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Chemistry Final Exam 2021

Total questions: 70

Worksheet time: 3hrs 6mins

Name
Class
Date
1.

The name of FeCl₂ is

a)

iron chloride

b)

iron (II) chloride

c)

iron (I) chloride

d)

iron dichloride

2.

LiBr is called

a)

lithium bromine

b)

lithium (I) bromine

c)

lithium bromide

d)

lithuim (I) bromide

3.

What is the name of the compound Na2(SO4)?

a)

Sodium sulfate

b)

Sodium sulfide

c)

Sodium sulfite

d)

Sodium sulfuroxide

4.

Which of these combinations is an ionic compound made of?

a)

Metal and Metal

b)

Nonmetal and Nonmetal

c)

Metal and Nonmetal

d)

Cation and Cation

5.
What is the name of N2O3
a)
Nitrogen trioxide
b)
Dinitrogen oxide
c)
Dinitrogen trioxide
d)
Nitrogen oxide
6.
What is the chemical formula for Tetrasulfur pentoxide?
a)
SO
b)
S4O
c)
S4O5
d)
S5O4
7.
The chemical formula of sulfur hexabromide is
a)
SBr₆
b)
S₆Br
c)
S(VI)Br
d)
S6Br
8.

When electrons are transfered from cations to anions a(an) ________ bond is formed

a)

polar covalent

b)

nonpolar covalent

c)

ionic

d)

metallic

9.

When electrons are shared a(an) ________ bond is formed

a)

ionic

b)

covalent

c)

metallic

10.

A(an) __________ bond exists between two nonmetals.

a)

ionic

b)

covalent

11.
What is a positivly charge atom called?
a)
cation
b)
anion
12.

What is a negatively charged atom called?

a)

Anion

b)

Cation

c)

Ion

13.

What is a valence electron?

a)

an electron that is found in the outermost shell of an atom.

b)

an electron found in the innermost shell of an atom.

c)

an electron found in the middle shell.

14.

What type of reaction involves the breaking down of a substance into simpler substances?

a)

Single Displacement Reaction

b)

Double Displacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

15.

What type of reaction involves 2 substances combining to form 1 new compound?

a)

Decomposition Reaction

b)

Single Displacement Reaction

c)

Double Displacement Reaction

d)

Synthesis Reaction

16.

What type of reaction involves one element replacing another element in a compound?

a)

Single Displacement Reaction

b)

Double Displacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

17.

What type of reaction involves ions from 2 compounds exchanging places to form 2 completely new compounds?

a)

Single Displacement Reaction

b)

Double Displacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

18.

What are the reactants in the chemical equation pictured?

a)

CH4 and CO2

b)

CH4 and O2

c)

CO2 and H2O

d)

O2 and H2O

19.

What are the products of the chemical reaction pictured?

a)

CH4 and CO2

b)

CH4 and O2

c)

CO2 and H2O

d)

O2 and H2O

20.

What type of chemical reaction is this one?

Al(OH)3 --> Al2O3 + H2O

a)

Decomposition

b)

Combustion

c)

Synthesis

d)

Single Replacement

21.

What type of chemical reaction is this one?

CUO + CO2 --> CuCO3

a)

Decomposition

b)

Combustion

c)

Synthesis

d)

Single Replacement

22.

What type of chemical reaction is this one?

Ca + MgCl2 --> CaCl2 + Mg

a)

Decomposition

b)

Combustion

c)

Synthesis

d)

Single Replacement

23.

What type of reaction is illustrated below?

2HI --> H2 + I2

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

24.

What type of reaction is illustrated below?

Zn + H2S --> ZnS + H2

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

25.

What type of chemical reaction is this one?

C2H2 + O2 --> CO2 + H2O

a)

Decomposition

b)

Combustion

c)

Synthesis

d)

Single Replacement

26.

3KOH + H3PO4 --> K3PO4 + 3H2O

a)

Combination

b)

Decomposition

c)

Single replacement

d)

Double replacement

27.

2Na +S → Na2S

a)

Double Replacement

b)

Decomposition

c)

Combustion

d)

Synthesis

28.
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.
29.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
30.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
31.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
32.
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
33.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
34.
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. 
35.
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
36.
Balance this equation-
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
37.
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
38.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
39.

Fill in the blanks with coefficient:

PCl5+_ H2O→_ HCl+H3PO4

a)

4, 5

b)

1, 6

c)

3, 8

d)

2,2

40.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
6
c)
8
d)
24
41.
What are the smaller numbers that you CANNOT change in a chemical equation? 
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscript
42.
Balance the equation:
Si(OH)4+NaBr--> SiBr4+NaOH
a)
Si(OH)4+2NaBr--> SiBr4+NaOH
b)
Si(OH)4+4NaBr--> SiBr4+4NaOH
c)
Si(OH)4+NaBr--> SiBr4+4NaOH
d)
Si(OH)4+2NaBr--> SiBr4+2NaOH
43.

Which of the following correctly balances this equation:

Sodium phosphate and potassium hydroxide will produce sodium hydroxide and potassium phosphate.

a)

1 Na3PO4+3 KOH

--->

3 NaOH + 1 K3PO4

b)

2 Na3PO4+2 KOH

--->

3 NaOH + 1 K3PO4

c)

1 S3PO4+3 SOH

--->

3 SOH + 1 K3PO4

d)

3 Na3P+3 KO2H

--->

3 NaH2O + 1 K3P

44.
What is the molar mass of table salt (NaCl)?
a)
116.886 g/mol
b)
35.453 g/mol
c)
22.990 g/mol
d)
58.443 g/mol
45.
What is the molar mass of CO2?
a)
12
b)
16
c)
32
d)
44
46.

Calculate the molar mass of Ba(C2H3O2)2

a)

255.3 g/mol

b)

237.3 g/mol

c)

228.3 g/mol

d)

196.3 g/mol

47.

Calculate the molar mass for Al(OH)3

a)

78.0 g/mol

b)

72 g/mol

c)

28 g/mol

d)

25 g/mol

48.

Calculate the molar mass of NH4NO2

a)

50 g/mol

b)

60 g/mol

c)

64 g/mol

d)

78 g/mol

49.

Calculate the molar mass of water (H2O).

a)

10 g/mol

b)

17 g/mol

c)

18 g/mol

d)

34 g/mol

50.

Calculate the molar mass of Cu2O.

a)

37 g/mol

b)

45 g/mol

c)

79.5 g/mol

d)

143 g/mol

51.
The number 6.02 x 1023, which is the number of particles found in a mole. 
a)
molar mass
b)
mole
c)
Avogadro's number
d)
hydrate
52.
How many molecules are in 9.44 moles of AlCl3?
a)
5.68 molec AlCl3
b)
5.68x1024 molec AlCl3
c)
0.705 molec AlCl3
d)
1.25x1023 molec AlCl3
53.
How many molecules of sugar (C6H12O6) are in a mole?
a)
24 molecules
b)
180 molecules
c)
180 g
d)
6.02 x 1023 molecules
54.

How many molecules are in 2.5 mol of NaCl?

a)

1.51x1023

b)

146

c)

4.15

d)

1.51x1024

55.
How many moles are 2.85 x 1018 atoms of iron?
a)
4.73 x 10-6 moles
b)
1.72 x 1042 moles
c)
1.72 x 10-42 moles
d)
4.73 x 106 moles
56.

Determine the number of moles of AlNO3 that are in 264 g of the compound.

a)

2.97 mol

b)

3.45 mol

c)

2.73 mol

d)

1.86 mol

57.

Determine the amount of moles in CuBr that are in 276.9 g of the compound.

a)

3.2 mol

b)

1.7 mol

c)

2.1 mol

d)

1.9 mol

58.

Determine the amount of moles of BaCl2 that are in 436 g of the compound.

a)

3.5 mol

b)

2.1 mol

c)

4.6 mol

d)

2.7 mol

59.

Determine the number of moles of Mg3P2 that are in 583 g of the compound.

a)

2.9 mol

b)

6.1 mol

c)

4.3 mol

d)

1.7 mol

60.

A baker needs 6 g of baking soda for a recipe. The chemical formula for baking soda is NaHCO3. How many moles of baking soda is needed?

a)

0.071 mol

b)

0.167 mol

c)

0.273 mol

d)

0.214 mol

61.

Converting from gram A to gram B, the first step is to

a)

Convert from mole A to mole B

b)

Convert from mole B to gram B

c)

Convert from gram A to mole A

62.
For the Balanced Reaction:
3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe;
What is the Ratio of moles of Mg to moles Fe?
a)
3mol Mg / 2 mol Fe
b)
2 mol Mg/ 3 mol Fe
c)
1 mol Fe/ 2 mol Fe
d)
3 mol MgO / 2 mol Fe
63.

Select the correct molar ratio taken from this balanced equation:


4 Al + 3 O2 --> 2 Al2O3

a)

1 mol Al = 1 mol Al2O3

b)

4 Al = 2 Al2O3

c)

4 mol Al = 2 mol Al2O3

d)

4 mol Al = 2 mol Al

64.

1 N­2 + 3 H2 --> 2 NH3


How many moles of NH3 will be produced from 10.2 x 10^25 molecules of H2?


(6.02 x 10^23 molecules H2= 1 mol H2)

a)

113 mol NH3

b)

254 mol NH3

c)

169 mol NH3

d)

508 mol NH3

65.

Bornite, Cu3FeS3, is a copper ore used in the production of copper. When heated, the following reaction occurs:

2 Cu3FeS3(s) + 7 O2(g) --> 6 Cu(s) + 2 FeO(s) + 6 SO2(g)

If 450 moles of bornite are reacted, determine the number of moles of copper produced.

a)

750 mol bornite

b)

1350 mol bornite

c)

1525 mol bornite

d)

150 mol bornite

66.
2Na + 2H2O → 2NaOH+ H2
How many grams of hydrogen are produced if 120 g of Na are available?
a)
5.2 g
b)
2.6 g
c)
690 g
d)
45 g
67.
B2H6 + 3O2 -->2 HBO2 + 2 H2O
 What mass of O2 will be needed to burn 36.1 g of B2H6?
a)
13.8 g O2
b)
3.86 mol of O2
c)
124 g O2
68.
2H2   +   O2  →  2H2O
How many moles of water can be produced if 8 moles H2 are used?
a)
4 moles
b)
8 moles
c)
16 moles
d)
2 moles
69.
2H2  +   O2  →  2H2O
How many moles of oxygen are consumed if 8 moles H2 are used?
a)
2
b)
4
c)
6
d)
8
70.
The Formula to make S'mores is:
2C + 1M + G2 → C2MG2. If you have 5 Marshmallows (M), 9 Chocolate Pieces (C), and 9 Graham Cracker Halves (G), how many S'mores can you make?
a)
5
b)
4
c)
8
d)
42

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