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WorksheetsBalancing Chemical Equations (informal assessment)
Total questions: 10
Worksheet time: 14mins
Name
Class
Date
1.
CaCO3 represents a chemical…
a)
symbol
b)
formula
c)
subscript
d)
reaction
2.
How many atoms are represented in the formula CaCO3?
a)
four
b)
three
c)
five
d)
six
3.
In chemical reactions, what does the principle of conservation of mass mean?
a)
The total mass of the reactants is greater than the total mass of the products.
b)
Matter is not changed.
c)
Matter is not created or destroyed.
d)
The total mass of the reactants is less than the total mass of the products.
4.
Which of the following is a balanced chemical equation?
a)
2Mg + HCl --> MgCl2 + H2
b)
H2O2 --> H2O + O2
c)
SO2 + O2 + 2H2O --> 4H2SO4
d)
2Fe2O3 + 3C --> 4Fe + 3CO2
5.
Which of the following usually increases the rate of a reaction?
a)
adding an inhibitor
b)
decreasing the concentration of the reactants
c)
lowering the temperature
d)
grinding a solid reactant into a powder
6.
Which is the correct balanced chemical equation for the following statement? Sodium reacts with Oxygen to produce Sodium oxide.
a)
Na2O + O2 --> 2Na
b)
Na2 + O2 --> 2NaO
c)
Na2O --> 2Na + O2
d)
4Na + O2 --> 2Na2O
7.
Determine the balanced equation for each of the following:
H2 + O2 --> H2O
H2 + O2 --> H2O
a)
H2 + O2 --> 2H2O
b)
2H2 + O2 --> 2H2O
c)
H2 + O2 --> H2O2
d)
H2 + 2O2 --> 2H2O
8.
Determine the balanced equation for each of the following:
F2 + KCl --> KF + Cl2
F2 + KCl --> KF + Cl2
a)
F2 + KCl --> KF + Cl2
b)
F2 + KCl2 --> KF2 + Cl2
c)
F2 + 2KCl --> 2KF + Cl2
d)
F2 + 2KCl --> KF + Cl2
9.
Determine the balanced equation for each of the following:
Al + HCl --> AlCl3 + H2
Al + HCl --> AlCl3 + H2
a)
Al + HCl --> AlCl3 + H2
b)
Al + 3HCl --> AlCl3 + 3H2
c)
Al + 3HCl --> AlCl3 + H2
d)
2Al + 6HCl --> 2AlCl3 + 3H2
10.
Determine the balanced equation for each of the following:
C2H6O + O2 --> CO2 + H2O
C2H6O + O2 --> CO2 + H2O
a)
C2H6O + 3O2 --> 2CO2 + H2O
b)
C2H6O + O2 --> CO2 + H2O
c)
C2H6O + 3O2 --> 2CO2 + 3H2O
d)
2C2H6O + 3O2 --> 2CO2 + 3H2O
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