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CA #5 Test Review

Total questions: 33

Worksheet time: 8hrs 15mins

Name
Class
Date
1.

What products are always formed in a combustion reaction? (check all that apply)

a)

H2O

b)

CO2

c)

CH4

d)

O2

2.

Balance the following reaction:

___Pb(OH)2 (s) → ___PbO (s) + ___H2O (g)

a)

1:1:1

b)

2:1:2

c)

1:1:2

d)

2:2:1

3.

Balance the following reaction:

___KClO3 (s) → ___KCl (s) + ___O2 (g)

a)

1:1:1

b)

2:1:2

c)

2:3:2

d)

2:2:3

4.

Balance the following reaction:

___Cu + ___O2 → ___CuO

a)

1:1:1

b)

2:2:1

c)

2:1:2

d)

2:2:2

5.

Fe2O3 has a molar mass of 159.70 g/mol. What is the percent composition of Oxygen in this compound?

a)

69.94%

b)

30.06%

c)

50%

d)

60%

6.

What is the percent composition of each element in NaCl?

a)

50% Na, 50% Cl

b)

39% Na, 61% Cl

c)

61% Na, 39% Cl

d)

35% Na, 65% Cl

7.

Balance the following equation:

___Al + ___N2 → ___AlN

a)

1:1:1

b)

1:1:2

c)

2:1:1

d)

2:1:2

8.

Identify the type of reaction:

Al(NO3)3 + H2SO4 → Al2(SO4)3 + HNO3

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

9.

Identify the type of reaction:

N2 + O2 → N2O

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

10.

Identify the type of reaction:

2NaOH→Na2O+H2O

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

11.

Identify the type of reaction:

C3H6O + O2 → CO2 + H2O

a)

Synthesis

b)

Decomposition

c)

Combustion

d)

Single replacement

12.

Identify the type of reaction:

Fe + Cu(NO3)2 → Cu + Fe(NO3)2

a)

Synthesis

b)

Decomposition

c)

Combustion

d)

Single Replacement

13.

What is the percent composition of potassium (K) in KCO2?

a)

50.00%

b)

47.05%

c)

38.50%

d)

14.45%

14.

True or False: Chemical equations are balanced to follow the law of conservation of mass

a)

True

b)

False

15.

Which type of reaction is:

C7H16 + 10 O2 → 7 CO2 + 8 H2O

a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Combustion
16.

When balancing a chemical equation, you can only change _________, you can never change _______!

a)

coefficients, subscripts

b)

subscripts, coefficients

c)

formulas, subscripts

d)

coefficients, formula units

17.

Identify the type of reaction:

Si + S8 --> Si2S4

a)
Synthesis (combination)
b)
Decomposition
c)

Single Displacement

d)

Double Displacement

18.

Identify the type of reaction:

Fe + H2SO4 --> Fe2(SO4)3 + H2

a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
19.
Which of the following is the general formula for a decomposition reaction?
a)
A + B  → AB
b)
AB → A + B
c)
AB + C → AC + B
d)
AB + CD → AC + BD
20.

Which type of reaction is represented by the following chemical equation?

HCl + NaOH →\rightarrow   H2O + NaCl

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

21.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)

1, 1, 1, 1

c)
4, 12, 3, 4
d)
2, 1, 4, 5
22.
Balance this equation-
__P4 + __O2 --> __P2O3
a)

1, 1, 1

b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
23.
Find the percent composition of Cu2S?
a)

Cu= 67.99% S= 32.01%

b)

Cu= 79.85% S= 20.15%

c)

Cu= 35.95%   S= 64.05%

d)

Cu= 20.15% S=79.85%

24.

Find the percentage composition of Mg in Mg3(PO4)2.


a)

27.74% Mg

b)

43.11% Mg

c)

16.00% Mg

d)

12.63% Mg

25.

Find the percent composition of CaCl2?

a)

Ca: 36.11%; Cl: 63.88%

b)

Ca: 53.12%; Cl: 100%

c)

Ca: 36.11%; Cl: 83.56%

d)

Ca: 46.11%; Cl: 63.88%

26.
A formula with the lowest whole # ratio of elements in a compound is called
a)
Molecular Formula
b)
Chemical Formula
c)
Empirical Formula 
d)
Distance Formula
27.

What is the empirical formula for C4H6?

a)

CH

b)

CH3

c)

C2H3

d)

C4H6

28.

What is the empirical formula for N2S3?

a)

NS

b)

N3S2

c)

N2S3

d)

N1S1.5

29.
A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________
a)
ionic formula
b)
covalent formula
c)
empirical formula
d)
molecular formula
30.
What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?
a)
CH2O
b)
C2H4O2
c)
C4H8O4
d)
C6H12O6
31.
What is the molecular formula for a compound with the empirical formula: K2SO4 and a molecular mass of 696g.
a)
K2SO4 
b)

K4S2O8

c)

K6S3O6 

d)
K8S4O16 
32.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
33.

Balance the following reaction:

___C3H8O (g) + ___O2 (g) → ___CO2 (g) + ___H2O (g)

a)

2:9:6:8

b)

2:9:3:4

c)

1:3:3:4

d)

1:3:5:4

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