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Chemistry (2nd Semester) Final Exam Unit Practice

Total questions: 60

Worksheet time: 1hrs 25mins

Name
Class
Date
1.
The compound CHO is...
a)
inorganic
b)
organic
2.
Which compound is inorganic?
a)
Glucose (C₆H₁₂O₆)
b)
Ethane (C₂H₆)
c)
Carbon Dioxide (CO₂)
d)
Stearic Acid (C₁₈H₃₆O₂)
3.

Which of these compounds is not an acid?

a)

HCl

b)

NaOH

c)

HNO3

d)

H2SO4

4.
Which compound below is Organic?
a)
C6H12O6
b)
H2O
c)
N2
d)
BaBr2
5.
Which of the following compounds is Inorganic
a)
BaBr2
b)
C21H29N2O6P3
c)
C6H12O6
d)
P3C5H3
6.

(SELECT 2) A mole is equal to:

a)

6.02x1023

b)

kelvin

c)

Avogadro's Number

d)

The Molar Mass

7.

What is a mole in chemistry?

a)

It is still just an animal

b)

A unit of representative particles

c)

The mass of something

d)

The lowest whole-number ratio of elements

8.
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
9.

Alloys are created to improve the working properties and appearance of metals, they are made by cobining two or more elements.

a)

True

b)

False

10.
Gain or lose electrons
a)
Ionic Bonds
b)
Covalent Bonds
c)
Both bonds
d)
Neither bond
11.
Share electrons
a)
Ionic Bonds
b)
Covalent Bonds
c)
Both bonds
d)
Neither bond
12.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
13.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
14.
The noble gases have how many valence electrons?
a)
1
b)
2
c)
7
d)
8
15.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
16.

CaCO3 represents a

a)

Symbol

b)

Formula

c)

Subscript

d)

Coefficient

17.
Balance this equation...
HgO --> Hg + O2
a)
It is balanced 
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
d)
I don't know...Oh well!
18.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
19.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
20.
6CO2 contains
a)
6 carbon atoms, 2 oxygen atoms
b)
12 carbon atoms, 12 oxygen atoms
c)
6 carbon atoms, 12 oxygen atoms
d)
12 carbon atoms, 6 oxygen atoms
21.
Fe2O3 has
a)
2 Iron atoms, 3 oxygen atoms
b)
6 iron atoms, 6 oxygen atoms
c)
3 iron atoms, 2 oxygen atoms
d)
1 iron atom, 6 oxygen atoms
22.
6CO2 + 6H2O contains how many elements
a)
4
b)
36
c)
3
d)
2
23.
The Law of Conservation of Mass proves that -
a)
the number of atoms in a chemical reaction does not change
b)
there are more atoms on the reactant side than the product side
c)
there are more atoms on the product side than the reactant side
d)
the mass of the product will not equal the reactants
24.
You know you a chemical reaction has occurred if 
a)
there is a precipitate.
b)
there is a color change.
c)
there is a temperature change.
d)
All of these answers are evidence.
25.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
the number of atoms
d)
None of the answers are correct
26.
The blue numbers in the image below represent ________
a)
the number of compounds
b)
coefficients
c)
subscripts
d)
none of the answers are correct
27.

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

28.
What is the molar mass of H2O?
a)
6.02 x 1023
b)
16 grams
c)
18 grams
d)
15.99999 grams
29.
What is the mass of one mole of aluminum?
a)
27 g
b)
13 g
c)
54 g
d)
14 g
30.
How many particles are in a mole?
a)
602
b)
602 million
c)
602 moles
d)
6.02 x 1023
31.

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

32.
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
How many grams of Al2(SO4)3 would be formed if 250g H2SO4 completely reacted with aluminum?
a)
0.85 g
b)
290 g
c)
450 g
d)
870 g
33.
What is the percent by mass of magnesium in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
34.
What is the percent by mass of fluorine in CaF2 (gram-formula mass = 78 g/mol)?
a)
24%
b)
49%
c)
51%
d)
65%
35.
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%
36.

In the equation 2 Al2O3 --> 4 Al + 3 O2, what is the mole ratio of aluminum to oxygen?

a)

10:6

b)

3:4

c)

4:3

d)

2:3

37.

Using the reaction below,

4Al + 3O2 → 2Al2O3

How many moles of aluminum oxide are produced from 6 moles of oxygen?

a)

8 mol

b)

6 mol

c)

4 mol

d)

2 mol

38.
What is the empirical formula for C3H8
a)
CH
b)
C3H8
c)
C6H16
d)
CH2.7
39.

Br2O6

a)

BrO3

b)

Br6O2

c)

BrO

d)

Br2O6

40.

Si2F6

a)

SiF

b)

Si2F6

c)

SiF3

d)

Si6F2

41.

What percent of zinc sulfide (ZnS) is zinc?

a)

97.4%

b)

67.1%

c)

32.9%

d)

63.55%

42.
Pure water has a pH of 7. Pure water _______.
a)
is a base
b)
is a neutral substance
c)
could be either an acid or a base
d)
is an acid
43.
Turns litmus red
a)
Acids
b)
Bases
c)
All
44.

According to the pH scale, which item is more acidic than lemons?

a)

battery

b)

vinegar

c)

milk

d)

blood

45.

According to the pH scale, which item is a stronger base than soap?

a)

baking soda

b)

ammonia solution

c)

tomato

d)

bleach

46.
hydrochloric acid
a)
HCl
b)
HClO
c)
H3ClO3
d)
HClO3
47.

What happens when kinetic energy increases?

a)

Temperature increases.

b)

Temperature decreases.

c)

Temperature is not affected by kinetic energy.

48.

A liquid has _________ temperature than a solid.

a)

Higher

b)

Lower

49.

In an exothermic reaction, heat is a...

a)

product

b)

reactant

50.

In an endothermic reaction, heat is a...

a)

product

b)

reactant

51.

If you touch an exothermic reaction, it will feel...

a)

hot

b)

cold

52.

If you touch an endothermic reaction, it will feel...

a)

hot

b)

cold

53.

The graph is showing an ____________ reaction.

a)

exothermic

b)

endothermic

54.

The graph is showing an _________ reaction

a)

endothermic

b)

exothermic

55.
What unit do you use to measure Thermal Energy?
a)
J/Kg ºC
b)
Kg
c)
ºC
d)
J
56.

What does "q" mean?

a)

A change in temperature

b)

A change in heat energy

c)

A measure of kinetic energy

57.

What does "ΔT" mean?

a)

A change in temperature

b)

A change in heat

c)

An initial temperature

d)

A final temperature

58.

Given the potential energy diagram. Which numbered interval represents the activation energy of the reaction?

a)

1

b)

2

c)

3

d)

4

59.
Covalent bonds are between...
a)
Metal and Non-metal
b)
Non-metal and Non-metal
c)
Metal and Metal
60.
Ionic bonds are between...
a)
Metal and Non-metal
b)
Non-metal and Non-metal
c)
Metal and Metal

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