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WorksheetsModule 7: Chemical Reactions & Balancing Equations
Total questions: 15
Worksheet time: 29mins
Name
Class
Date
1.
__Na + __Cl2 --> __NaCl
a)
1,1,2
b)
2,1,2
c)
2,1,1
d)
already balanced
2.
Balance this equation:
MgCl2 --> Mg4+ Cl2
MgCl2 --> Mg4+ Cl2
a)
It's already balanced.
b)
4MgCl2 --> Mg4+ 4Cl2
c)
4MgCl2 --> Mg4+ 5Cl2
3.
Is the following equation balanced or unbalanced?
Fe + S --> FeS
Fe + S --> FeS
a)
balanced
b)
unbalanced
4.
When balancing equations what does
-->
mean?
-->
mean?
a)
subscript
b)
equals
c)
it is just an arrow
d)
yield
5.
What is the part of the chemical equation in green called?
Fe + S --> FeS
Fe + S --> FeS
a)
products
b)
reactants
c)
yield
d)
chemical formula
6.
___________________ are the elements or compounds that are formed in a chemical
reaction.
reaction.
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
7.
How many HCl molecules do you need to balance this equation?
Mg + __HCl ---> MgCl2 + H2
Mg + __HCl ---> MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
8.
What law governs the balancing of chemical equations?
a)
Law of Energy
b)
Law of Conservation of Matter/Mass
c)
Law of Gravity
d)
Law of Matter Movement
9.
What are the smaller numbers that you CANNOT change in a chemical equation?
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscript
10.
What are the larger numbers that you CAN CHANGE in a chemical equation?
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscripts
11.
How many Iron (Fe) atoms are in this chemical formula?
a)
2 iron atoms
b)
6 iron atoms
c)
5 iron atoms
d)
4 iron atoms
12.
What physical state symbol should be included for oxygen?
a)
(s) - solid
b)
(l) - liquid
c)
(g) - gas
d)
(aq) - aqueous
13.
Balance the following:
____ Fe + ____ Cl2 → ____ FeCl3
a)
1,1,2
b)
1,3,1
c)
2,2,3
d)
2,3,2
14.
Which type of reaction is:
2 NaBr + Ca(OH)2 → CaBr2 + 2 NaOH
a)
Synthesis
b)
Single Displacement
c)
Double Displacement
d)
Combustion
15.
Which type of reaction is:
3 Pb + 2 H3PO4 → 3 H2 + Pb3(PO4)2
a)
Synthesis
b)
Single Displacement
c)
Double Displacement
d)
Combustion
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