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Chemistry Unit Test 8th-grade

Total questions: 68

Worksheet time: 35mins

Name
Class
Date
1.

A combination of 2 or more substances that DO NOT form a new substance is called a ________.

a)

compound

b)

molecule

c)

mixture

d)

element

2.

Which of the following chemical formulas represents a compound? (assume that the numbers are all subscripts

a)

C3

b)

O2

c)

CH3CHO

d)

H2

3.

If an atom has 7 protons and 7 electrons what charge will it have?

a)

-2

b)

-1

c)

0

d)

+1

e)

+2

4.

If an atom gains two electrons what charge will it have?

a)

-2

b)

-1

c)

0

d)

+1

e)

+2

5.

Which of the following describes covalent bonds?

a)

Bonds form because of opposite charges

b)

Electrons are transferred between atoms

c)

Electrons are shared to fill outer electron shells

d)

Covalent bonds are magical

6.

If an atom loses two electrons what charge will it have?

a)

-2

b)

-1

c)

0

d)

+1

e)

+2

7.

Which of the following describes covalent bonds?

a)

Bonds form because of opposite charges

b)

Electrons are transferred between atoms

c)

Electrons are shared to fill outer electron shells

d)

Covalent bonds are magical

8.

What kind of bond forms when atoms exchange electrons?

a)

ionic

b)

artificial

c)

covalent

d)

univalent

9.

What is the name for an ion with a negative charge?

a)

onion

b)

anion

c)

cation

d)

union

10.

Which of the following cannot be broken down into something simpler?

a)

A molecule

b)

A compound

c)

An element

d)

A mixture

11.

What is the name for an ion with a positive charge?

a)

onion

b)

anion

c)

cation

d)

union

12.

Covalent bonds are between...

a)

metals and metals

b)

two or more nonmetals

c)

sodium and chloride

d)

metals and nonmetals

13.

Ionic bonds are between...

a)

nonmetals and nonmetals

b)

carbon and oxygen

c)

metals and metals

d)

metals and nonmentals

14.

Which one can be found on the periodic table?

a)

compound

b)

element

15.

This diagram represents...

a)

An element

b)

A molecule

c)

A compound

d)

A mixture of elements and compounds

16.

The vertical (up and down) columns in the Periodic Table are called

a)

groups

b)

towers

c)

periods

d)

atomic numbers

17.
The Modern Periodic Table of Elements is arranged by
a)
atomic mass
b)
atomic number
c)
valence electrons
d)
number of isotopes
18.
Which group of the periodic table is composed of inert (not reactive)  gases?
a)
alkali metals
b)
alkaline earth metals
c)
halogens
d)
noble gases
19.
Elements in a ..................have similar chemical properties.  
a)
period
b)
group
c)
row
20.
GOLD
a)
Al
b)
Ag
c)
Ar
d)
Au
21.

Where is most of the mass of an atom located?

a)

the nucleus

b)

the electron cloud

c)

the space in between particles

d)

in shells

22.

What are the positively charged particles in an atom called?

a)

Electrons

b)

Neutrons

c)

Protons

d)

none of these

23.

Which particle in the atom is neutrally (neither positive or negative) charged?

a)

Proton

b)

Electron

c)

Neutron

d)

Negatron

24.

What two particles would you find in the nucleus of an atom?

a)

Protons and electrons

b)

Neutrons and electrons

c)

Protons and neutrons

d)

Electrons and negatrons

25.

The smallest unit of an element that retains or keeps the properties of that element is called

a)

A molecule

b)

An atom

c)

A proton

d)

A neutron

26.

The amount of _________ an atom has determines the name of the element.

a)

protons

b)

neutrons

c)

particles

d)

elements

27.

Mass number is ______.

a)

number of protons + electrons

b)

number of neutrons + protons

c)

number of electrons only

d)

number of neutrons only

28.

Isotopes are _______.

a)

elements with the same atomic number and same mass

b)

elements with different atomic number but same mass

c)

elements with same atomic number but different masses

d)

different elements with same number of electrons

29.

The cloud-like space that electrons travel around:

a)

nucleus

b)

shell

c)

neutrons

d)

Oort cloud

30.

Classification system for elements is called:

a)

Elements

b)

Periods

c)

The Periodic Table of Elements

d)

Families

31.

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

32.

What is the study of matter?

a)

Chemistry

b)

Biology

c)

Earth Science

d)

Physics

33.

All matter is made of _____.

a)

light

b)

energy

c)

cells

d)

atoms

34.

The electrons in the outermost shell (main energy level) of an atom; these are the electrons involved in forming bonds

a)

alkali metals (group 1)

b)

Halogens (Group 17)

c)

atomic number

d)

valence electrons

35.

How many valence electrons and energy levels does (Pb) lead have?

a)

4 valence electrons and 6 energy levels (orbitals)

b)

6 valence electrons and 4 energy levels (orbitals)

c)

5 valence electrons and 5 energy levels (orbitals)

d)

5 valence electrons and 10 energy levels (orbitals)

36.

What is the atomic mass?

a)

58.693

b)

28

37.

How many protons and electrons does nickel have?

a)

28

b)

58.69

38.

How many valence electrons does the element have?

a)

1

b)

2

c)

3

d)

4

39.

What do the vertical columns on the periodic table tell us?

a)

The number of orbitals

b)

The number of valence electrons (electrons on the outer most shell)

40.

Sodium (Na) is found in group __________.

a)

1

b)

2

c)

3

d)

4

41.

What information does the subscript tell us in a chemical formula?

a)

Amount of molecules

b)

Amount of elements

c)

Amount of compounds

42.

What information does the coefficient tell us in an chemical formula?

a)

Amount of molecules

b)

Amount of atoms

c)

Amount of elements

43.

What is the coefficient in this chemical formula:


3H2O

a)

1

b)

2

c)

3

d)

4

44.

ZnSO4: Identify the types of atoms.

a)

Zinc

b)

Sulfur

c)

Oxygen

d)

Silicon

e)

Potassium

45.

C4H8O: How many types of atoms?

a)

4

b)

8

c)

12

d)

3

46.

True or False: All atoms are created or destroyed in a chemical reaction.

a)

true

b)

false

c)

maybe

47.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
48.
A change where one or more new substances are created.
a)
Physical Change 
b)
Chemical Change 
49.
Fizzing, foaming, and burning are all examples of
a)
Chemical change
b)
Physical change
50.
Which of these is a result of a chemical change?
a)
A mixture
b)
A solution
c)
A new substance
d)
Melting or freezing
51.
Ice melting
a)
Chemical Change
b)
Physical Change
52.
Wood burned in a fireplace
a)
Chemical Change
b)
Physical Change
53.
Boiling water
a)
Chemical Change
b)
Physical Change
54.
a)
Physical Change
b)
Chemical Change
55.
a)
Physical Change
b)
Chemical Change
56.
a)
Physical Change
b)
Chemical Change
57.
a)
Physical Change
b)
Chemical Change
58.
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
59.
A chemical reaction is balanced when
a)
both sides have the same elements
b)
Both sides have the same  number of atoms
c)
Same subscripts
d)
Same coefficients
60.
A precipitate is a 
a)
liquid that forms when two solids are reacted
b)
a solid that forms when two liquids are mixed
c)
a gas that forms when vinegar and baking soda react
d)
a change of color in a solution
61.
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
62.

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

a)

Originator

b)

Reactant

c)

Product

d)

Produce

63.

Law of conservation of mass states the amounts of atoms in the reactants and the products...

a)

Increase

b)

Decrease

c)

Stay the same

d)

No correct answer

64.

Does the equation H2+O2 →H2O follow the Law of Conservation of Mass?

a)

Yes, because the atoms are equal.

b)

No, because more info is needed.

c)

No, because there are more atoms in the product.

d)

No, because there are more atoms in the reactant.

65.
a)

Element

b)

Compound

c)

Mixture

66.
a)

Element

b)

Compound

c)

Mixture

67.
a)

Element

b)

Compound

c)

Mixture

68.
a)
Element
b)
Compound
c)
Mixture

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