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iGCSE Physical Chemistry

Total questions: 107

Worksheet time: 2hrs 40mins

Name
Class
Date
1.

Which of the following is true about the formation of bonds between molecules?

a)

Energy is given off when bonds are formed between molecules.

b)

Energy is absorbed by the molecule when bonds are formed.

c)

Energy is neither given off nor absorbed when bonds are formed.

2.

Which of the following statement is true about the breaking of bonds between molecules?

a)

To break a bond between molecules, energy must be released by the molecule

b)

To break a bond between molecules, no energy is needed.

c)

To break a bond between molecules, energy must be absorbed by the molecule.

3.
Which letter corresponds to the energy of the products?
a)
A
b)
B
c)
C
d)
D
4.
If ∆H is negative, the reaction is?
a)
exothermic
b)
endothermic
5.
ΔH value in an endothermic reaction is a positive number.
a)
True
b)
False
6.

The energy level diagram for the reaction between magnesium and hydrochloric acid is shown.

a)

Energy is given out during the reaction

b)

The products are at a lower energy level than the reactants

c)

The reaction is endothermic.

7.

Which reaction is endothermic?

a)

acid neutralising alkali causing a temperature increase

b)

adding magnesium to hydrochloric acid

c)

calcium carbonate decomposing when heated combustion of fossil fuels

8.
In an endothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released 
9.
Is photosynthesis an exothermic or endothermic reaction?
a)
Endothermic
b)
Exothermic
c)
Neither
10.

The initial temperature was measured to be 20oC and the final temperature was 10oC. The reaction was

a)

exothermic

b)

endothermic

11.

The initial temperature was measured to be 20oC and the final temperature was 45oC. The reaction was

a)

exothermic

b)

endothermic

12.
Is the combustion of gasoline endothermic or exothermic?
a)
Endothermic
b)
Exothermic
13.

What type of reaction is this?

a)

Exothermic

b)

Endothermic

c)

Energy Producing

d)

No way to tell

14.

The graph above is from which type of reaction?

a)

Endothermic reaction

b)

Exothermic reaction

15.
Melting 
a)
exothermic
b)
endothermic
16.

In an exothermic reaction, heat is....

a)

Absorbed

b)

Released

17.

In an endothermic reaction, heat is...

a)

Absorbed

b)

Released

18.

What happens in an endothermic reaction?

a)

Moe energy is released

b)

Less energy is released

c)

The substance heats up

d)

The temperature of the substance stays the same

19.

What happens in an exothermic reaction?

a)

More energy is released

b)

Less energy is released

c)

The substance's temperature stays the same

d)

The substance gets colder

20.

What happens in an exothermic reaction?

a)

More energy is released

b)

Less energy is released

c)

The substance's temperature stays the same

d)

The substance gets colder

21.

Once I take an ice pack out of the freezer, is it endothermic or exothermic?

a)

Endothermic

b)

Exothermic

22.

If I put the ice pack back into the freezer, is it endothermic or exothermic?

a)

Endothermic

b)

Exothermic

23.

When cooking eggs, is in endothermic or exothermic?

a)

Endothermic

b)

Exothermic

24.

Is the evaporation of water endothermic or exothermic?

a)

Endothermic

b)

Exothermic

25.

An iron nail getting rusty loses heat. Is the endothermic or exothermic?

a)

Endothermic

b)

Exothermic

26.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
27.
In an endothermic reaction the system is releasing energy.
a)
True
b)
False
28.
Is respiration an Endothermic or an Exothermic reaction?
a)
Endothermic
b)
Exothermic
29.
If they energy required to break the bonds is greater than the energy given out by making new bonds the reaction is
a)
Exothermic
b)
Endothermic
c)
Neutralisation
30.

Endo or exo?

a)

Endo

b)

Exo

31.
Is photosynthesis an exothermic or endothermic reaction?
a)
Endothermic
b)
Exothermic
c)
Neither
32.
A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true? 
a)
The temperature changed 
b)
It is an endothermic reaction
c)
It is an exothermic reaction 
d)
Two of the answers are correct 
33.
After you mix two substances together, a new substance forms.  This is an example of:
 
a)
 Physical Change
b)
 Chemical Change
34.

Which of the following statement is true about the breaking of bonds between molecules?

a)

To break a bond between molecules, energy must be released by the molecule

b)

To break a bond between molecules, no energy is needed.

c)

To break a bond between molecules, energy must be absorbed by the molecule.

35.

Which of the following is true about the formation of bonds between molecules?

a)

Energy is given off when bonds are formed between molecules.

b)

Energy is absorbed by the molecule when bonds are formed.

c)

Energy is neither given off nor absorbed when bonds are formed.

36.

The energy level of molecules will _________ during bond breaking and _________ during bond forming.

a)

decrease, increase

b)

increase, increase

c)

increase, decrease

37.
What is the activation energy?
a)
The energy of the products
b)
The energy of the reactants
c)
The minimum energy needed by the reactants to form the products.
d)
The energy lost in the reaction
38.
Which letter corresponds to the energy of the products?
a)
A
b)
B
c)
C
d)
D
39.
Which letter corresponds to the energy of the reactants?
a)
A
b)
B
c)
C
d)
D
40.

This energy level diagram is showing an ...

a)

endothermic reaction

b)

exothermic reaction

41.

This energy level diagram is showing an ...

a)

Endothermic reaction

b)

Exothermic reaction

42.

What is the label covered by the red box?

a)

Reactant

b)

Activation Energy

c)

Products

d)

Overall energy change

43.

What is the label covered by the blue box?

a)

Reactant

b)

Activation Energy

c)

Products

d)

Overall energy change

44.

What is the label covered by the purple box?

a)

Reactant

b)

Activation Energy

c)

Products

d)

Overall energy change

45.
If ∆H is negative, the reaction is?
a)
exothermic
b)
endothermic
46.
ΔH value in an endothermic reaction is a positive number.
a)
True
b)
False
47.
Which phase of matter has the greatest motion and least orderly arrangement?
a)
solid
b)
liquid
c)
gas
48.

When we investigate the rate of reaction we are looking at the...

a)

amount of product formed

b)

speed of reaction

c)

concentration of reacting particles

d)

combining reactants with products

49.
Which factors increase the rate of a reaction.
a)
increasing temperature
b)
increasing concentration
c)
increasing surface area
d)
all of these
50.
Increase in temperature of the reactants can do one of the following
a)
Slow collision frequency
b)
Allow less effective collision between the particles
c)
Neutralise the reaction
d)
increase collision between the particles thus increasing the rate.
51.
Why does a catalyst increase the rate of reaction?
a)
it produces extra energy for the reactants
b)
it increases the speed of the reactant particles
c)
it increases the frequency of particle collisions
d)
it reduces the activation energy of the reaction 
52.
You add more bodies into a "mosh pit" to hope for more collisions.  You have increased-
a)
temperature
b)
concentration
c)
pressure
d)
catalyst
53.
Which of the following increase the reaction rate?
a)
less surface area
b)
lower temperature
c)
an inhibitor
d)
increased concentration
54.
Why don't all collisions between particles cause a reaction?
a)
the particles also need to collide with a catalyst
b)
not all the particles collide with enough energy
c)
not all the particles collide at a high enough temperature
d)
the particles need to collide with each other twice
55.
Why does a higher temperature increase the rate of a reaction?
a)
it increases both the frequency and energy of particle collisions
b)
it only increases the frequency of particle collisions
c)
it only increases the energy of particle collisions
d)
it reduces the activation energy of the reaction
56.
To slow down a chemical reaction you will do one of the following:
a)
Place the reactants in hot water
b)
Place the products in ice bath
c)
Place the reactants in a ice bath
d)
Keep stirring the reactants with a stirring rod
57.

How could we make this reaction happen more quickly?

a)

Decrease the concentration of the acid

b)

crush the chalk to increase the surface area

c)

Put the test tube in an ice bath

58.

Creating fossils is a very _____ chemical reaction

a)

Fast

b)

Slow

c)

It is not a chemical reaction

59.

What does the M after a concentration value stand for?

a)

meters

b)

music

c)

Molarity

d)

moles

60.

Which is the highest concentration?

a)

10m

b)

2M

c)

25 mmol

d)

0.5M

61.

The major theory of reaction rate is called

a)

Collision theory

b)

Crash theory

c)

Newton's laws

d)

Thermodynamics

62.

When surface area is decreased the rate of reaction...

a)

Decreases, because there are LESS possible sites for correct collisions

b)

Increases, because there are LESS possible sites for correct collisions

c)

Decreases, because there are MORE possible sites for correct collisions

d)

Increases, because there are MORE possible sites for correct collisions

63.

What type of reactions can able to change products back to the their original form?

a)

Reversible reactions

b)

Irreversible reactions

c)

Combustion reactions

d)

Combination reactions

64.

Which of the following changes is irreversible change?

a)

Melting of ice cube

b)

Heating hydrated CuSO4

c)

Frying an egg

d)

Thermal decomposing NH4Cl

65.

Which of the following combination is correct?

a)

reversible ⇌

irreversible →

b)

reversible ←

irreversible →

c)

reversible ⇌

irreversible ←

d)

irreversible ⇌

reversible →

66.

If a reversible reaction is exothermic in the forward direction, it will be ...

a)

exothermic in the reverse direction

b)

endothermic in the forward direction too

c)

endothermic in the reverse direction

d)

not involve energy in reverse direction

67.
Which of these is NOT a reversible change?
a)
Water to Ice
b)
Juice to ice lolly
c)
Cookie Dough to Cookie
d)
Melting Chocolate
68.
A substance that increases speed of chemical reaction without being being changed is called:
a)
Catalyst
b)
Acid
c)
Base
d)
pressure
69.
Increase in temperature of the reactants can do one of the following
a)
Slow collision frequency
b)
Allow less effective collision between the particles
c)
Cause particles to lose speed
d)
Increase collision between the particles thus increasing the rate.
70.

What is the color of the reactant ?

a)

blue

b)

white

71.

What is the color of product ?

a)

blue

b)

white

72.

A temperature increase causes the particles ......

a)

to slow down

b)

move faster

c)

collide higher

d)

in the right order

73.

How does a catalyst work in speeding up a reaction?

a)

By lowering the activation energy or reaction

b)

by giving them more energy

c)

by making them more available

74.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
75.

Why does a higher concentration increase the rate of reaction?

a)

it increases the amount of reactants

b)

it lowers the activation energy

c)

it increases the energy of particle collisions

d)

it increases the frequency of particle collisions

76.

Why does a higher temperature increase the rate of a reaction?

a)

it increases both the frequency and energy of particle collisions

b)

it only increases the frequency of particle collisions

c)

it only increases the energy of particle collisions

d)

it reduces the activation energy of the reaction

77.

The ______________is required to break the bonds of the reactants.

a)

Carbonic energy

b)

Activation energy

c)

Plutonic energy

d)

Energi Gaib

78.
Why don't all collisions between particles cause a reaction?
a)
the particles also need to collide with a catalyst
b)
not all the particles collide with enough energy
c)
not all the particles collide at a high enough temperature
d)
the particles need to collide with each other twice
79.
What is the rate of reaction?
a)
How fast a reaction is 
b)
How big a reaction is
c)
How loud a reaction is
d)
How much gas a reaction produces
80.
Grinding a seltzer tablet into powder increases the rate of reaction due to increased
a)
concentration
b)
surface area
c)
temperature
d)
reactants
81.

What is dynamic equilibrium?

a)

The reaction goes forward

b)

The reaction goes backward

c)

The rate of forward and backward reaction is equal

d)

The equilibrium is dynamite

82.

Which of the following does not affect the position of equilibrium?

a)

Temperature

b)

Pressure

c)

Particle Size

d)

Concentration

83.

How does a catalyst affect the position of the equilibrium?

a)

It does not. It only increases the rate of reaction.

b)

Position of equilibrium will shift to the right.

c)

Position of equilibrium will shift to the left.

d)

The reaction would be slower.

84.

What would be the effect of increasing the temperature to the equilibrium of an exothermic reaction?

a)

equilibrium shifts to the left

b)

equilibrium shifts to the right

c)

no change in position of equilibrium

85.

What would be the effect of increasing the temperature to the equilibrium of an endothermic reaction?

a)

equilibrium shifts to the left

b)

equilibrium shifts to the right

c)

no change in position of equilibrium

86.

What would be the effect of increasing the concentration of the product on the position of the equilibrium?

a)

equilibrium shifts to the left

b)

equilibrium shifts to the right

c)

no change in position of equilibrium

87.

What would be the effect of decreasing the concentration of the reactant on the position of the equilibrium?

a)

equilibrium shifts to the left

b)

equilibrium shifts to the right

c)

no change in position of equilibrium

88.

When pressure is increased, the position of the equilibrium will shift to the side that has...

a)

less number of gaseous molecules

b)

more number of gaseous molecules

89.

3H2 (g) + N2 (g) ⇌ 2NH3 (g) ΔH = −197 kJ/mol

Which of the following factors would shift the equilibrium position to the right? (Choose 2)

a)

increase concentration of nitrogen gas

b)

increase temperature of the equilibrium

c)

increase pressure of the equilibrium

d)

Presence of a catalyst

90.

H2 (g) + I2 (g) ⇌ 2HI (g)

What would be the effect of increasing the pressure on the position of equilibrium?

a)

equilibrium shifts to the right

b)

equilibrium shifts to the left

c)

no change in position of equilibrium

91.
If we increase the pressure, what will happen to the reaction
a)
It will slow down
b)
More ammonia will be produced
c)
Less ammonia will be produced
d)
Nothing will change
92.
Which equation represents the formation of ammonia
a)
N2 + H2 ₋> NH3
b)
N + 3H ₋> NH3
c)
N2 + 3H2 ₋> NH3
d)
N2 + 3H2 ₋> 2NH3
93.
26. Once the Ammonia is separated from the Nitrogen and Hydrogen what is done with the spare Nitrogen and Hydrogen?
a)
a) The Hydrogen is sold as it is an expensive commodity and the Nitrogen is discarded.
b)
b) They are both recycled.
c)
c) The Nitrogen is is sold as it is an expensive commodity and the Hydrogen is discarded.
d)
d) Both are discarded as it is too expensive to separate them.
94.
21. Which statement most accurately describes why a higher pressure is not used in industry for the production of Ammonia?
a)
a) Produces a lower % yield.
b)
b) Expensive and dangerous
c)
c) Structural integrity of any reaction vessel would be compromised
d)
d) The rate of reaction would be too fast
95.
22. Explain why only a moderately high temperature is used in industry for the production of Ammonia.
a)
a) Produces a lower % yield but at a faster rate
b)
b) Produces a higher % yield but at a faster rate
c)
c) Produces a lower % yield but at a slower rate
d)
d) Produces a higher % yield but at a slower rate
96.

Ammonia can be used to make the following

a)

Fertiliser

b)

Plastics

c)

iPhones

d)

Explosives!

97.

What are the usual conditions of the Haber Process

a)

450'C, 550 atm, Iron Catalyst

b)

100'C, 200 atm, Diamond Catalyst

c)

450'C, 250 atm, Iron Catalyst

d)

-450'C, 250 atm, Iron Catalyst

98.
How do catalysts increase the rate of reaction?
a)
The frequency of collisions is the increased
b)
the activation energy is lowered
c)
the energy of collisions is increased
d)
Both the frequency and energy of collisions is increased
99.
At what time (in seconds) is equilibrium established?
a)
0 seconds
b)
1 second
c)
5 seconds
d)
10 seconds
100.
Identify the labels (a) and (b) on the graph.
a)
a is concentration of reactants and b is the concentration of product
b)
a is concentration of product and b is the concentration of reactant
c)
a is the volume of reactants and b is the volume of product
d)
a the mass of reactants and b is the mass of product
101.
At what time the reaction reached equilibrium?
a)
t1
b)
t2
c)
t3
d)
t4
102.

What is a closed system

a)

It gives out energy

b)

The reactants and the products do not escape from reaction mixture

c)

It takes in energy

d)

The reactants and the products escape from he reaction mixture to be kept in the system

103.

Heating aqueous Copper sulfate gives

a)

Black powder

b)

Orange juice

c)

White powder

d)

Blue powder

104.

What is the symbol which is used in reversible reactions?

a)

→

b)

Δ

c)

+

d)

⇌

105.
In an endothermic reaction the products have 
a)
more energy than the reactants
b)
less energy than the reactants
c)
the same energy as the reactants
d)
no energy
106.
In an exothermic reaction the products have
a)
more energy than the reactants
b)
the same energy as the reactants
c)
less energy than the reactants
d)
no energy
107.

When no reactants can be detected, you can say that the reaction has gone to completion, or is irreversible.

a)

True

b)

False

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