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Chemistry Test #4 Review

Total questions: 65

Worksheet time: 1hrs 5mins

Name
Class
Date
1.
In chemistry, a "mole" is:
a)
The mass of an atom
b)
a large number used to count particles
c)
based on the volume of a substance
2.
How many atoms of iodine are in a mole of iodine?
a)
53
b)
63.55g
c)
126.9
d)
6.02 x 1023
3.
The number 6.02 x 1023 is called...
a)
Obama's number
b)
Bohr's number
c)
Trump's number
d)
Avogadro's number
4.
What is the molar mass of NaCl?
a)
58.45g/mol
b)
28g/mol
c)
12g/mol
d)
6.02 x 1023
5.
What is the molar mass of C2H4O2?
a)
40g
b)
50g
c)
60g
d)
68g
6.
What would be the mass of 1.5mol H2O
a)
20
b)
27
c)
32
d)
40
7.
What is the mass of 0.75 moles of (NH4)3PO4?
a)
101.75 g
b)
121.75 g
c)
111.75 g
d)
131.75 g
8.
If I need 20.4 moles of sodium chloride, how much should I weigh out?
a)
0.549 g
b)
112 g
c)
1192 g
d)
5077 g
9.
How many particles would be in 8.4 moles of Octane (C8H18)?
a)
5.77 x 1023
b)
5.04 x 1024
c)
5.77 x 1026
d)
5.04 x 1023
10.
What is the percent by mass of oxygen in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
11.
What is the percent by mass of magnesium in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
12.

Which element in the compound potassium cyanide, KCN, has a percent composition of 60.97%?

a)

K

b)

C

c)

N

d)

None of the above

13.
What is the percent composition of Benzene, C6H6?
a)
C = 50%
H = 50%
b)
C = 85.7 %
H = 14.3%
c)
C = 92.2%
H = 7.8%
d)
C = 71.9%
H = 28.1%
14.
Na2CO3 · 10H2O is known as sodium sulfate ______
a)
Hydroxide
b)
Hydrate
c)
Decahydrate
d)
None of the above
15.
Name the following hydrate:  NaCl * 5H2O
a)
sodium chloride 
b)
sodium monochloride pentahydrate
c)
sodium chloride pentahydrate
d)
pentahydrate
16.

A compound that attracts and holds water in the structure forming a crystalline substance is called a(n)

a)

anhydrous material

b)

hydrate

c)

electrolyte

d)

alloy

17.

In the performance of the copper II sulfate hydrate lab a visual indicator that water was still present was

a)

the substance was blue

b)

the substance turned white

c)

the substance fizzed

d)

the substance changed temperature

18.

A 19.84 g sample of CaSO4*2H2O was heated to drive off the water. The mass was reduced to 4.18 g. What percent of this compound is the anhydrous salt?

a)

78.94%

b)

21.06%

c)

33.33%

d)

50.00%

19.

A 15.67 g sample of a MgSO3*5H2O was heated to drive off the water. The mass was reduced to 7.58 g. What percent of this compound is water?

a)

51.63%

b)

50.00%

c)

48.37%

d)

83.33%

20.
What is the percent by mass of oxygen in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
21.
What is the percent by mass of sodium in NaCl?
a)
39%
b)
61%
c)
35%
d)
65%
22.
What is the percent by mass of fluorine in CaF2 (gram-formula mass = 78 g/mol)?
a)
24%
b)
49%
c)
51%
d)
65%
23.
What is the percent composition by mass of sulfur in the compound MgSO4 (gram formula mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
24.

What is the percent composition by mass of sulfur (S) in the compound MgSO4?

a)

20.22%

b)

19.85%

c)

26.64%

d)

28.64%

25.
What is the percent composition of water?
a)
H = 11.1%
O = 89.9%
b)
H = 66.7%
O = 33.3%
c)
H = 5.6%
O = 89.9%
d)
H = 20%
O = 80%
26.
What is the percent composition of aluminum phosphate?
a)
Al = 25%
P = 25%
O = 75%
b)
Al = 22.1%
P = 35.8%
O = 42.1%
c)
Al = 14.3%
P = 25.4%
O = 60.3%
d)
Al = 22.1%
P = 25.4%
O = 52.5%
27.
What is the % water in a hydrate with the following data:
Mass of Crucible & Hydrate = 34.66 g 
Mass of Crucible = 28.45 g
Mass Crucible & Anhydrate = 32.98 g
a)
72.9 %
b)
27.1 %
c)
65.2%
d)
34.8 %
28.

What is the percent of nitrogen in (NH4)2S?

a)

25.9%

b)

29.7%

c)

41.1%

d)

45.8%

29.

What is the percent of hydrogen in (NH4)2S?

a)

14.8%

b)

11.7%

c)

2.1%

d)

1.6%

30.

What percent of Zn3(PO4)2 is zinc?

a)

33.15%

b)

16.04%

c)

50.80%

d)

19.68%

31.
Which of the following is NOT needed to calculate percent composition?
a)
Mass of specific element
b)
Molar Mass
c)
Avogadro's Number
d)
Division
32.
What are the units in molar mass?
a)
grams
b)
moles
c)
moles/gram
d)
grams/mole
33.

In the lab, a chemist analyzed a sample of methanol and found that it was made of 5.8 grams of carbon, 4.0 grams of hydrogen, and 15.2 grams of oxygen. What is the percent composition of each element?

a)

37% C 18% H 45% O

b)

23% C 16% H 60% O

c)

27% C 12% H 61% O

d)

18% C 12% H 70% O

34.

What is the percent composition by mass for each element in Acetaminophen C8H9NO2?

a)

62% C 6% H 10% N 22% O

b)

62% C 8% H 10% N 20% O

c)

64% C 6% H 9% N 21% O

d)

64% C 8% H 12% N 16% O

35.

What answer choice best represents the percentage composition of beryllium in the compound beryllium cyanide?

a)

14.76%

b)

39.34%

c)

45.88%

d)

63.36%

e)

52.27%

36.

What answer choice best represents the percentage composition of sodium in the compound sodium acetate?

a)

28.02%

b)

29.28%

c)

3.69%

d)

39.01%

e)

55.23%

37.

What answer choice best represents the percentage composition of carbon in the compound sodium acetate?

a)

28.02%

b)

29.28%

c)

3.69%

d)

39.01%

e)

55.23%

38.

What answer choice best represents the percentage composition of lithium in the compound lithium nitrate?

a)

10.07%

b)

20.32%

c)

69.62%

d)

72.23%

e)

35.65%

39.

What answer choice best represents the percentage composition of nitrogen in the compound lithium nitrate?

a)

10.07%

b)

20.32%

c)

69.62%

d)

72.23%

e)

35.65%

40.
Name the following ionic compound: MgSO4*7H2O
a)
magnesium sulfate * hexahydarte
b)
magnesium sulfate hexahydarte
c)
magnesium sulfate heptahydrate
d)
magnesium sulfate* heptahydrate
41.
Na2CO3 · 10H2O is known as sodium sulfate ______
a)
Hydroxide
b)
Hydrate
c)
Decahydrate
d)
None of the above
42.
Name the following hydrate:  NaCl * 5H2O
a)
sodium chloride 
b)
sodium monochloride pentahydrate
c)
sodium chloride pentahydrate
d)
pentahydrate
43.

Determine the formula of CuSO4·?H2O hydrate given the following data:

Test Tube = 23.56 g

Test Tube + Hydrate = 26.06 g

Test Tube + Anhydrate = 25.16 g

a)

CuSO4·H2O

b)

CuSO4·2H2O

c)

CuSO4·4H2O

d)

CuSO4·5H2O

44.

State the correct name for the following compound: Cr(NO3)3 ⋅ 9H2O

a)

chromium nitrate nonahydrate

b)

chromium (III) nitrate nonahydrate

c)

chromium nitrogen trioxide nonahydrate

d)

chromium (I) nitrate heptahydrate

45.

What is the correct chemical formula for barium hydroxide octahydrate?

a)

Ba(OH)2 . 8H2O

b)

Ba(OH)2 . H2O

c)

8Ba(OH)2 . H2O

d)

Ba . 8(OH)2

46.
A compound is a hydrate when it...
a)
is composed of only hydrogen and oxygen
b)
is a state of water
c)
traps water inside of the compound
d)
repels water from the compound
47.

What is the best method for removing water from a hydrated compound?

a)

freezing

b)

filtration

c)

distillation

d)

heating

48.

Dried or without water

a)

anhydrate/anhydride

b)

hydrate

c)

grapes

49.

What is the formula for tin (IV) chloride pentahydrate?

a)

SnCl2•5H2O

b)

TnCl4•5H2O

c)

SnCl4•6H2O

d)

SnCl4•5H2O

50.

What is the correct molecular formula for the compound, tin(II) chloride dihydrate?

a)

SnCl4•2H2O

b)

SnCl2•2H2O

c)

SnCl2•4H2O

d)

TnCl2•2H2O

51.

What is the correct name for the compound, CrBr3•6H2O?

a)

krypton bromide hexahydrate

b)

chromium(II) bromide hexahydrate

c)

chromium(III) bromide hexahydrate

d)

chromous bromide hexahydrate

52.

What is the formula for manganese (II) bromide tetrahydrate?

a)

MnBr2•4H2O

b)

MgBr2•4H2O

c)

MnBr4•4H2O

d)

MnBr2•3H2O

53.

What is the correct name for the compound, Ba(OH)2•8H2O?

a)

barium dihydroxide octahydrate

b)

barium hydroxide octahydrate

c)

barium hydroxide hydrate

d)

boron hydroxide octahydrate

54.

How many hydrogen atoms are there in the compound FeCl2•4H2O?

a)

4

b)

2

c)

6

d)

8

55.

85.0 g of sodium hydroxide is equal to how many moles?

a)

3400 moles

b)

45 moles

c)

0.47 moles

d)

2.1 moles

56.

2.0 moles of gold (III) chloride is equal to how many grams?

a)

152 g

b)

607 g

c)

464 g

d)

0.007 g

57.

How many moles are present in a 32.5 sample of aluminum chloride?

a)

720 moles

b)

1.2 moles

c)

0.24 moles

d)

4.1 moles

58.

 How many grams are in 0.2 moles of beryllium iodide?

a)

52.6 g

b)

1315 g

c)

27.2 g

d)

0.002 g

59.
How many moles of methane gas molecules, CH4, are in 11.2 liters of methane at standard conditions?
a)
11.2 moles 
b)
.5 moles
c)
179.2 moles
d)
27.2 moles
60.
How many moles of O2 are their in 89.6 liters?
a)
2 moles
b)
16 moles
c)
4 moles
d)
1 mole
61.
A container with a volume of 893 L contains how many moles of air at STP?
a)
20003.2 L
b)
39.9 mole
c)
22.4 L
d)
none of the choices
62.

How many grams are in 5.0 x 1024 particles of LiBr?

a)

720.69 particles

b)

720.69 g

c)

.0957 g

d)

.0957 particles

63.

If you have 22 grams of H2O2, how many molecules would that be?

a)

3.089 x 1023 molecules

b)

1.035 x 1023 molecules

c)

7.36 x 1023 molecules

d)

4.139 x 1023 molecules

64.

How many grams are in 1.2 x 1024 molecules of CO?

a)

28 grams

b)

56 grams

c)

6.02 grams

d)

1.2 grams

65.

How many grams are in 1.35 x 1024 atoms of KCN?

a)

.03 grams

b)

145.7 grams

c)

125 grams

d)

1.2 grams

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