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WorksheetsBalancing Equations
Total questions: 25
Worksheet time: 35mins
Name
Class
Date
1.
What is the left part of a chemical equation called...
H2 + O --> H2O
H2 + O --> H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
2.
Balance this equation:
2Li + Cl2 -> LiCl
2Li + Cl2 -> LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
3.
Read the following chemical formula: C6H12O6. How many hydrogen atoms are in the formula?
a)
12
b)
6
c)
4
4.
According to the law of conservation of mass, if 5 grams of Oxygen completely reacted with 10 grams of Hydrogen, how many grams of water should be produced?
a)
5g
b)
10g
c)
15g
d)
20g
5.
PCl5 + ___ H2O → ___ HCl + H3PO4
a)
4, 5
b)
1, 6
c)
3, 8
d)
2,2
6.
__ Al + __ FeO → Al2O2 + __ Fe
a)
1, 1, 2
b)
2,1,2
c)
2, 2, 2
d)
2,4,2
7.
Mg + ___ HCl → MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
8.
Which side of a chemical equation os the product side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
9.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
10.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
11.
Balance this equation-
__P4 + __O2 --> __P2O3
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
12.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2
13.
Balance this equation
_N2 + _H2 --> _NH3
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
14.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
15.
Balance this equation.
_SnO2 +_H2-->_Sn +_H2O
_SnO2 +_H2-->_Sn +_H2O
a)
1,1,2,1
b)
1,2,1,1
c)
1,2,1,2
d)
1,2,2,1
16.
Balance this equation-
_SeCl6+_O2>_SeO2+_Cl2
_SeCl6+_O2>_SeO2+_Cl2
a)
1,2,1,2
b)
1,1,1,3
c)
1,2,1,1
d)
2,1,1,1
17.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
18.
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
19.
What is the arrow in a chemical equation...
H2 + O --> H2O
H2 + O --> H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
20.
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
21.
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.
22.
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
23.
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
24.
What is the balanced equation for:
__ KNO₃ + __ H₂CO₃ → __ K₂CO₃ + __ HNO₃
__ KNO₃ + __ H₂CO₃ → __ K₂CO₃ + __ HNO₃
a)
2 KNO₃ + H₂CO₃ → K₂CO₃ + 2 HNO₃
b)
KNO₃ + H₂CO₃ → K₂CO₃ + HNO₃
c)
2 KNO₃ + 2 H₂CO₃ → K₂CO₃ + 2 HNO₃
d)
2 KNO₃ + 2 H₂CO₃ → K₂CO₃ + 3 HNO₃
25.
What is the balanced equation for:
__ KOH + __ H₃PO₄ → __ K₃PO₄ + __ H₂O?
__ KOH + __ H₃PO₄ → __ K₃PO₄ + __ H₂O?
a)
3 KOH + H₃PO₄ → K₃PO₄ + 3 H₂O
b)
3 KOH + 2 H₃PO₄ → 3 K₃PO₄ + 3 H₂O
c)
KOH + H₃PO₄ → K₃PO₄ + 6 H₂O
d)
2 KOH + H₃PO₄ → K₃PO₄ + H₂O
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