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Worksheets

FEB Review

Total questions: 35

Worksheet time: 38mins

Name
Class
Date
1.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
2.
Balance this equation
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
3.
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. 
4.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
5.
What is the arrow in a chemical equation...
H2 + O --> H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
6.
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.
7.
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
8.
Which side of a chemical equation is the product side?
a)
Left (before the arrow)
b)
Right (after the arrow)
9.
Which side of a chemical equation is the reactant side?
a)
Left (before the arrow)
b)
Right (after the arrow)
10.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
11.
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
12.
KNO3 --> KNO2 + O2
What coefficients are needed to balance the reaction?
a)

2, 2, 1

b)

2, 3, 2

c)

1, 2, 2

d)

1, 3, 1

13.
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
14.

What type of reaction is this?

2 La (s)  +  3 Br2 (g)  →  2 LaBr3 (s)

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

15.

What type of reaction is this?

HBr (aq)  +  NaOH (aq)  →  NaBr (aq)  +  H2O (l)

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

16.

What type of reaction is this?

NH4NO3 (s)  →  N2O (g)  +  2 H2O (l)

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

17.

What type of reaction is this?

3 FeCl2 (s)  +  2 O2 (g)  →  Fe3O4 (s)  +  3 Cl2 (g)

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

18.

What type of reaction is this?

3 Cd (s)  +  2 Al(NO3)3 (aq)  →  3 Cd(NO3)2 (aq)  +  2 Al (s)

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

19.

What type of reaction is this?

3 Ba(OH)2 (aq)  +  Fe2(SO4)3 (aq)  →  3 BaSO4 (s)  +  2 Fe(OH)3 (s)

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

20.

What type of reaction is this?

SiO2 (s)  +  4 HF (aq)  →  SiF4 (s)  +  2 H2O (l)

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

21.

What type of reaction is this?

C3H8 (l) +5 O2(g)→ 4 H2O (g) + 3 CO2 (g)C_3H_{8\ \left(l\right)}\ +5\ O_{2\left(g\right)}\rightarrow\ 4\ H_2O\ _{\left(g\right)}\ +\ 3\ CO_{2\ \left(g\right)}  

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

22.

What type of reaction is this?

HC2H3O2 (aq)  +  LiOH (aq)  →  LiC2H3O2 (aq)  +  H2O (l) 

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

23.

What type of reaction is this?

H2 (g)  +  Br2 (g)  →  2 HBr (g)

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

24.

A _ reaction is where 2 or more elements combine into a single product.

(a)  

25.

A _reaction is when one element in a compound gets replaced by another element.

(a)  

26.

A _reaction is when two elements swap or switch elements that they are combined with.

(a)  

27.

Calculate the number of Oxygen atoms in Al(OH)3

a)

1

b)

2

c)

3

d)

4

28.

4CF2Cl2

a)

C = 4, F = 4, Cl = 2

b)

C = 1, F = 8, Cl = 8

c)

C = 4, F = 8, Cl = 8

d)

C = 1, F = 4, Cl = 8

29.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
30.

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

31.
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

32.
Balance this equation:
P4+O2  -->  P2O3
a)

3 P4+ O2 --> 2 P2O3

b)

 P4+ O2 --> 2 P2O3

c)

 P4+ 3 O2 --> 2 P2O3

d)

 P4+ 2 O2 --> 3 P2O3

33.
Balance this equation,            
Al2O3 --> Al + O2 
a)

Cannot be balanced

b)

2Al2O3 --> 2Al+3O2 

c)

2Al2O3--> 4Al+3O2 

d)

3Al2O3--> 2Al+O2 

34.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
35.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24

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