Font size
S
M
L
XL
WorksheetsUnit 3 Test Review
Total questions: 40
Worksheet time: 32mins
Name
Class
Date
1.
Is bleaching your hair a physical or chemical change?
a)
physical
b)
chemical
2.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
3.
What characteristic defines all chemical changes?
a)
There is a change in state of matter.
b)
Electricity is produced.
c)
A new substance is formed.
d)
Bubbles are produced.
4.
Which is a physical change?
a)
burning match
b)
vinegar in baking soda
c)
melting butter
d)
cooking an egg
5.
Changing the Shape, State, or Size of an object is a...
a)
Physical Change
b)
Chemical Change
c)
Chemical Property
6.
Balance this equation-
__P4 + __O2 --> __P2O3
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
7.
Balance this equation-
_SeCl6+_O2>_SeO2+_Cl2
_SeCl6+_O2>_SeO2+_Cl2
a)
1,2,1,2
b)
1,1,1,3
c)
1,2,1,1
d)
2,1,1,1
8.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
9.
Decomposition occurs when...
a)
Two formulas combine.
b)
A compound breaks apart.
c)
An atom is replaced during a reaction.
d)
2 atoms are replaced during a reaction
10.
A synthesis occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
d)
two atoms are being replaced during a reaction.
11.
How would this equation be classified?
O2 + 2H2 --> 2H2O
O2 + 2H2 --> 2H2O
a)
Synthesis
b)
Decomposition
c)
Combustion
d)
Single Displacement
12.
Mg + HCl --> MgCl2 + H2
a)
Single Displacement
b)
Double
c)
Combustion
d)
Synthesis
13.
HgO --> Hg + O2
a)
Synthesis
b)
Decomposition
c)
Single
d)
Combustion
14.
C6H12 + 9O2 --> 6CO2 + 6H2O
a)
Synthesis
b)
Single Displacement
c)
Combustion
d)
Decomposition
15.
The substances at the beginning of a chemical reaction are called the ____
a)
products
b)
yield
c)
chemical symbol
d)
reactants
16.
___________________ are the elements or compounds that are formed in a chemical reaction.
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
17.
Forms hydroxide ions (OH-) in water
a)
Acids
b)
Bases
c)
All
18.
Which is the stronger acid?
a)
pH 1
b)
pH 4
c)
pH 8
d)
pH 13
19.
Bases turn litmus paper _____
a)
red
b)
blue
c)
yellow
d)
green
20.
Which of the following is evidence of a chemical reaction?
a)
fizzing
b)
water changing to ice
c)
saltwater
d)
paper being cut in half
21.
Acids turn litmus paper ________
a)
red
b)
blue
c)
yellow
d)
green
22.
Identify the reaction: 3 AgNO3 + K3PO4 --> Ag3PO4 + 3 KNO3
a)
Synthesis reaction
b)
Single replacement reaction
c)
Double replacement reaction
d)
Combustion
23.
If the pH of a solution is 9, it is a....
a)
acid
b)
base
c)
both
d)
none
24.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
25.
what is an example of exothermic?
a)
firework
b)
ice pack
c)
melting icecream
d)
wood
26.
Is mixing lemonade powder with water a physical or chemical change?
a)
physical
b)
chemical
27.
Do reactants in an endothermic reaction have a higher or lower energy than the products?
a)
Higher
b)
Lower
28.
Do the reactants in an exothermic reaction have a higher or lower energy than the products?
a)
Higher
b)
Lower
29.
During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______.
a)
Warm
b)
Cold
30.
Rank the following pHs in order of increasing hydrogen (H+) concentration
a)
5, 7, 2,9
b)
9,12,13,14
c)
6,4,2,0
d)
4,1,7,14
31.
What is the name of the reaction that counteracts the effects of an acid?
a)
Combustion
b)
Synthesis
c)
Decomposition
d)
Neutralization
32.
What are the clues that a chemical reaction took place?
a)
change in color
change in temperature
bubbles
solid forms
change in temperature
bubbles
solid forms
b)
stirring
surface area
change in temperature
surface area
change in temperature
c)
adding a catalyst
concentration
surface area
concentration
surface area
d)
change in size
change in shape
state of matter change
change in shape
state of matter change
33.
How can you neutralize an acid?
a)
by adding water to dilute it
b)
by adding an acid
c)
by adding a base
d)
by adding a catalyst
34.
Which equation shows conservation of atoms?
a)
CH₄+O₂------CO₂+2H₂O
b)
H₂+O₂-----2H₂O₄
c)
4Al+3O₂-----2Al₂O₃
d)
Fe + Br -----FeBr3
35.
If you increase the surface area, what will happen to the rate of the reaction?
a)
it also increases
b)
it decreases
c)
it stays the same
36.
What is true of this reaction?
a)
Equal amounts of energy were released and absorbed
b)
The reaction released more energy than it absorbed
c)
The reaction absorbed more energy than it released
d)
This is an exothermic reaction
e)
This is an endothermic reaction
37.
Which of the following substances would have the greatest concentration of H+ ions?
a)
Ammonia with
pH 13
pH 13
b)
Water with
pH 7
pH 7
c)
Milk with
pH 5
pH 5
d)
Lemon juice with
pH 2
pH 2
38.
What type of reaction is this and what happens to its energy?
a)
Absorbs energy
b)
Release energy
c)
Cannot be determine
d)
exothermic reaction
e)
endothermic reaction
39.
what equation matches the word version of this chemical reaction:
calcium reacts with chlorine gas to produce calcium chloride
a)
Ca + Cl ---> CaCl
b)
Ca + Cl ----> CaCl2
c)
Ca + Cl2 ---> CaCl2
d)
C + Cl ----> Ca2Cl
40.
Which statement describes the type of change and the chemical properties before and after the reaction?
a)
This is a physical change with the same chemical properties before and after the reaction.
b)
This is a chemical change with the same chemical properties before and after the reaction.
c)
This is a physical change with different chemical properties before and after the reaction
d)
This is a chemical change with different chemical properties before and after the reaction.
Reset
