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WorksheetsBalancing Chemical Reactions
Total questions: 15
Worksheet time: 8mins
Name
Class
Date
1.
Solve the problem: Al + O2 --> Al2O3
a)
4Al + 3O2 --> 2Al2O3
b)
2Al + 4O2 --> Al2O3
2.
Solve the problem: Al + S --> Al2S3
a)
Al + 2S --> 2Al2S3
b)
2Al + 3S --> Al2S3
3.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
4.
What is a closed system?
a)
A system in which energy does not travel freely.
b)
A system in which energy travels freely.
5.
What is a reactant?
a)
The chemical substances that begin the reaction.
b)
What comes from the reaction.
6.
Is this equation balanced?: CS2 + 202 --> CO2 +2SO2
a)
Yes
b)
No
7.
What is a yield?
a)
The arrow in an equation that represents the chemical reaction.
b)
The beginning substances.
8.
Solve the problem: N2 + O2 --> 2NO
a)
N2 + O2 --> 2NO
b)
2N2 + O2 --> 2NO
9.
A synthesis occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
10.
Which problem is balanced?
a)
PbO2 + 2H2
b)
So2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
11.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
12.
A replacement occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
13.
Decomposition occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
14.
What is an open system?
a)
A system in which energy does not travel freely.
b)
A system in which energy travels freely.
15.
What is a product?
a)
What's left of the chemical reaction.
b)
The beginning formulas.
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