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Collision Theory & Reaction Rates 2526

Total questions: 97

Worksheet time: 2hrs 37mins

Name
Class
Date
1.

What criteria must be met for reactant collisions to result in a successful product?

a)

The reactants must collide with each other

b)

The reactants must collide with enough energy and be in the right positions

c)

The reactants must have enough energy to form the activated complex

2.
More collisions correspond to a: 
a)
Faster reaction rate  
b)
Slower reaction rate
c)
Constant reaction rate 
d)
None of the above
3.
Which of the following is/are the fundamental idea(s) of collision theory?
a)
Molecules react by colliding together
b)
The effective collisions must occur with certain minimum amounts of energy 
c)
In a large sample, the greater the number of effective collisions, and the faster the rate of reaction
d)
All of the above
4.
Which factors increase the rate of a reaction.
a)
increasing temperature
b)
increasing concentration
c)
increasing surface area
d)
all of these
5.
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.
6.
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
7.

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

8.

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

9.

Which has more surface area?

a)

Large chunks of chalk

b)

Cube of sugar

c)

Powdered sugar

d)

Small chunks of sugar

10.

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

a)

to slow down

b)

move faster

c)

collide higher

d)

in the right order

11.

How does a catalyst work in speeding up a reaction?

a)

By lowering the activation energy of reaction

b)

by giving them more energy

c)

by making them more available

12.
Which of the following is NOT a factor affecting reaction rate?
a)
temperature
b)
catalysts
c)
particle size
d)
polarity
13.
Which of the following is NOT a factor affecting reaction rate?
a)
temperature
b)
catalysts
c)
particle size
d)
polarity
14.

What is the rate of reaction?

a)

How much energy is needed for a reaction to occur.

b)

The energy required to break a bond.

c)

The time it takes for a reaction to occur.

d)

Collision Theory

15.

Which of the following increase the reaction rate?

a)

less surface area

b)

lower temperature

c)

increased concentration

16.

Suppose you held a lighted match to a solid hunk of wood and another match to a pile of wood shavings. Which form of wood will catch fire more easily?

a)

Wood shavings because of larger surface area.

b)

Wood chunk because of smaller surface area

c)

Wood chunk because of larger surface area.

d)

Wood shavings because of smaller surface area.

17.

What is the rate of reaction?

a)

The time it takes for a reaction to occur.

b)

How much energy is needed for a reaction to occur.

c)

The energy required to break a bond.

d)

Collision Theory

18.

What factors affect rate of reaction?

a)

Temperature, Pressure, Concentration and Surface area

b)

Temperature, Concentration, Pressure and Energy

c)

Surface Area, Concentration, Energy and Pressure

d)

Pressure, Surface area, Density and Energy

19.

The minimum amount of energy that reacting (colliding) particles need to react is called_________ _________.

a)

activation energy

b)

colliding energy

c)

kinetic energy

d)

maximum energy

20.

As a reaction proceeds, the concentration of reactants will _______ and the concentration of products will ________.

a)

decrease, increase

b)

increase, decrease

c)

increase, increase

d)

decrease, decrease

21.

A reactants temperature is increased. What happens?

a)

more collisions occur

b)

the same number of collisions occur

c)

greater collision energy

d)

less collision energy

e)

the same collision energy

22.

A reactants concentration is increased. What happens?

a)

more collisions occur

b)

the same number of collisions occur

c)

greater collision energy

d)

less collision energy

e)

the same collision energy

23.

What happens to reaction rate when temperature is decreased?

a)

it increases

b)

it decreases

c)

it stays the same.

24.

The higher the temperature a substance has the

a)

more energy it has

b)

less energy it has

25.

A log is burning in a campfire. If the concentration of oxygen reaching the log is increased, what will happen to the reaction rate?

a)

reaction rate decreases

b)

reaction rate increases

c)

reaction rate remains the same

26.

What happens to reaction rate when a reactants concentration is increased?

a)

it increases

b)

it decreases

c)

it remains the same

27.

A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.

a)

catalyst

b)

products

c)

reactants

d)

chemical reaction

28.

The minimum quantity of energy which the reacting species must possess in order to undergo a specific reaction.

a)

collision theory

b)

activation energy

c)

reaction rate

d)

chemical reaction

29.

Which PE Diagram represents an endothermic reaction?

a)

A

b)

B

30.

Which PE Diagram represents an exothermic reaction?

a)

A

b)

B

31.

What is the purpose of a catalyst?

a)

Helps to slow down a reaction

b)

Raises the activation energy

c)

Lowers the activation energy

d)

Is consumed by the reaction

32.

Increasing the temperature of your solution will.......

a)

Not affect the rate of reaction.

b)

Speed up the rate of reaction

c)

Slow down the rate of reaction

33.

Decreasing the concentration of a substance will usually........

a)

Slow down the reaction

b)

Speed up the reaction

c)

Have no affect on the reaction

34.

If you shrink the container size that your gas substance is in what will happen?

a)

The reaction rate will stay the same

b)

The reaction rate will speed up

c)

The reaction rate will slow down

35.
With the increase in temperature, the average kinetic energy of the molecules increases, leading to a decrease in number of collisions per unit time.
a)
True
b)
False
36.

What instrument would you use to detect an endothermic or exothermic reaction?

a)

triple beam balance

b)

ruler

c)

thermometer

37.

Exo means out or ________.

a)

absorbed

b)

released

38.

Endo means in or _______.

a)

absorbed

b)

released

39.
What happens to particles as they heat up?
a)
They slow down
b)
Nothing
c)
They don't move
d)
They speed up
40.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
41.

As the frequency of ______________ increases, the rate of reaction increases.

a)

Time

b)

Reactions

c)

Collisions

d)

Reactants

42.

Increasing the temperature gives particles more __________.

a)

Time

b)

Energy

c)

Space

d)

Frequency

43.

Grinding a effervescent tablet into powder increases the rate of reaction due to increased

a)

concentration

b)

surface area

c)

temperature

d)

reactants

44.
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
45.

Suppose you held a lighted match to a solid hunk of wood and another match to a pile of wood shavings. Which form of wood will catch fire more easily?

a)

Wood shavings because of larger surface area.

b)

Wood chunk because of smaller surface area

c)

Wood chunk because of larger surface area.

d)

Wood shavings because of smaller surface area.

46.

What is collision theory?

a)

Molecules must collide in the correct orientation with enough energy to bond.

b)

Molecules need enough energy to collide and react.

c)

Atoms constantly collide and react.

d)

The minimum energy needed for atoms to react

47.

What is the rate of reaction?

a)

The time it takes for a reaction to occur.

b)

How much energy is needed for a reaction to occur.

c)

The energy required to break a bond.

d)

Collision Theory

48.

What factors affect rate of reaction?

a)

Temperature, Pressure, Concentration and Surface area

b)

Temperature, Concentration, Pressure and Energy

c)

Surface Area, Concentration, Energy and Pressure

d)

Pressure, Surface area, Density and Energy

49.

The minimum amount of energy that reacting (colliding) particles need to react is called_________ _________.

a)

activation energy

b)

colliding energy

c)

kinetic energy

d)

maximum energy

50.

As a reaction proceeds, the concentration of reactants will _______ and the concentration of products will ________.

a)

decrease, increase

b)

increase, decrease

c)

increase, increase

d)

decrease, decrease

51.

A reactants temperature is increased. What happens?

a)

more collisions occur

b)

the same number of collisions occur

c)

greater collision energy

d)

less collision energy

e)

the same collision energy

52.

A reactants concentration is increased. What happens?

a)

more collisions occur

b)

the same number of collisions occur

c)

greater collision energy

d)

less collision energy

e)

the same collision energy

53.

What happens to reaction rate when temperature is decreased?

a)

it increases

b)

it decreases

c)

it stays the same.

54.

The higher the temperature a substance has the

a)

more energy it has

b)

less energy it has

55.

How does a catalyst work in speeding up a reaction?

a)

By lowering the activation energy of reaction

b)

by giving them more energy

c)

by making them more available

56.

A log is burning in a campfire. If the concentration of oxygen reaching the log is increased, what will happen to the reaction rate?

a)

reaction rate decreases

b)

reaction rate increases

c)

reaction rate remains the same

57.

What happens to reaction rate when a reactants concentration is increased?

a)

it increases

b)

it decreases

c)

it remains the same

58.

A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.

a)

catalyst

b)

products

c)

reactants

d)

chemical reaction

59.

The minimum quantity of energy which the reacting species must possess in order to undergo a specific reaction.

a)

collision theory

b)

activation energy

c)

reaction rate

d)

chemical reaction

60.

What criteria must be met for reactant collisions to result in a successful product?

a)

The reactants must collide with each other

b)

The reactants must collide with enough energy and be in the right positions

c)

The reactants must have enough energy to form the activated complex

61.
The collisions which bring about a chemical reaction are called: 
a)
Consistent collisions
b)
 Normal collisions 
c)
Effective collisions 
d)
None of the above
62.
More collisions correspond to a: 
a)
Faster reaction rate  
b)
Slower reaction rate
c)
Constant reaction rate 
d)
None of the above
63.
Which of the following is/are the fundamental idea(s) of collision theory?
a)
Molecules react by colliding together
b)
The effective collisions must occur with certain minimum amounts of energy 
c)
In a large sample, the greater the number of effective collisions, and the faster the rate of reaction
d)
All of the above
64.
Which factors increase the rate of a reaction.
a)
increasing temperature
b)
increasing concentration
c)
increasing surface area
d)
all of these
65.
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.
66.
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
67.

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

68.

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

69.

Which has more surface area?

a)

Large chunks of chalk

b)

Cube of sugar

c)

Powdered sugar

d)

Small chunks of sugar

70.

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

a)

to slow down

b)

move faster

c)

collide higher

d)

in the right order

71.

How does a catalyst work in speeding up a reaction?

a)

By lowering the activation energy of reaction

b)

by giving them more energy

c)

by making them more available

72.
Which of the following is NOT a factor affecting reaction rate?
a)
temperature
b)
catalysts
c)
particle size
d)
polarity
73.

What is the rate of reaction?

a)

How much energy is needed for a reaction to occur.

b)

The energy required to break a bond.

c)

The time it takes for a reaction to occur.

d)

Collision Theory

74.

Which of the following increase the reaction rate?

a)

less surface area

b)

lower temperature

c)

increased concentration

75.

As a reaction proceeds, the concentration of reactants will _______ and the concentration of products will ________.

a)

increase, decrease

b)

increase, increase

c)

decrease, decrease

d)

decrease, increase

76.
The collision theory qualitatively explains how chemical reactions occur and why reaction rates differ for different reactions
a)
True
b)
False
77.
Collisions may take place between: 
a)
Atoms
b)
Ions
c)
Molecules
d)
All of the above
78.
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 
79.
Which of the following increase the reaction rate?
a)
less surface area
b)
lower temperature
c)
an inhibitor
d)
increased concentration
80.
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
81.
Smaller particle size allows for a _________ surface area to be exposed for the reaction.
a)
larger
b)
smaller
82.
If the reactant particles collide with less than the activation energy, the particles will be rebound, and no reaction will occur.
a)
True
b)
False
83.

What effect does chopping vegetables have on their cooking time and why? (using principles of collision theory)

a)

Chopped vegetables are at a higher temperature and therefore take less time to cook

b)

Chopped vegetables have catalysts and therefore take less time to cook

c)

Chopped vegetables have increased surface area and therefore take less time to cook

d)

Chopped vegetables are more concentrated and therefore take more time to cook

84.
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
85.

Which has more surface area?

a)

Large chunks of chalk

b)

Cube of sugar

c)

Powdered sugar

d)

Small chunks of sugar

86.

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

a)

to slow down

b)

move faster

c)

collide higher

d)

in the right order

87.
Which of the following is NOT a factor affecting reaction rate?
a)
temperature
b)
catalysts
c)
particle size
d)
polarity
88.
The rate of a chemical reaction is NOT affected by which of the following:
a)
temperature
b)
concentration
c)
particle size (surface area)
d)
All of these affect reaction rates
89.
Products will form faster if____________
a)
the particle size of the reactants are larger.
b)
temperature is decreased.
c)
concentration of the reactants are increased.
d)
the reaction is not stirred.
90.
A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 
a)
catalyst
b)
product
c)
reactant
d)
solute
91.

Catalysts permit reactions to proceed along a ___________energy path.

a)

lower

b)

higher

c)

magnetic

d)

psycho's

92.

Smaller particle size allows for a _________ surface area to be exposed for the reaction.

a)

larger

b)

smaller

c)

rectangular

d)

spherical

93.

Increasing the ____ causes the particles (atoms

or molecules) of the reactants to move more quickly so that

they collide with each other more frequently and with more

energy.

a)

Catalyst

b)

Surface Area

c)

Temperature

d)

Concentration

94.

________ is the measure of how much area of an

object is exposed.

a)

Surface Area

b)

Catalyst

c)

Temperature

d)

Concentration

95.

Grains of sugar have a greater _______ than a solid cube of

sugar of the same mass, and therefore will dissolve quicker in water.

a)

Surface Area

b)

Catalyst

c)

Temperature

d)

Concentratrion

96.

Pick the TWO (2) options that will INCREASE the rate of a reaction.

a)

Reducing Heat

b)

Adding Catalyst

c)

Adding Heat

d)

Removing Catalyst

97.

Which of the following will lower the rate

of reaction?

a)

adding an enzyme to the reaction

b)

decreasing the temperature from 40°C to

10°C

c)

breaking a chunk of calcium up into

smaller pieces

d)

increasing the amount of solute

dissolved in a solution

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