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Balancing and classifying chemical equations

Total questions: 40

Worksheet time: 39mins

Name
Class
Date
1.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
2.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
3.
Si + S8 --> Si2S4
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
4.
Ca + AlCl3 --> CaCl2 + Al
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
5.
C3H8 + O2 --> H2O + CO2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
6.
Mg + N2 --> Mg3N2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
7.
What will weigh more when a chemical change is complete?  The reactants before the chemical reaction, or the product after the reaction is complete?
a)
They both will weigh the same
b)
The product always weighs more than the reactant
c)
The reactant will weigh more than the product
d)
They both will loose mass after the reaction
8.
The coefficient in  3H2O is
a)
6
b)
2
c)
3
d)
5
9.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
10.
A chemical reaction is balanced when
a)
both sides have the same elements
b)
Both sides have the same  number of atoms
c)
Same subscripts
d)
Same coefficients
11.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
12.
In the following equation, what are the products?
HCl + Zn → H2 + ZnCl2
a)
HCl + Zn
b)
H2 + ZnCl2
c)
Zn → H2
d)
the stuff on the outside
13.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products.
d)
Matter is not changed.
14.
How many Oxygen (O) atoms are in 2C2HO8Cl2
a)
2
b)
16
c)
8
d)
5
15.
 Fill in the blank to balance the chemical equation. 
2KI  +  ____Cl2 →  2KCl  +  I2
a)
1
b)
2
c)
3
d)
4
16.
What coefficient should go in the blank space to balance the chemical equation? 
2Al  +____  HCl   →    2AlCl3  +  3H2
a)
2
b)
4
c)
3
d)
6
17.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
18.
Which of the following shows the correct way to balance the chemical equation?
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.
19.
Balance this equation...
HgO --> Hg + O2
a)
It is balanced 
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
d)
I don't know...Oh well!
20.
Which coefficients balance this equation:
NH3  +  O2 ---->   NO  + H2O
a)
2,3,5,6
b)
5,5,4,6
c)
4,6,4,5
d)
4,5,4,6
21.
Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O
a)
1,2,1,1
b)
2,1,2,1
c)
1,2,1,2
d)
0,2,0,2
22.
Balance this equation.
_SnO2 +_H2-->_Sn +_H2O
a)
1,1,2,1
b)
1,2,1,1
c)
1,2,1,2
d)
1,2,2,1
23.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
24.

The reaction XY --> X + Y is an example of _____.

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

25.

The reaction A + B --> AB is classified as a _____ reaction.

a)

synthesis

b)

decomposition

c)

single replacment

d)

double replacement

26.

The reaction AB + X --> XB + A is classified as a _____ reaction.

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

27.

The reaction AB + XY --> XB + AY is an example of ______.

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

28.

What class of reaction best describes the equation below: 2HI --> H2 + I2

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

29.

What class of reaction best describes the equation below: Zn + H2S --> ZnS + H2

a)

synthesis

b)

combustion

c)

single replacement

d)

double replacement

30.

What class of reaction best describes the equation below: CH4 + O2 --> CO2 + H2O

a)

single replacement

b)

double replacement

c)

decomposition

d)

combustion

31.

What class of reaction best describes the equation below: FeS + HCl --> H2S + FeCl2

a)

synthesis

b)

combustion

c)

single replacement

d)

double replacement

32.
Mg + HCl --> MgCl2 + H2
a)
combustion
b)
synthesis
c)
decomposition
d)
single replacement
33.

Which of the following is an example of a single replacement reaction?

a)

2NaF --> 2 Na + F2

b)

P2O5 + 3 H2O --> 2H3PO4

c)

2FeCl3 + 3Zn --> 2Fe + 3ZnCl2

d)

C6H12O6 + 6O2 --> 6CO2 + 6 H2O

34.

Which of the following is an example of a synthesis reaction?

a)

Cl2 + 2NaBr --> 2NaCl + Br2

b)

MgO + CO2 --> MgCO3

c)

FeBr3 + K3PO4 --> FePO4 + 3KBr

d)

2Na2O2 --> 2Na2O + O2

35.
How many oxygen atoms are present in the following? 
4Ca(OH)2
a)
4
b)
6
c)
8
d)
1
36.
What is changed in a chemical reaction like this one? 
NaOH + HCl   →  NaCl + H2O
a)
the number of atoms is changed
b)
molecules and compounds are changed 
c)
atoms are changed
d)
elements are changed 
37.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
38.
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
39.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
40.
Name the part in red:

_2_H2 + _1_O2 -> _2_H2O
a)
Coefficient
b)
Product
c)
Yield
d)
Subscript

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