons, electrons, and neutrons will it have?

a)

P=10 E=10 N=11

b)

P=10 E=10 N=10

c)

P=20 E=20 N=10

d)

P=10 E=20 N=10

59.

Which of the following represents an element?

a)

H2O

b)

NaCl

c)

H2

d)

CaCO3

60.

Cracker jacks contain peanuts and popcorn. Eve hates peanuts, so she picks out the popcorn and leaves the peanuts in the bowl. Based on this description, cracker jacks are a(n)

a)

atom

b)

element

c)

mixture

d)

compound

61.

Which of the following is the correct equation for PHOTOSYNTHESIS?

a)

CO2 + H2O --> O2 + Sugar

b)

O2 + H2O --> CO2 + Sugar

c)

CO2 + sugar + H2O --> O2

d)

CO2 + O2 + H2O --> Sugar

62.

The common name for sodium chloride (NaCl) is

a)

sugar

b)

salt

c)

road salt

63.

Baking Soda is the

a)

Common name

b)

Scientific name

c)

Chemical formula

64.

CaCO3 is the

a)

Common name

b)

Scientific name

c)

Chemical formula

65.

Ascorbic acid is the

a)

Common name

b)

Scientific name

c)

Chemical formula

66.

At higher temperatures

a)

particles in an have less energy

b)

particles are closer to each other

c)

particles move faster

67.

When ice melts and changes to water, it

a)

Gains heat

b)

Loses heat

c)

Changes temperature

68.

When water vapor is condensed to form water, it

a)

Gains heat

b)

Loses heat

c)

Changes temperature

69.

Particles in a ______________________ have more energy than the other states of matter.

a)

gas

b)

liquid

c)

solid

70.

The speed of the molecules determines the _____.

a)

volume

b)

pressure

c)

density

d)

temperature

71.

Which has a greater distance between particles?

a)

Solid

b)

Liquid

72.

A chemical change

a)

doesn't really change much.

b)

creates a new substance

c)

is a change in the state of matter

73.

A physical change is...

a)

a change that doesn't change the identity

b)

a change that makes something new.

c)

a chemical reaction

74.

__Na + __Cl2 --> __NaCl

a)

1,1,2

b)

2,1,2

c)

2,1,1

d)

already balanced

75.

__Al + __Fe3N2 -->__AlN + __Fe

a)

2,1,2,3

b)

4,2,4,6

c)

1,2,1,3

d)

already balanced

76.

____ CH4 + ____ O2 ---> ____ CO2 + ____ H2O

a)

2,1,3,1

b)

1,2,1,2

c)

1,2,2,1

d)

2,1,1,2

77.

____ GaF3 + ____ Cs ---> ____ CsF + ____ Ga

a)

1,1,3,1

b)

1,2,3,1

c)

2,3,3,1

d)

1,3,3,1

78.

How many Mn atoms are found in the following compound?

3Cr(MnO4)6

a)

3

b)

4

c)

6

d)

18

79.

Is the following equation balanced?...

Al + O2 --> 2Al2O3

a)

Yes

b)

No

80.

Element or compound?

H2O

a)

Element

b)

Compound

81.

Element or compound?

O2

a)

Element

b)

Compound

82.

Is the following equation balanced?

4Fe + 3O2 --> 2Fe2O3

a)

yes

b)

no

83.

If you have a material that can conduct electricity well it is probably a...

a)

Metalloid

b)

Metal

c)

Non-metal

84.

Unlike non-metals, most metals tend to —

a)

conduct electricity and heat well.

b)

be gases at room temperature.

c)

break easily when hammered.

d)

have less luster and shine.

85.

All of the following would classify an element as a metal except?

a)

Dull

b)

Malleable

c)

Luster

d)

Hard

86.

Is melting butter for popcorn a chemical or physical change?

a)

chemical

b)

physical

87.

Is corroding metal a chemical or physical change?

a)

physical

b)

chemical

88.

Which of the following characteristics is shared by all chemical reactions?

a)

Produce a precipitate

b)

Show a color change

c)

Release heat energy

d)

Form new substances

89.

A student added white crystals to a clear liquid. The crystals dissolved in the liquid. After a few seconds, the liquid became quite warm and then turned bright red in color. Indications that a chemical change was taking place could be observed when –

a)

the white crystals were added to the clear liquid.

b)

the crystals dissolved in the liquid leaving only the liquid visible.

c)

the temperature of the liquid increased and an unexpected color change occurred.

d)

There are no indications of chemical change

90.

Evidence that a reaction has occurred includes

a)

change of color

b)

formation of a precipitate

c)

release of gas bubbles

d)

all of these

91.

A student observes some sugar as it is heated and burns. The student concludes that a chemical reaction has occurred. Which of the following observations about the burning sugar provides evidence of a chemical reaction?

a)

Heat is added to the sugar crystals.

b)

The sugar melts and becomes a liquid.

c)

Gas is produced as the sugar turns black.

d)

No evidence of chemical reaction is present.

92.

An Element is a simple pure substance. It __________ be separated.

a)

Can

b)

Can not

93.

Are mixtures chemically combined?

a)

YES

b)

NO

94.

Carbon Dioxide (CO2) is an ELEMENT?

a)

True

b)

False

95.

Frying pans are usually made from non-metals because non-metals are good conductors of heat.

a)

True

b)

False

96.

In the modern periodic table elements are arranged by:

a)

atomic mass

b)

atomic number

c)

valence electrons

d)

alphabetical order

97.

How many Valance electrons does Iodine Have?

a)

5

b)

7

c)

17

d)

53

98.

How many shells does an Oxygen atom have?

a)

2

b)

6

c)

8

d)

16

99.

How many electrons fit in the first shell of a carbon atom?

a)

1

b)

2

c)

4

d)

6

100.

How many valence electrons does a Lithium atom have?

a)

1

b)

2

c)

3

d)

7

101.

In this picture, the Electrons are found in which color?

a)

Red

b)

Blue

c)

Green

102.

How many shells/levels does this atom have?

a)

1

b)

2

c)

3

d)

4

103.

Which Period would this element be found on just by looking at the shells/levels?

a)

1

b)

2

c)

3

d)

4

104.

The Atomic Theory states that:

a)

All elements are composed of atoms. Atoms cannot be divided or destroyed.

b)

Atoms of the same element are exactly alike.

c)

Atoms from different elements are different from each other.

d)

The atoms of two or more elements can join together to form types of matter called compounds.

105.

If an atom has 3 electrons, how many protons does it have?

a)

1

b)

2

c)

3

d)

4

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