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U6 CUA Retake assignment

Total questions: 148

Worksheet time: 7hrs 28mins

Name
Class
Date
1.
Avogadro's number of representative particles is equal to one_____.
a)
kilogram
b)
gram
c)
kelvin
d)
mole
2.
What is Avogadro's Number? 
a)
6.02 x 1023
b)
- 6.02 1023
c)
6.02 x 1022
d)
6,020,000,000,000
3.
The molar mass of an element is the mass of one ____ of the element.
a)
atom
b)
molecule
c)
mole
d)
gram
4.
A mole of Neon contains
6.02 x 1023 _____.
a)
atoms
b)
formula units
c)
ions
d)
molecules
5.

How many moles of carbon are there in a pure diamond with mass 6g?

a)

0.5mol

b)

1.0mol

c)

2.0mol

d)

4.0mol

6.
What is the molar mass of NaCl?
a)
58.45g/mol
b)
28g/mol
c)
12g/mol
d)
6.02 x 1023
7.
What is the molar mass of Mg3N2?
a)
191.6 g/mol
b)
76.64 g/mol
c)
38.32 g/mol
d)
100.95 g/mol
8.
How many moles are there in 12.7g of CaF2?
a)
0.20 mol
b)
1,000.76 mol
c)
6.14 mol
d)
0.16 mol
9.

Shivani measures out 6.0 moles of epsom salt (MgSO4) to put in her bath. How many grams of MgSO4 went in the bath?

a)

3.6 x 1024 g

b)

720 g

c)

0.050 g

d)

340 g

10.
Which of the following dimensional analysis setups will correctly convert 27.76g of Li to atoms of Li?
a)
A
b)
B
c)
C
d)
D
11.
What is the molar mass of Hydrogen Peroxide (H2O2)?
a)
48.10 g/mol
b)
34.02 g/mol
c)
36.54 g/mol
d)
35.51 g/mol
12.
How many moles are in 16.94 g of water?
a)
16.94 mol H2O
b)
0.9401 mol H2O
c)
305.3 mol H2O
d)
1.063 mol H2O
13.
How many moles of magnesium are in 3.01x1022 atoms of magnesium?
a)
5.00x1044 moles Mg
b)
0.050 moles Mg
c)
1.81x1046 moles Mg
d)
5 moles Mg
14.
You have 8.65 x 1025 atoms of arsenic. How many grams do you have?
a)
144 g As
b)
10,765 g As
c)
107 g As
d)
None of these
15.
How many molecules are in 3.6 grams of NaCl?
a)
0.06
b)
1.0x1021
c)
1.3x1026
d)
3.7x1022
16.
Calculate the number of atoms in 4.00 x 10-5 g of sodium.
a)
1.05 x 1018 atoms
b)
3.92 x 1019 atoms
c)
3.24 x 1023 atoms
d)
5.54 x 1020 atoms
17.
What is the mass of 1.0 x 1012 molecules of O2?
a)
1.9 x 1013 g
b)
6.0 x 1011 g
c)
5.3 x 10-11 g
d)
1.7 x 10-12 g
18.
Which one is an empirical formula?
a)
H2O2
b)
C2H6O12
c)
CaCl2
d)
N2O8
19.

C4H6

a)

CH

b)

CH3

c)

C2H3

d)

C4H6

20.
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
21.
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
a)
Mg4N3
b)
MgN2
c)
Mg3N2 
d)
MgN
22.
Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?
a)
C2H3O2
b)
CH2O
c)
C2H4O2
d)
C3H8O3
23.
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
24.
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
a)
Mg4N3
b)
MgN2
c)
Mg3N2 
d)
MgN
25.
What is the best statement for the picture. 
a)
The molecule has two carbon atoms and four hydrogen molecules. 
b)
The molecule has two carbon atoms and four hydrogen atoms. 
c)
The molecule has two carbon atoms. 
26.
What is the best formula for this molecule?
a)
2H2O2
b)
6H2O2
c)
6H12O12
d)
6HO
27.
What is the best formula for this molecule?
a)
C3H4O3
b)
C3H4O
c)
C3H4O2
d)
C3H4O4
28.
What is the best formula for this molecule?
a)
C5HO4
b)
C5HO7
c)
C5HO8
29.
What is the best formula for these molecules?
a)
H2O
b)
H2O2
c)
3H2O
d)
4H2O
30.
What is the total number of atoms in this molecule?
a)
11
b)
3
c)
8
d)
10
31.

What is the empirical of this molecule?

a)

C6H12O6

b)

C2H6O2

c)

CH2O

d)

C6H11O4

32.

What is the molecular formula for this molecule?

a)

C6H12O6

b)

C2H6O2

c)

CH2O

d)

C6H11O4

33.

Which molecules have the same empirical formula?

a)

A +B +C

b)

B + C

c)

C + D

d)

D + A

e)

A +B +C + D

34.

Which Molecule has a molecular formula of C4H8

a)

A

b)

B

c)

C

d)

D

35.

Which compounds have the same empirical formula?

a)

A + B

b)

C + D

c)

A+D

d)

B+ C

36.

How many moles is 78 grams of Li3N?

a)

34.827 moles

b)

2.24 moles

c)

78 moles

d)

20.82 moles

37.
Which of the following dimensional analysis setups will correctly convert 27.76g of Li to atoms of Li?
a)
A
b)
B
c)
C
d)
D
38.
How many moles are in 16.94g of water?
a)
16.94 mol H2O
b)
0.9401 mol H2O
c)
305.3 mol H2O
d)
1.063 mol H2O
39.
How many moles are in 9.8 grams of calcium? 
a)
0.20 moles
b)
4.1 moles
c)
1.0 mole
d)
392 moles
40.
Which of the following dimensional analysis setups will correctly convert 2.50 moles of sodium to grams of sodium?
a)
A
b)
B
c)
C
d)
D
41.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
42.
What is Avogadro's Number? 
a)
6.02 x 1023
b)
- 6.02 1023
c)
6.02 x 1022
d)
6,020,000,000,000
43.
How many molecules of sugar (C6H12O6) are in ONE mole?
a)
24 molecules
b)
180 molecules
c)
180 g
d)
6.02 x 1023 molecules
44.
Number of N atoms in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
45.
How many grams is 1.2 moles of Neon?
a)
0.05 grams
b)
16.6 grams
c)
21.2 grams
d)
24 grams
46.
Find the number of moles in 25 grams of HF?
a)
1.2 mol HF
b)
25 mol HF
c)
0.8 mol HF
d)
80. mol HF
47.
What is the molar mass of NaOH?
a)
368.0 g/mole 
b)
40.00 g/mole
c)
57.00 g/mole
d)
23.00 g/mole
48.
What are the arrows pointing to?
a)
coefficient
b)
subscripts
c)
pineapple
d)
a number
49.
BONUS! How many molecules are in 9.4 moles of AlCl3?
a)
5.66
b)
5.66x1024
c)
0.705
d)
1.25x1023
50.
Avogadro's number of representative particles is equal to one_____.
a)
kilogram
b)
gram
c)
kelvin
d)
mole
51.
What is Avogadro's Number? 
a)
6.02 x 1023
b)
- 6.02 1023
c)
6.02 x 1022
d)
6,020,000,000,000
52.
The molar mass of an element is the mass of one ____ of the element.
a)
atom
b)
molecule
c)
mole
d)
gram
53.
A mole of Neon contains
6.02 x 1023 _____.
a)
atoms
b)
formula units
c)
ions
d)
molecules
54.

How many moles of carbon are there in a pure diamond with mass 6g?

a)

0.5mol

b)

1.0mol

c)

2.0mol

d)

4.0mol

55.
What is the molar mass of NaCl?
a)
58.45g/mol
b)
28g/mol
c)
12g/mol
d)
6.02 x 1023
56.
What is the molar mass of Mg3N2?
a)
191.6 g/mol
b)
76.64 g/mol
c)
38.32 g/mol
d)
100.95 g/mol
57.
How many moles are there in 12.7g of CaF2?
a)
0.20 mol
b)
1,000.76 mol
c)
6.14 mol
d)
0.16 mol
58.

Shivani measures out 6.0 moles of epsom salt (MgSO4) to put in her bath. How many grams of MgSO4 went in the bath?

a)

3.6 x 1024 g

b)

720 g

c)

0.050 g

d)

340 g

59.
Which of the following dimensional analysis setups will correctly convert 27.76g of Li to atoms of Li?
a)
A
b)
B
c)
C
d)
D
60.
What is the molar mass of Hydrogen Peroxide (H2O2)?
a)
48.10 g/mol
b)
34.02 g/mol
c)
36.54 g/mol
d)
35.51 g/mol
61.
How many moles are in 16.94 g of water?
a)
16.94 mol H2O
b)
0.9401 mol H2O
c)
305.3 mol H2O
d)
1.063 mol H2O
62.
How many moles of magnesium are in 3.01x1022 atoms of magnesium?
a)
5.00x1044 moles Mg
b)
0.050 moles Mg
c)
1.81x1046 moles Mg
d)
5 moles Mg
63.
You have 8.65 x 1025 atoms of arsenic. How many grams do you have?
a)
144 g As
b)
10,765 g As
c)
107 g As
d)
None of these
64.
How many molecules are in 3.6 grams of NaCl?
a)
0.06
b)
1.0x1021
c)
1.3x1026
d)
3.7x1022
65.
Calculate the number of atoms in 4.00 x 10-5 g of sodium.
a)
1.05 x 1018 atoms
b)
3.92 x 1019 atoms
c)
3.24 x 1023 atoms
d)
5.54 x 1020 atoms
66.
What is the mass of 1.0 x 1012 molecules of O2?
a)
1.9 x 1013 g
b)
6.0 x 1011 g
c)
5.3 x 10-11 g
d)
1.7 x 10-12 g
67.
Which one is an empirical formula?
a)
H2O2
b)
C2H6O12
c)
CaCl2
d)
N2O8
68.

C4H6

a)

CH

b)

CH3

c)

C2H3

d)

C4H6

69.
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
70.
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
a)
Mg4N3
b)
MgN2
c)
Mg3N2 
d)
MgN
71.
Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?
a)
C2H3O2
b)
CH2O
c)
C2H4O2
d)
C3H8O3
72.
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
73.
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
a)
Mg4N3
b)
MgN2
c)
Mg3N2 
d)
MgN
74.
What is the best statement for the picture. 
a)
The molecule has two carbon atoms and four hydrogen molecules. 
b)
The molecule has two carbon atoms and four hydrogen atoms. 
c)
The molecule has two carbon atoms. 
75.
What is the best formula for this molecule?
a)
2H2O2
b)
6H2O2
c)
6H12O12
d)
6HO
76.
What is the best formula for this molecule?
a)
C3H4O3
b)
C3H4O
c)
C3H4O2
d)
C3H4O4
77.
What is the best formula for this molecule?
a)
C5HO4
b)
C5HO7
c)
C5HO8
78.
What is the best formula for these molecules?
a)
H2O
b)
H2O2
c)
3H2O
d)
4H2O
79.
What is the total number of atoms in this molecule?
a)
11
b)
3
c)
8
d)
10
80.
How many grams are in 7.5 X 1023 molecules of H2SO4
a)
98.09 g H2SO4
b)
122g H2SO4
c)
45g H2SO4
d)
100g H2SO4
81.

What is the conversion factor that should be used to determine how many molecules are there in 4.00 moles of glucose, C6H12O6?

a)
b)
c)
d)
82.

What converting from moles to the number of particles, moles is multiplied by:

a)

an equivalent value

b)

a conversion factor

c)

the number of atoms in the formula

d)

the mass of the substance

83.

Why is the mole used in chemistry?

a)

The mass of atoms is in AMUs which is too hard to convert to grams.

b)

A dozen is not a scientific amount.

c)

Chemists needed to make chemistry easier to understand.

d)

It makes counting large numbers of small particles easier.

84.

SELECT ALL CORRECT ANSWERS - The mole can be used to measure:

a)

The amount of atoms in an element

b)

The amount of molecules in a covalent substance

c)

The amount of formula units in an ionic compound

d)

The amount of mass an object has

85.

What are the units for Avogadro's number?

a)

meters

b)

particles

c)

grams

d)

liters

86.

How many grams are in

1.2 x 1024 atoms of C?

a)

23.94 grams C

b)

0.1659 grams C

c)

6.02 grams C

d)

2.394 X 1047 grams C

87.
How many atoms are in a 3.56 g sample of Cu?
a)
3.37 x 1022 Cu atoms
b)
6.02 x 1023 Cu atoms
c)
0.056 Cu atoms
d)
1 Cu atom
88.
Given 500.0 Liters of H2 gas, convert to molecules.
a)
6.74 x 1027 molecules H2
b)
1.86 x 10-20 molecules H2
c)
1.34 x 1025 molecules H2
d)
3.71 x 10-23 molecules H2
89.

What is the mass of oxygen gas in a 250 L tank?

a)

179200 g O2

b)

0.697 g O

c)

357.14 g O2

d)

178.57 g O

90.

What is the volume of 135 grams of NH3?

a)

51528 L NH3

b)

0.3537 L NH3

c)

201.33 L NH3

d)

177.46 L NH3

91.

What is the volume of 4.5 X 1025 molecules of krypton?

a)

1674.42 L Kr

b)

3.337 L Kr

c)

1.67 X 1049 L Kr

d)

1.209 X 1048 L Kr

92.

How many atoms of neon are found in 4.5 liters of neon?

a)

1.6744 X 10-22 atoms Ne

b)

1.67 X 1024 atoms Ne

c)

1.209 X 1023 atoms Ne

d)

6.068 X 1025 atoms Ne

93.

What is the mass of 78.5 liters of CO2 at STP?

a)

77387.184 g CO2

b)

154.23 g CO2

c)

3454.23 g CO2

d)

98.16 g CO2

94.
Given 3.99 x 1022 molecules of Cl2 gas, convert to Liters.
a)
5.38 x 1047 Liters Cl2
b)
2.96 Liters Cl2
c)
1.07 x 1045 Liters Cl2
d)
1.48 Liters Cl2
95.
Given 500.0 Liters of H2 gas, convert to molecules.
a)
6.74 x 1027 molecules H2
b)
1.86 x 10-20 molecules H2
c)
1.34 x 1025 molecules H2
d)
3.71 x 10-23 molecules H2
96.
Given 10.00 grams of Al2(SO4)3, convert to molecules of Al2(SO4)3.
a)
2.06 x 1027 molecules
b)
1.76 x 1022 molecules
c)
4.85 x 10-26 molecules
d)
5.68 x 10-21 molecules
97.
How many atoms are in a 3.56 g sample of Cu?
a)
3.37 x 1022 Cu atoms
b)
6.02 x 1023 Cu atoms
c)
0.056 Cu atoms
d)
1 Cu atom
98.
How many significant figures does the following number have?
0.00345
a)
6
b)
5
c)
3
d)
Ambiguous: 3,4,5, or 6
99.
How many significant figures does the following number have: 0.00204
a)
6
b)
4
c)
3
d)
2
100.

How many significant figures does the following number have?1.2500 x 10310^3  

a)
5
b)
3
c)

Ambiguous: 3 or 5

d)

7

101.
How many significant figures does the following number have: 100.00210
a)
7
b)
8
c)
10
d)
Ambiguous: 7 or 8
102.
Round 1289 to three significant figures
a)
1290
b)
130
c)
1300
d)
1.29x103
103.
What is 98.907 rounded to 1 significant figure?
a)
98.9
b)
90
c)
100
d)
1x102
104.
Solve and give your answer with the correct number of significant figures
(12.470)(271)
a)
3366.9
b)
3.37x103
c)
3400
d)
3370
105.
Solve and give your answer with the correct number of significant figures
(12.470)(271)
a)
3366.9
b)
3.37x103
c)
3400
d)
3370
106.
Solve and give your answer with the correct number of significant figures
129.6/3
a)
43.0
b)
43
c)
 4x101
d)
40
107.
Solve and give your answer with the correct number of significant figures
24.28 + 12.5
a)
3.687 x 101
b)
36.8
c)
37
d)
3.70x101
108.
Round 1235 to 2 significant figures.
a)
12
b)
1200
c)
1200.
d)
1200.00
109.

Round the following value to one significant figure...


8291

a)

8000

b)

9000

c)

7000

d)

8300

110.

What is 78.5 rounded to one significant figure?

a)

79

b)

78.5

c)

70

d)

80

111.

0.0015289


Round to 3 significant figures.

(a)  

112.

Solve and use the correct number of sig figs: 123 x 3.34

a)

411

b)

410.82

c)

410.8

d)

410

113.

Solve and use the correct sig figs: 4.70  ÷\div  3.0001

a)

1.56661445

b)

1.57

c)

1.5667

d)

1.6

114.

Solve and use the correct sig figs: 15.65 x 0.23

a)

3.5995

b)

3.6

c)

4.0

d)

3.60

115.
How many sig figs are in the red number?
4.00 x 108 mm
a)
1
b)
3
c)
9
d)
infinite
116.
How many Significant Figures in the number below?
0.456
a)
3
b)
4
c)
2
d)
1
117.

Which one is rounded to the correct number of significant figures for the following equation?

7520 x 0.021 = 157.92

a)

157.92

b)

157.9

c)

158

d)

160

118.
How many sig. fig. are in the number below:
106.00
a)
2
b)
3
c)
4
d)
5
119.
How many sig. fig. are in the number below:
0.056
a)
1
b)
2
c)
3
d)
4
120.
How many sig. fig. are in the number below:
0.678
a)
1
b)
2
c)
3
d)
4
121.
How many sig. fig. are in the number below:
705000
a)
2
b)
3
c)
5
d)
6
122.
Which measurement contains 3 sig figs?
a)
200 mL
b)
20.0 mL
c)
0.02 mL
d)
0.020mL
123.

Convert the following to scientific notation.

0.000480

a)

4.8 x 10-4

b)

4.80 x 10-4

c)

48 x 10-5

d)

4.80 x 104

124.
Round 1047.78 to three sig figs
a)
104
b)
105
c)
1050
d)
1050.00
125.
What is 98.907 rounded to 1 significant figure?
a)
98.9
b)
90
c)
100
d)
98.91
126.
Calculate the answer to the following problem and round the final answer to the correct number of sig figs:
4.627 / 0.00371 = 
a)
1247.169811
b)
1250
c)
1247
d)
1240
127.
Calculate the answer to the following problem and round the final answer to the correct number of sig figs:
24.567 + 0.04478 =
a)
24.61178
b)
24.612
c)
24.611
d)
24.61
128.

Write the answer to this calculation in the correct number of significant figures 240 x 23.0001 =

a)

5500

b)

5500.

c)

5520.024

d)

0.55

129.

109.0/67.9

a)

1.60

b)

1.605

c)

1.61

d)

1.60530

130.
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
a)
Mg4N3
b)
MgN2
c)
Mg3N2 
d)
MgN
131.
You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.
a)
SO
b)
SO2
c)
SO3
d)
SO4
132.
Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?
a)
C2H3O2
b)
CH2O
c)
C2H4O2
d)
C3H8O3
133.
What is the percent by mass of sodium in NaCl?
a)
39%
b)
61%
c)
35%
d)
65%
134.
What is the percent by mass of chlorine in NaCl?
a)
39%
b)
61%
c)
35%
d)
65%
135.
What is the percent by mass of oxygen in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
136.

Magnesium bromide (one magnesium atom with two bromine atoms) has a chemical formula of MgBr2. If you look at the total atomic mass of MgBr2, does magnesium or bromine make up more of the mass?

a)

bromine

b)

magnesium

c)

they are exactly the same

d)

it is impossible to tell

137.

Lithium phosphide (three lithium atoms with one phosphorus atom) has a chemical formula of Li3P. If you look at the total atomic mass of Li3P, does lithium or phosphorus make up more of the mass?

a)

lithium

b)

phosphorus

c)

they are exactly the same

d)

it is impossible to tell

138.
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
139.

What is the empirical formula for C4H6?

a)

CH

b)

CH3

c)

C2H3

d)

C4H6

140.

What is the empirical formula for N2S3?

a)

NS

b)

N3S2

c)

N2S3

d)

N1S1.5

141.

Si2F6

Choose the correct empirical formula...

a)

SiF

b)

Si2F6

c)

SiF3

d)

Si6F2

142.

C2F6

Choose the correct empirical formula...

a)

CF

b)

C2F6

c)

C6F2

d)

CF3

143.
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
144.
What is the best formula for this molecule?
a)
C3H4O3
b)
C3H4O
c)
C3H4O2
d)
C3H4O4
145.
What is the best formula for these molecules?
a)
H2O
b)
H2O2
c)
3H2O
d)
4H2O
146.
What is the best formula for this molecule?
a)
C3H2
b)
C3H8
c)
CH
d)
CH8
147.
What is the total number of atoms in this molecule?
a)
2
b)
4
c)
1
d)
6
148.
What is the total number of atoms in this molecule?
a)
10
b)
5
c)
15
d)
20

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