WorksheetsBalancing Chemical Equations
Total questions: 40
Worksheet time: 3hrs 20mins
Name
Class
Date
1.
Chemical Reaction
a)
a substance formed as a result of a chemical reaction
b)
a change in matter that produces one or more new substances
c)
the process in which substances undergo chemical changes that result in the formation of new substances
d)
a substance that enters into a chemical reaction
2.
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.
3.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
yes
b)
no
4.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
a)
2,6,3,2
b)
it's already balanced
c)
4,12,3,4
d)
2,1,4,5
5.
The coefficient in 3H2O is
a)
6
b)
5
c)
2
d)
3
6.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
7.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
8.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
9.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
10.
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
11.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
12.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
13.
How many Mn atoms are found in the following compound?
3Cr(MnO4)6
3Cr(MnO4)6
a)
3
b)
4
c)
6
d)
18
14.
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
15.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
16.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
17.
What is the number before a chemical formula called?
Ex: 2H2 + O2 --> 2H2O
Ex: 2H2 + O2 --> 2H2O
a)
Coefficient
b)
Subscript
c)
Atom
d)
Equation
18.
How many aluminum atoms are in Al2(SO4)3?
a)
1
b)
2
c)
3
d)
4
19.
How many atoms are in the neurotransmitter serotonin? The formula for serotonin is C10H12N2O
a)
10
b)
20
c)
25
d)
23
20.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
21.
Is the following equation balanced?
4Fe + 3O2 --> 2Fe2O3
4Fe + 3O2 --> 2Fe2O3
a)
yes
b)
no
22.
Is the following reaction balanced?
NaHCO3 --> Na2CO3 + H2O + CO2
NaHCO3 --> Na2CO3 + H2O + CO2
a)
yes
b)
no
23.
Is the following reaction balanced?
2CH3OH + 3O2 --> 2CO2 + 4H2O
2CH3OH + 3O2 --> 2CO2 + 4H2O
a)
yes
b)
no
24.
Which of the following equations are correctly balanced?
a)
12CO2 +H2O --> C6H12O6 + O2
b)
CO2 + 9H2O --> C6H12O6 + O2
c)
CO2 + H2O --> 3C6H12O6 + O2
d)
6CO2 + 6H2O --> C6H12O6 + 6O2
25.
How many Oxygens are in this molecule?
(OH)2
(OH)2
a)
4
b)
1
c)
2
d)
3
26.
What are the smaller numbers that you CANNOT change in a chemical equation?
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscript
27.
What are the larger numbers that you CAN CHANGE in a chemical equation?
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscripts
28.
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
29.
Balance this chemical reaction......?
__H2O2 ----> __H2O + O2
__H2O2 ----> __H2O + O2
a)
2H2O2 // 2H2O
b)
1H2O2 // 2H2O
c)
2H2O2 // 1H2O
d)
H2O2 // 2H2O
30.
Why is it called the Law of Conservation of Matter/Mass?
a)
Energy is created and destroyed
b)
Energy is never created, nor destroyed-- it always moves
c)
Energy moves between particles
d)
Energy stops moving at the end of the universe
31.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__Na + __H2O --> __NaOH + __H2
a)
2,2 --> 2,1
b)
4,4 --> 4,1
c)
1,2 --> 2,4
d)
1,2 --> 2,1
32.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?
__Ca + __H2O --> __Ca(OH)2 + __H2
a)
2,1 --> 2,1
b)
1,2 --> 1,1
c)
1,2 --> 2,4
d)
1,2 --> 2,1
33.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CO + __Fe2O3--> __Fe + __CO2
a)
3,1 --> 2,3
b)
3,2 --> 1,1
c)
3,2 --> 2,4
d)
3,2 --> 2,1
34.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CH4 + __O2 --> __CO2+ __H2O
a)
2,1 --> 2,1
b)
1,2 --> 1,1
c)
1,2 --> 1,2
d)
1,2 --> 2,1
35.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__AgNO3 + __H2S --> __Ag2S+ __HNO3
a)
2,1 --> 1,2
b)
1,2 --> 1,1
c)
1,2 --> 1,2
d)
1,2 --> 2,1
36.
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
37.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__H2SO3 + __KOH--> __H2O+ __K2SO3
a)
2,1 --> 2,1
b)
1,2 --> 1,1
c)
1,2 --> 1,2
d)
1,2 --> 2,1
38.
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
39.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__MnO2 + __HCl --> __MnCl2 + __H2O __Cl2
a)
4,1 --> 2,1,2
b)
1,2 --> 1,1,4
c)
1,4 --> 1,2,1
d)
1,4 --> 2,2,1
40.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__FeCl3 + __Ca(OH)2 --> __Fe(OH)3 + __CaCl2
a)
4,3--> 2,1
b)
3,2 --> 3,1
c)
2,3 --> 2,2
d)
2,3 --> 2,3
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