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WorksheetsBalancing Chemical Equations
Total questions: 25
Worksheet time: 41mins
Name
Class
Date
1.
What is the Law of Conservation of Mass?
a)
It states that no matter can be created or destroyed.
b)
It states that no energy can be created or destroyed.
c)
It states that matter can be created or destroyed.
d)
It states that no sound can be created or destroyed.
2.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number in front of a chemical formula.
c)
The number in between the chemical symbols.
d)
The number behind a chemical formula.
3.
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
4.
What is the little number after an element in a chemical equation called.
Example: H2
Example: H2
a)
Coefficient
b)
Subscript
c)
Atom
d)
Equation
5.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO
N2+O2--> _NO
a)
1
b)
2
c)
3
d)
4
6.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
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.
Is this balanced?
Al + O2 → 2Al2O3
Al + O2 → 2Al2O3
a)
Yes
b)
No
9.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
10.
Chemical Equation
a)
A representation of a chemical reaction
b)
the starting materials in a chemical reaction
c)
the new substances that are formed in a chemical reaction
d)
tells how many atoms, molecules, or formula units take part in a reaction
11.
The Law of Conservation of Matter
a)
tells how many atoms of an element are contained in one molecule or formula unit.
b)
the starting materials in a chemical reaction
c)
the new substances that are formed in a chemical reaction
d)
A law stating that atoms are not created or destroyed during a chemical reaction.
12.
How many Oxygens are in this molecule?
(OH)2
(OH)2
a)
4
b)
1
c)
2
d)
3
13.
__Na + O2 -----> __Na2O
Type of reaction?
Balance it too. :)
Type of reaction?
Balance it too. :)
a)
Synthesis, 2Na / 4Na2O
b)
Decomposition, 4Na / 2Na2O
c)
Synthesis, 4Na / 2Na2O
d)
Decomposition, 2Na / 4Na2O
14.
What type of reaction is this?
__H2O2 ----> __H2O + O2
__H2O2 ----> __H2O + O2
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Combustion
15.
Balance the following equation:
___ Mg+ ___ O2→___ MgO
a)
1, 1, 3
b)
2, 1, 2
c)
1, 2, 1
d)
2, 2, 2
16.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__H2 + __S --> __H2S
a)
1,1 --> 1
b)
2,2 --> 2
c)
1,2 --> 1
d)
1,2 --> 2
17.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__Al + __O2--> __Al2O3
a)
4,1 --> 2
b)
4,3 --> 4
c)
3,4 --> 1
d)
4,3 --> 2
18.
Mg + ___ HCl → MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
19.
Balance this equation:
2Li + Cl2 -> LiCl
2Li + Cl2 -> LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
20.
In a chemical reaction, the arrow stands for what?
a)
reactants
b)
yields or makes
c)
products
d)
Ask Pawan, he knows
21.
4Si + S8 --> 2Si2S4
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Double displacement
22.
3Mg + N2 --> Mg3N2
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Combustion
23.
2NO2 --> N2 + 2O2
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Combustion
24.
One reactant into several products.
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
25.
One element replaces another in a compound.
a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
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