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8th Grade Exam 1

Total questions: 87

Worksheet time: 2hrs 35mins

Name
Class
Date
1.
How do covalent bonds form?
a)
Donating & receiving valence e- between atoms.
b)
Opposite slight charges attract each other between compounds.
c)
Scientists are still not sure how they form.
d)
Sharing valence e- between atoms.
2.
What do we call a covalent bond where electrons are shared UNEVENLY or UNEQUALLY?
a)
Ionic
b)
Polar Covalent
c)
Nonpolar Covalent
d)
Van der Waals Force
3.
What type of bond is shown in this image?
a)
Ionic
b)
Polar Covalent
c)
Nonpolar Covalent
d)
Van der Waals Force
4.

Ionic bonds form between ---

a)

nonmetals.

b)

metals and nonmetals.

5.

Covalent bonds form between ---

a)

nonmetals.

b)

metals and metals

c)

metals and nonmetals

6.

What are valence electrons?

a)

sum of the protons and neutrons

b)

protons minus electrons

c)

electrons in the inner shells

d)

electrons in the outer shell

7.

Atoms that gain an electron have an electric charge of ---

a)

-1.

b)

-2.

c)

+1.

d)

+2.

8.

If an atom has 7 protons and 7 electrons, its electric charge is ---

a)

-7

b)

-14

c)

0

d)

+7

9.

Atoms form compounds to become more ---

a)

reactive

b)

stable

c)

explosive

d)

toxic

10.

Atoms gain lose, gain, or ______electrons to get a stable outer energy level.

a)

share

b)

split

c)

create

d)

destroy

11.

A _______ is the force that holds atoms together in a compound.

a)

Chemical Formula

b)

Chemical Reaction

c)

Chemical Bond

d)

Synthesis Reaction

12.

Why do chemical bonds form?

a)

so the number of protons equals the number of electrons

b)

to fill the outermost electron level

c)

so an atom can become unstable

13.

An electron has a ___ charge.

a)

no charge

b)

positive

c)

negative

d)

it depends

14.

A proton has a ___ charge.

a)

positive

b)

negative

c)

no charge

d)

it depends

15.

According to the Octet Rule, atoms of elements react with each other in order to attain ____ electrons in their outermost energy level or shell.

a)

2

b)

4

c)

8

d)

10

16.

An atom of Neon complies with the Octet Rule because it has ___ electrons in its outer shell.

a)

10

b)

8

c)

2

d)

7

17.
a)
2
b)
8
c)
3
d)
13
18.

How many valence electrons does carbon have?

a)

4

b)

5

c)

6

d)

7

19.

USE THE PERIODIC TABLE

How many valence electrons does Phosphorus have?

a)

31

b)

5

c)

15

d)

4

20.
How many valence electrons are in an atom of Ar?
a)
2
b)
8
c)
4
d)
1
21.
How many valence electrons are found in atoms of group 1?
a)
7
b)
6
c)
4
d)
1
22.
How many Valance electrons does Iodine Have?
a)
6
b)
16
c)
7
d)
17
23.
Rows on the period table are called _____ while columns are called _____.
a)
groups, families
b)
groups, periods
c)
periods, groups
d)
families, groups
24.

The period that an element is in, tells you what?

a)

Number of protons

b)

Number of electrons

c)

Number of valence electrons

d)

Number of shells

25.

A substance that is formed as the result of a chemical reaction is a __________________

a)

Product

b)

Reactant

c)

Starters

d)

Enders

26.

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

a)

water freezes to form ice

b)

sugar dissolves in water

c)

gasoline burns in a car engine

d)

a piece of metal expands when it is heated

27.

A change in the shape of an object is an example of _________________.

a)

a chemical change

b)

energy

c)

an endothermic change

d)

a physical change

28.
Which of the following is an example of a chemical change?
a)
rusting of a bicycle
b)
painting a house
c)
washing a dog
d)
tearing up a newspaper
29.

Which one shows that a chemical reaction has occurred?

a)

dissolving

b)

melting

c)

formation of a gas

d)

bending

30.
Which of the following IS a physical change?
a)
Getting a haircut
b)
Rusty metal
c)
sour milk
d)
A compound
31.
What type of change occurs when a new substance is formed that has different properties from the original substances?
a)
chemical change
b)
nuclear change
c)
physical change
d)
mutation
32.
a copper penny turning greenish after a few years.
a)
Chemical Change
b)
Physical Change
33.
In a ___________change, a substance changes into a different substance.
a)
Physical
b)
Chemical
34.

What is the BEST definition of a chemical reaction?

a)

A change in matter that produces one or more NEW substances

b)

When two things combine and EXPLODE.

35.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
36.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
37.
Element or compound?
H2O
a)
element
b)
compound
38.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
39.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
40.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
41.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
42.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
43.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
44.
The blue atoms are called 
a)
metals
b)
nonmetals
c)
metalloids
d)
noble gases
45.
The atoms along the staircase are called 
a)
metals
b)
nonmetals
c)
metalloids
d)
noble gases
46.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
47.
In this image, the symbols to the right of the arrow (in black) are called the_______.
a)
Products
b)
Reactants
c)
Subscripts
d)
Coefficients
48.
Na + MgF2 -->  NaF + Mg
What are the reactants?
a)
Na + MgF2
b)
Na
c)
NaF + Mg
d)
NaF
49.
NH3 ---> N2 + H2
What are the products?
a)
N2 + H2
b)
N2
c)
H2
d)
NH3
50.
All of the following are chemical changes except
a)
iron rusting
b)
water evaporating
c)
wood burning
d)
food rotting
51.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)
The shape of the coal changes
b)
Oxygen is present
c)
A new substance is produced
d)
Coal is made up of more than one element
52.

Which of the following best represents the Law of Conservation of Energy?

a)

Energy CAN be created but NOT destroyed

b)

Energy CAN be destroyed but NOT created

c)

Energy can NOT be created Nor destroyed

d)

Energy CAN be created and CAN destroyed

53.
Measure of the amount of matter 
a)
mass
b)
volume
c)
weight
d)
density
54.

What is the atomic mass of Neon?

a)

10

b)

20.18

c)

10.18

d)

20

55.
How many protons are in Beryllium?
a)
4
b)
9
c)
5
d)
2
56.

What is the atomic mass of Copper?

a)

63.546

b)

29

c)

29.546

d)

92

57.
How many neutrons are in a Gold atom?
a)
79
b)
196
c)
118
d)
275
58.

How many electrons does a Copper atom have?

a)

63

b)

29

c)

92

d)

34

59.

What is the atomic mass of Gold?

a)

79

b)

196.97

c)

79.97

d)

275

60.

What is the atomic mass of Helium

a)

4.0026

b)

2.0026

c)

4

d)

1

61.

What is the atomic mass of Hydrogen?

a)

1.008

b)

2

c)

1

d)

0

62.

How many neutrons does a Hydrogen atom have?

a)

1

b)

2

c)

3

d)

0

63.

How many electrons does an Iodine atom have?

a)

53

b)

126

c)

73

d)

179

64.

What is the atomic weight of Iron?

a)

26

b)

55.845

c)

56

d)

30

65.

How many electrons does an atom of Krypton have?

a)

36

b)

83.798

c)

47.798

d)

119.798

66.

What does the topmost number (3) represent?

a)

Mass Number

b)

Atomic Number

c)

Atomic Mass

d)

Number of Neutrons

67.

How many electrons does a Hydrogen atom have?

a)

1

b)

2

c)

3

d)

0

68.

How many electrons are in Aluminium?

a)

40

b)

27

c)

13

d)

14

69.

How many protons are in Silicon?

a)

7

b)

42

c)

28

d)

14

70.

The smallest piece of an element:

a)

quark

b)

electron

c)

shell

d)

atom

71.

The cloud-like space that electrons travel around:

a)

nucleus

b)

shell

c)

neutrons

d)

Oort cloud

72.

Protons and neutrons are found in the center of the atom called the:

a)

nucleus

b)

neutron

c)

shell

d)

cell

73.

The subatomic particles are called:

a)

protons, nucleus and electrons

b)

protons, electrons and neutrons

c)

protons, positives and negatives

d)

cloud, shell and quarks

74.

Substances that have only one kind of atom are called:

a)

elements

b)

nitrogen

c)

electrons

d)

nucleus

75.

Electrons have a _____ charge.

a)

neutral

b)

negative

c)

positive

d)

both positive and negative

76.

What is the study of matter?

a)

Chemistry

b)

Biology

c)

Earth Science

d)

Physics

77.

The abbreviation for an element:

a)

element name

b)

atomic number

c)

chemical symbol

d)

atomic symbol

78.

Who invented the simplified version of the atom?

a)

Dmitri Mendeleev

b)

Niels Bohr

c)

Sir Isaac Newton

d)

Albert Einstein

79.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
80.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
81.
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. 
82.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
83.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
84.
Balance this equation-
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
85.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
86.
When the equation
Na + H2O --> NaOH + H2 is correctly balanced using the smallest whole numbers, the coefficient of the water is
a)
1
b)
2
c)
3
d)
4
87.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2

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