WorksheetsChemistry Unit Review
Total questions: 21
Worksheet time: 11mins
Name
Class
Date
1.
A change in temperature and color of a substance during a science experiment means that what took place?
a)
Physical Change
b)
Chemical Change
2.
When different elements combine to make a compound, what happens?
a)
The elements stay the same, just joined up.
b)
They become a new substance with new properties!
3.
Given the following compound, how many oxygen atoms are there? H2OAl3
a)
1
b)
2
c)
3
d)
6
4.
If elements have the same number of valence electrons, they are in the same...
a)
Period
b)
Group
c)
Team
d)
Table
5.
Groups are vertical columns in the periodic table and share...
a)
the same number of protons
b)
similar physical and chemical properties
c)
the same number of neutrons
d)
the same atomic mass
6.
Reactive elements have...
a)
large atomic mass
b)
nuclear properties
c)
only a few valence electrons
d)
a full outer electron shell
7.
Which atomic particle has NO charge?
a)
Proton
b)
Neutron
c)
Electron
8.
Which atomic particle has a NEGATIVE charge?
a)
Proton
b)
Neutron
c)
Electron
9.
How many grams of Calcium Carbonate are present in order for this reaction to be balanced?
a)
63 g
b)
40 g
c)
80 g
d)
77 g
10.
How many different elements are involved in this chemical reaction: Br4H2N + Al5 --> 2AlHBr2 + Al3N
a)
9
b)
4
c)
6
d)
1
11.
In order for a substance to be organic, is must have...
a)
OXYGEN (O)
b)
CARBON (C)
c)
NITROGEN (N)
d)
CALCIUM (Ca)
12.
Which of the following substances is organic?
a)
H2O
b)
3BrN
c)
C3O2
d)
Ca4Al
13.
How many atoms of each element are found in this compound? C2H3N5C
a)
2 Carbon, 3 Hydrogen, 5 Nitrogen
b)
1 Carbon, 2 Hydrogen, 3 Nitrogen
c)
3 Carbon, 3 Hydrogen, 5 Nitrogen
14.
Ice breaking, chocolate melting and sugar dissolving are examples of...
a)
chemical changes
b)
physical changes
15.
Which element has 10 protons?
a)
Carbon
b)
Neon
c)
Hydrogen
d)
Oxygen
16.
Where is the mass found in an atom?
a)
Electron Clouds
b)
Nucleus
17.
How many electrons does Lithium have?
a)
1
b)
2
c)
3
d)
4
18.
What has properties of both metals and nonmetals?
a)
Noble Gases
b)
Metalloids
c)
Halogens
d)
Acids
19.
When a gas is produced during a science experiment, which occurred?
a)
Physical change
b)
Chemical reaction
20.
Metalloids are located where on the Periodic Table?
a)
Far Left
b)
Far Right
c)
Bottom
d)
Along the stair step between the metals and non-metals
21.
Which of the following is a COMPOUND?
a)
CO2
b)
Na
c)
Br3
d)
Li2
100 %
