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2025 Updated CHEM Review Questions for Sem II

Total questions: 80

Worksheet time: 1hrs 25mins

Name
Class
Date
1.

Which type of chemical reaction is defined by this equation:

AB + CD --> AD + CB

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

2.

Which type of chemical reaction is defined by this equation: AB + C --> A + CB

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

3.

Which type of chemical reaction is defined by this equation: A + B --> AB

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

4.

Which type of chemical reaction is defined by this equation: AB --> A + B

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

5.

What type of chemical reaction is this equation: 2H2O → 2H2+ O2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

6.

What type of chemical reaction is this equation: 2Al + 3NiBr2→ 2AlBr3+ 3Ni

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

7.

Which type of chemical reaction is this equation: N2 + 3H2→ 2NH3

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

8.

What is absolute zero?

a)

An object has reached a temperature of negative Kelvins.

b)

The density of an object is equal to 1/2 the specific heat.

c)

Science is unable to distinguish an object as a sold, liquid, or gas.

d)

The molecules in an object stop moving due to zero kinetic energy.

9.

Heat is energy in the process of being transferred from:

a)

hot objects to cold objects

b)

low pressure to high pressure

c)

cold objects to hot objects

d)

high pressure to low pressure

10.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

11.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

12.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

13.

What is the theoretical temperature when all motion stops?

a)

0 kelvin

b)

0 Fahrenheit

c)

-273 kelvin

d)

0 celsius

14.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

15.
__Na + __Cl2 --> __NaCl
a)
1,1,2
b)
2,1,2
c)
2,1,1
d)
already balanced
16.
__BF3 + __Li2SO3 --> __B2(SO3)3 + __LiF
a)
2,3,1,3
b)
2,3,1,6
c)
4,4,2,12
d)
3,3,1,9
17.
Balance this equation:
 2Li + Cl2 -> LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
18.
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. 
19.
Balance this equation:
MgCl2 --> Mg4+ Cl2
a)
It's already balanced.
b)
4MgCl2 --> Mg4+ 4Cl2
c)
4MgCl2 --> Mg4+ 5Cl2
20.
Fill in the blanks with coefficient:
PCl5+_ H2O→_ HCl+H3PO4
a)
4, 5
b)
1, 6
c)
3, 8
d)
2,2
21.
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
22.

Boyle's PV law : When _______ is held constant, the pressure and volume of a gas are ________ proportional

a)

temperature, equally

b)

temperature, inversely

c)

mass, equally

d)

mass, inversely

23.

Boyle's law : The pressure and volume of a gas show a _____ relationship.

a)

Inverse

b)

Direct

24.

Whose law states that as pressure goes up, volume goes down?

a)

Mazias

b)

Boyle

c)

Charles

d)

Aglow

25.

Charles' Law States...

a)

As Volume goes up temperature goes up 

b)

As Pressure goes down volume goes down 

c)

As Pressure goes up volume goes down

d)

As Pressure goes up temperature goes up

26.

As temperature rises ___________.

a)

an atom's kinetic energy decreases

b)

an atom's kinetic energy increases

c)

an atom's kinetic energy stays the same

27.

The more energy that particles have, the ___ they move.

a)

faster

b)

slower

28.

Which is a quality that only gases display?

a)

Spread out to fill all available space

b)

Can be compressed

c)

Take the shape of their container

d)

All of these

29.

Gas molecules have no mass

a)

Fales

b)

True

30.

Gas has no definite volume

a)

Fales

b)

True

31.

How do gas molecules move?

a)

in a circular motion

b)

in straight line paths

c)

in an orderly fashion

d)

constantly and randomly

32.

Boyle's PV law : When _______ is held constant, the pressure and volume of a gas are ________ proportional

a)

temperature, equally

b)

temperature, inversely

c)

mass, equally

d)

mass, inversely

33.

Boyle's law : The pressure and volume of a gas show a _____ relationship.

a)

Inverse

b)

Direct

34.

Whose law states that as pressure goes up, volume goes down?

a)

Mazias

b)

Boyle

c)

Charles

d)

Aglow

35.

Charles' Law States...

a)

As Volume goes up temperature goes up 

b)

As Pressure goes down volume goes down 

c)

As Pressure goes up volume goes down

d)

As Pressure goes up temperature goes up

36.

You leave a soccer ball outside in the winter. Will the ball end up flatter than it was before?

a)

Only if it's REALLY cold

b)

No

c)

Only if it has a leak

d)

Yes

37.

As temperature rises ___________.

a)

an atom's kinetic energy decreases

b)

an atom's kinetic energy increases

c)

an atom's kinetic energy stays the same

38.

The more energy that particles have, the ___ they move.

a)

faster

b)

slower

39.

The Ideal Gas Law is understood as: PV=nRT. How does the Ideal Gas Law explain how a hot air balloon rises in the sky?

a)

P is a constant. So as T increases as the air is heated at constant n, volume of the balloon increases causing it to rise.

b)

P and V are kept constant, so as T increases, n must decrease causing the balloon to rise.

c)

V is constant, so as T increases at a constant n, pressure increases causing the balloon to rise.

d)

None of these

40.
Charles' Law States...
a)
As Pressure goes up volume goes down
b)
As Pressure goes up temperature goes up
c)
As Volume goes up temperature goes up 
d)
As Pressure goes down volume goes down 
41.
Calculate the volume that a 0.323-mol sample of a gas will occupy at 265 K and a pressure of 0.900 atm.
a)
7.18 L 
b)
7.81 L
c)
4.63 L
d)
4.36 L
42.

Determine the temperature required for 0.0470 mol of gas to fill a balloon to 1.20 L under .998 atm pressure.

a)

0 K

b)

107 K

c)

207 K

d)

307 K

43.

A sample of gas with a volume of 30.0 mL at 25.0oC is heated to 50.0oC. What is the new volume of the gas?

a)

60.0 mL

b)

15.0 mL

c)

27.5 mL

d)

32.5 mL

44.

Absolute zero is

a)

0 K

b)

where there is no molecular movement

c)

the coldest temperature possible

d)

all of these

45.

What is the pressure exerted by 5.00 moles of nitrogen gas contained in a 30.0 Liter container at 25.0 °C?

a)

3670 atm

b)

0.245 atm

c)

4.08 atm

d)

605 atm

46.

A fire burning would be an example of an _____ reaction.

a)

endothermic

b)

exothermic

47.

Chemicals that end in a chemical reaction are called _____.

a)

products

b)

reactants

48.

As the reaction progresses in an ____ reaction, the temperature of the reaction decreases.

a)

exothermic

b)

endothermic

49.

In a laboratory, a student combines vinegar and baking soda into a beaker. The initial temperature is 28 degrees Celsius and the final temperature reading two minutes later is 20 degrees Celsius. Was energy absorbed from or released to the surroundings?

a)

absorbed from

b)

released to

50.
If a balloon is cooled what will happen to the volume?
a)
Volume will increase
b)
Volume will decrease
c)
Volume will not change
51.

What type of relationship exists between volume and pressure?

a)

avogadro's relationship

b)

direct relationship

c)

charles relationship

d)

inverse relationship

52.
How are Volume and Temperature related?
a)
Inversely
b)
Directly
c)
Indirectly
d)
Constant
53.
How are Pressure and Temperature related?
a)
Inversely
b)
Directly
c)
Indirectly
d)
Constants
54.
A gas is at a pressure of 12 atm, a volume of 23 L, and a temperature of 200K. If the pressure is raised to 14 atm,  and the temperature is increased to 300K. What is the new volume of the gas?
a)
P1V1/T1 + P2V2/T2
b)
PV = nRT
c)
P1V1 = P2V2
d)
P1/T1 = P2/T2
55.
A 1.25 L volume of gas contains 4.5 moles.  How many moles will be in 0.75 L?
a)
PV = nRT
b)
P1V1 = P2V2
c)
P1V1/T1 = P2V2/T2
d)
V1/n1 = V2/n2
56.
Convert 300 K to oC
a)
27oC
b)
0oC
c)
-27oC
d)
573oC
57.

A liquid's freezing point is -38°C and its boiling point is 357°C. How many Kelvins are there between the boiling point and the freezing point of this liquid?

a)

319

b)

357

c)

395

d)

592

58.
If a glass of water warms to 78 degrees celsius, what is it's temperature in Kelvin?
(Kelvin = C + 273)
a)
-195
b)
78
c)
350
d)
351
59.

Convert: 253 °C to K:

a)

526 K

b)

625 K

c)

0 K

d)

186 K

60.

Which column in the table includes only chemical changes?

a)

A

b)

B

c)

C

d)

D

61.

During a science class investigation, a teacher places a small amount of sugar in a beaker and heats it over a candle.  Which of the following would be the best evidence that a change in the chemical properties of the sugar has taken place?

a)

The sugar gets hotter.

b)

The sugar gets larger.

c)

The sugar turns into a liquid.

d)

The sugar turns black.

62.

A student had a beaker with a small amount of baking soda.  The student added a few drops of pickle juice to the baking soda and observed fizzing and bubbling.  Based on observation, which of these can the student conclude?

a)

A chemical reaction produced a solid.

b)

No chemical reaction took place.

c)

Only a physical change happened.

d)

A chemical reaction produced a gas.

63.

True or False: Solubility is the extent to which a substace dissolves in a liquid.

a)

True

b)

False

64.

When a substance does not dissolve in a liquid at all, which type of solubility is that known as?

a)

High Solubility

b)

Low Solubility

c)

No Solubility

65.
Which solute is the most soluble at 10 ⁰C?
a)
KI
b)
KClO3
c)
NH4Cl
d)
NH3
66.
Which solute is the least soluble at 90 ⁰C?
a)
SO2
b)
KClO3
c)
KI
d)
HCl
67.
What is the minimum temperature needed to dissolve at least 10 g of KClO3?
a)
25 ⁰C
b)
10 ⁰C
c)
5 ⁰C
d)
100 ⁰C
68.
A solution of potassium chlorate, KClO3, has 20 grams of the salt dissolved in 100 grams of water at 70 ºC. Approximately how many more grams of the salt can be added to the solution before reaching the saturation point?
a)
10 grams
b)
30 grams
c)
80 grams
d)
60 grams 
69.

How many neutrons are in 1 atom of Carbon-13?

a)

6

b)

13

c)

7

d)

20

70.

Different isotopes of an element contain different numbers of ___.

a)

protons

b)

neutrons

c)

electrons

d)

elements

71.

How many neutrons does this bromine atom have?

a)

35

b)

45

c)

80

72.

4CF2Cl2

a)

C = 4, F = 4, Cl = 2

b)

C = 1, F = 8, Cl = 8

c)

C = 4, F = 8, Cl = 8

d)

C = 1, F = 4, Cl = 8

73.
What is the definition of solubility?
a)
The ability of a substance to change state
b)
The ability of a substance to dissolve in a solvent
c)
The ability of a substance to evaporate
d)
The ability of a substance to conduct electricity
74.
How can solubility graphs/curves be used to predict the solubility of a compound at a specific temperature?
a)
By conducting a titration
b)
By consulting the solubility graphs/curves
c)
By analyzing the molecular structure of the compound
d)
By measuring the density of the compound
75.
What is solubility?
a)
The ability of a substance to dissolve in a solvent
b)
The ability of a substance to conduct electricity
c)
The ability of a substance to evaporate
d)
The ability of a substance to change color
76.
When a nucleus undergoes nuclear decay by gamma rays, the atomic number of the element....
a)
remains the same
b)
  decreases by one.
c)
increases by one.
d)
increases by two.
77.

Solve this equation for alpha decay.

85209At = ___ + 24He (If you need to sing to remember, please do...)

a)

83205Bi

b)

86209Rn

c)

81207Tl

d)

85208At

78.

The three types of nuclear radiation in increasing order of penetrating power are ____.

a)

alpha, beta, gamma

b)

X ray, beta, gamma

c)

alpha, gamma, beta

d)

X ray, gamma, beta

79.

Gamma radiation has

a)

the mass of an electron and a charge of +1

b)

the mass of an electron and a charge of -1

c)

a mass of 4 AMU and a charge of 2+

d)

no mass or charge

80.

What do protons, electrons and neutrons make?

a)

element

b)

compound

c)

atom

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