WorksheetsBalancing Equations
Total questions: 33
Worksheet time: 44mins
Name
Class
Date
1.
Fill in the blanks with coefficient:
PCl5+ _ H2O → _ HCl + H3PO4
a)
4, 5
b)
1, 6
c)
3, 8
d)
2,2
2.
Balance this equation
_Zn + _HCl → _ZnCl2 + _H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
3.
Balance this equation
_N2 + _H2 → _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
4.
How many atoms of aluminum are on each side of the following equation:
4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
5.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
6.
N2 + H2 = NH4
a)
Balanced
b)
Unbalanced
7.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction.
8.
Name the part in red:
H2 + O2 -> H2O
H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Yield
d)
Subscript
9.
Name the part in red:
_2_H2 + _1_O2 -> _2_H2O
_2_H2 + _1_O2 -> _2_H2O
a)
Coefficient
b)
Product
c)
Yield
d)
Subscript
10.
Name the part in red:
H2 + O2 -> H2O
H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Reactant
d)
Subscript
11.
Name the part in red:
H2 + O2 -> H2O
H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Reactant
d)
Subscript
12.
Which number should go in the blank?
_ H2 + O2 -> 2 H2O
_ H2 + O2 -> 2 H2O
a)
1
b)
2
c)
3
d)
0
13.
Is this balanced?
Al + O2 → 2Al2O3
Al + O2 → 2Al2O3
a)
Yes
b)
No
14.
What is the arrow in a chemical equation...
H2 + O2 --> H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
15.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
16.
Balance this equation:
MgCl2 --> Mg4+ Cl2
MgCl2 --> Mg4+ Cl2
a)
It's already balanced.
b)
4MgCl2 --> Mg4+ 4Cl2
c)
4MgCl2 --> Mg4+ 5Cl2
17.
Balance this equation:
FeS + HCl --> FeCl2 + H2S
a)
FeS2 + 2HCl --> FeCl2 + H2S
b)
It's already balanced
c)
FeS + H2Cl2 --> FeCl2 + H2S
d)
None of these
18.
Balance this equation:
2Li + Cl2 -> LiCl
2Li + Cl2 -> LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
19.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
20.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
21.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
22.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
23.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
24.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
25.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
26.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
27.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
28.
What is the right part of a chemical equation called...
H2 + O2 --> H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
29.
Balance this equation...
H2 + Cl2 --> HCl
H2 + Cl2 --> HCl
a)
It is balanced
b)
3H2 + Cl2 --> 6H2Cl
c)
H2 + Cl2 --> 2HCl
d)
I don't know! Oh well.
30.
Balance this equation...
HgO --> 2Hg + O2
HgO --> 2Hg + O2
a)
It is balanced
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
d)
I don't know...Oh well!
31.
When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced
a)
charge
b)
subscript
c)
random number
d)
coefficient
32.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
33.
A sealed test tube containing 8 grams of iron filings and 5 grams of sulfur is heated until the material in the test tube glows bright red. What is the mass of products?
a)
Mass is less than 13 grams
b)
Mass is equal to 13 grams
c)
Mass is greater than 13 grams
d)
Mass cannot be measured
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