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CHEMICAL ENGINEERING QUIZ 1

Total questions: 60

Worksheet time: 2hrs 56mins

Name
Class
Date
1.

Which of the following statements regarding the mole is INCORRECT?

a)

A mole is a unit of quantity equal to 6.02 x 1023 particles.

b)

The number of particles in a mole is known as Avogadro’s number.

c)

A mole of particles of an element is numerically equal to the atomic mass of the element.

d)

none of the above

2.

The mass of one mole of an element is equal to

a)

its atomic number from the periodic table, but in amus.

b)

its atomic mass from the periodic table, but in amus.

c)

its atomic mass from the periodic table, but in grams.

d)

its atomic number from the periodic table, but in grams.

3.

What is the molar mass of PbSO4?

a)

303.27 g/mol

b)

255.27 g/mol

c)

163.87 g/mol

d)

372.27 g/mol

4.

How many formula units are in 2.5 moles of NaCl?

a)

1.5 x1024 formula units

b)

1.5 formula units

c)

4.2 formula units

d)

4.2 x10-24 molecules

5.

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

6.
How many molecules are there in 31.8 moles of water?
a)
5.28 x 10-23 molecules
b)
1.91 x 1025 molecules
c)
5.28x 10-25
d)
1.91 x 1022
7.

Determine the mass of 4.20 moles of C6H12

a)

353 g

b)

0.0499 g

c)

337 g

d)

2.53 x 1024 g

8.

Which of the following dimensional analysis setups will correctly convert 27.76 g of Li to atoms of Li?

a)

A

b)

B

c)

C

d)

D

9.

What is the mass of 1.2 x 1024 atoms of C?

a)

2.0 grams

b)

24 grams

c)

0.17 grams

d)

1.4 x 1025 grams

10.

Calculate the number of atoms in 0.0340 g Zn.

a)

5.20 x 10-4 atoms Zn

b)

3.13 x 1023 atoms Zn

c)

3.13 x 1020 atoms Zn

d)

2.05 x 1022 atoms Zn

11.

How many grams are in 1.2 moles of neon?

a)

0.059 grams

b)

7.2 x 1023 grams

c)

2.0 x 10-24 grams

d)

24 grams

12.

How many moles are in 98.3 grams of aluminum hydroxide, Al(OH)3?

a)

1.26 moles

b)

0.8 moles

c)

7,670 moles

d)

1.63 x 10-22 moles

13.

Which of the following dimensional analysis setups will correctly convert 4.00x1023atoms of cobalt to moles of cobalt? How many moles of colbalt are there?

a)

setup B : 0.664 mol Co

b)

setup A: 2.41x1047mol Co

c)

setup A : 0.664 mol Co

d)

setup B: 2.41x1047mol Co

14.
How many formula units are there in 2.45 moles potassium chloride?
a)
4.07 x 10-24 
b)
1.47 x 1024 
c)
1.47
d)
4.07
15.

What is the molar mass of table salt (NaCl)? Read all options! Be careful!

a)

58.44 amu

b)

35.45 g/mol

c)

22.99 g/mol

d)

58.44 g/mol

16.

To melt the ice, Juan throws 455 g of calcium chloride, CaCl2 on his sidewalk. How many moles of CaCl2 did he throw?

a)

50,500 moles

b)

4.10 moles

c)

7.56 x 10-22 moles

d)

111 moles

17.
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
18.
Which of the following is considered an empirical formula?
a)
CH3COOH
b)
C6H12O6
c)
H2O
19.
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
20.

How many molecules are in 2.5 mol of NaCl?

a)

1.5 x 1024 molecules

b)

1.5 molecules

c)

4.15 molecules

d)

1.5 x 1023 molecules

21.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
22.
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
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.
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
25.

2.40 g of an explosive, J, contains 0.473 g of nitrogen. J also contains 33.8% carbon and 1.41% hydrogen by mass. The remainder of J is oxygen.


What is the empirical formula of J?

a)

C4HNO2

b)

CH2N2O

c)

C2HNO2

d)

CHNO

26.

2.40 g of an explosive, J, contains 0.473 g of nitrogen. J also contains 33.8% carbon and 1.41% hydrogen by mass. The remainder of J is oxygen.


What is the empirical formula of J?

a)

C4HNO2

b)

CH2N2O

c)

C2HNO2

d)

CHNO

27.

What is the concentration of a solution if 0.25 mol is dissolved in 500 cm3 of solution?

a)

1 mol/dm3

b)

2 mol/dm3

c)

0.5 mol/dm3

28.

What mass of CO2 will be produced when 50 g of CaCO3 decomposes?

a)

22g

b)

44g

c)

11g

29.

If a solution of NaOH is 0.1 mol/dm3, what is its concentration in g/dm3?

a)

40 g/dm3

b)

4 g/dm3

c)

0.4 g/dm3

30.

What is the empirical formula for hydrogen peroxide which has a molecular formula of H2O2?

a)

HO

b)

H2O2

c)

H2O

31.

The empirical formula for a compound is CH2 and its relative atomic mass (Ar) is 70. What is its molecular formula? Use the periodic table to help you.

a)

CH2

b)

C5H10

c)

C70H140

32.

If 2.8 g of nitrogen combines with 6.4 g of oxygen, what is the empirical formula of the nitrogen oxide formed? Use the periodic table to help you.

a)

NO

b)

N2O

c)

NO2

33.

What is the percentage yield if the actual yield was 2.4 g and the predicted yield was 3.0 g?

a)

75%

b)

80%

c)

125%

34.

What mass of cobalt must have reacted if 3.20 g of oxygen forms 7.92 g of cobalt oxide?

a)

3.20 g

b)

4.72 g

c)

7.92 g

35.

What is the concentration of a solution formed by dissolving 4 g of potassium hydroxide in 200 cm3 of water?

a)

0.05 g /cm3

b)

0.02 g/dm3

c)

20 g/dm3

36.

If 24 g of magnesium reacts with 16 g of oxygen to produce 40 g of magnesium oxide, what mass of magnesium would you need to start with to produce 10 g of magnesium oxide?

a)

6 g of magnesium

b)

12 g of magnesium

c)

4 g of magnesium

37.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
38.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
39.

How many different types of elements are in C6H12O6?

a)

1

b)

2

c)

3

d)

4

40.

What is the number before a chemical formula called?

Example: 2H2 + O2 ---> 2H2O

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

41.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
42.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
43.
Is the following equation balanced?
4Fe + 3O2 --> 2Fe2O3
a)
yes
b)
no
44.

Balance the following:


_P4+_O2 → _P2O3

a)

3 P4+1 O2 → 2 P2O3

b)

1 P4+1 O2 → 2 P2O3

c)

1 P4+ 3 O2 → 2 P2O3

d)

1 P4+ 2 O2 → 3 P2O3

45.

Balance the following:


_AlBr3 + _K2SO4 → _KBr + _Al2(SO4)3

a)

6 AlBr3 + 1 K2SO4 → 6 KBr + 1 Al2(SO4)3

b)

2 AlBr3 + 3 K2SO4 → 6 KBr + 1 Al2(SO4)3

c)

1 AlBr3 + 1 K2SO4 → 2 KBr + 3 Al2(SO4)3

d)

2 AlBr3 + 3 K2SO4 → 1 KBr + 2 Al2(SO4)3

46.

Balance the following:


_SO2 + _Li2Se →_SSe2 + _Li2O

a)

1 SO2 + 2 Li2Se → 1 SSe2 + 2 Li2O

b)

1 SO2 + 1 Li2Se → 2 SSe2 + 2 Li2O

c)

2 SO2 + 2 Li2Se → 2 SSe2 + 2 Li2O

d)

2 SO2 + 2 Li2Se → 1 SSe2 + 1 Li2O

47.

Balance the following:


_Cu + _HCl →_H2 + _CuCl2

a)

2 Cu + 2 HCl → 2 H2 + 6 CuCl2

b)

2 Cu + 2 HCl → 4 H2 + 6 CuCl2

c)

1 Cu + 2 HCl → 3 H2 + 4 CuCl2

d)

1 Cu + 2 HCl → 1 H2 + 1 CuCl2

48.

Balance the following:


_NaF + _Br2 →_NaBr + _F2

a)

1NaF + 2 Br2 →1 NaBr + 2 F2

b)

2NaF + 2 Br2 → 2 NaBr + 2 F2

c)

2 NaF + 3 Br2 → 1 NaBr + 2 F2

d)

2 NaF + 1 Br2 → 2 NaBr + 1 F2

49.

How many atoms of aluminum are on each side of the following balanced chemical equation: 4Al + 3O2 --> 2Al2 O3

a)

2

b)

6

c)

1

d)

4

50.

Balance the following:


H2 + N2 → NH3

a)

H2 + 4N2 → NH3

b)

H2 + 3N2 → 2NH3

c)

3H2 + N2 → 2NH3

d)

2H2 + 2N2 → 2NH3

51.

Balance the following:


_ C3H8 + _ O2 → _ CO2 + _ H2O

a)

2 C3H8 + 7 O2 → 6 CO2 + 8 H2O

b)

1 C3H8 + 2 O2 → 3 CO2 + 4 H2O

c)

1 C3H8 + 5 O2 → 3 CO2 + 4 H2O

d)

4 C3H8 + 3 O2 → 2 CO2 + 1 H2O

52.

Balance the following:


_KOH + _H2S →_K2S + _H2O

a)

2 KOH + 3 H2S → 1 K2S + 2 H2O

b)

2 KOH + 1 H2S → 1 K2S + 2 H2O

c)

3 KOH + 1 H2S → 1 K2S + 2 H2O

d)

2 KOH + 1 H2S → 1 K2S + 5 H2O

53.

Balance the following:


_H3PO4 + _HCl →_PCl5 + _H2O

a)

1 H3PO4 + 5 HCl → 1 PCl5 + 4 H2O

b)

2 H3PO4 + 3 HCl → 2 PCl5 + 6 H2O

c)

1 H3PO4 + 10 HCl → 2 PCl5 + 8 H2O

d)

1 H3PO4 + 7 HCl → 2 PCl5 + 5 H2O

54.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
55.

How many atoms of hydrogen (H) are in C6H12O6?

a)

3

b)

6

c)

12

d)

24

56.

Balance the the following 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

57.

Balance the equation.

__Mg + __Cl2 --> __MgCl2

a)

1, 2,1

b)

already balanced

c)

2,1,1

d)

1,1,2

58.

Number IN FRONT of reactants or products

a)

product

b)

reactant

c)

coefficient

d)

subscript

59.
Ice melting
a)
Chemical Change
b)
Physical Change
60.
What happens in ALL chemical changes?
a)
Change in state of matter
b)
A new substance is formed
c)
Bubbles are produced
d)
An explosion

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