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PhySci quiz 4 Collision Theory and the Factors

Total questions: 60

Worksheet time: 55mins

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.
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.
5.
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
6.

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

7.

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

8.

Which has more surface area?

a)

Large chunks of chalk

b)

Cube of sugar

c)

Powdered sugar

d)

Small chunks of sugar

9.

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

a)

to slow down

b)

move faster

c)

collide higher

d)

in the right order

10.

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

11.
Which of the following is NOT a factor affecting reaction rate?
a)
temperature
b)
catalysts
c)
particle size
d)
polarity
12.

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

13.

Which of the following increase the reaction rate?

a)

less surface area

b)

lower temperature

c)

increased concentration

14.
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
15.
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.
16.

Which is CORRECT about temperature as one of the factors affecting rate of chemical reaction?

a)

The higher the temperature is, the slower will be the rate of reaction.

b)

The higher the temperature is, the faster will be the rate of reaction.

c)

The lower the temperature is, the faster will be the rate of reaction.

d)

The lower the temperature is, the slower will be the rate of reaction.

17.

Activation energy is also known as _____________________.


Note: If a reaction has a low activation energy then the reaction will be fast as a lot of particles will have the required energy.

a)

free energy

b)

energy barrier

c)

internal energy

d)

reaction energy

18.

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

d)

By producing more products

19.

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

20.

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

21.

Decreasing concentration has which of the following effects on reaction rate?

a)

Increases reaction rate.

b)

Has no effect on reaction rate.

c)

Decreases reaction rate.

22.
Grinding a seltzer tablet into powder increases the rate of reaction due to...
a)
increased concentration of reactants
b)
increased surface area
c)
increased speed of particles.
d)
better orientation of reactants
23.
Which factors increase the rate of a reaction.
a)
increasing temperature
b)
increasing concentration
c)
increasing surface area
d)
All of these
24.

The glow stick glowed brighter in hot water because

a)

the chemical reaction slowed down in hot water

b)

the chemical reaction speed up in hot water

c)

temperature has no effect on the glow stick chemical reaction

d)

all of the above

25.
The rate of a reaction increases as temperature__________________.
a)
Decreases
b)
Increases
c)
Stays the Same
26.
Catalysts permit reactions to proceed along a ___________energy path.
a)
lower
b)
higher
27.
A catalyst works by
a)
changing the order of the reaction
b)
increasing the temperature
c)
lowering the activation energy
d)
making the activated complex
28.

How does a catalyst increase the rate of a chemical reaction?

a)

Provides lower energy route for the reaction so that a greater number of particles have enough energy to react.

b)

Increased number of collisions increases the chance of a 'successful collision'

c)

Particles collide faster and harder so a larger proportion have greater energy than the required activation energy.

29.

How does temperature increase the rate of a chemical reaction?

a)

Provides lower energy route for the reaction so that a greater number of particles have enough energy to react.

b)

Increased number of collisions increases the chance of a 'successful collision'

c)

Particles collide faster and harder so a larger proportion have greater energy than the required activation energy.

d)

Greater number of 'active sites' available for a reaction to take place (referring to solids)

30.

How does concentration increase the rate of a chemical reaction?

a)

Provides lower energy route for the reaction so that a greater number of particles have enough energy to react.

b)

Increased number of collisions increases the chance of a 'successful collision'

c)

Particles collide faster and harder so a lagrer proportion have greater energy than the required activation energy.

d)

Greater number of 'active sites' available for a reaction to take place (referring to solids)

31.
Increasing the concentration of the reactants will slow down the reaction.
a)
false 
b)
true
32.
Usually lowering the temperature will slow down a reaction.
a)
false
b)
true
33.
Increasing the temperature will increase the kinetic energy of particles, therefore increasing the collisions between particles.
a)
false
b)
true
34.

The ____________ states that atoms, ions, or molecules must collide in order to react.

a)

transition state

b)

activation energy

c)

rate law

d)

collision theory

35.

Which of the following statement is correct?

a)

Smaller size of reactants, smaller total surface area, higher reaction rate

b)

Larger size of reactants, smaller total surface area, higher reaction rate

c)

Smaller size of reactants, larger total surface area, higher reaction rate

d)

Larger size of reactants, larger total surface area, higher reaction rate

36.

____________ temperature can ___________ the rate of reaction.

a)

Higher; increase

b)

Lower; increase

c)

Moderate; increase

37.

What factors effect rate of reaction?

a)

Temperature, Concentration, Pressure and Energy

b)

Surface Area, Concentration, Energy and Pressure

c)

Temperature, Pressure, Concentration and Surface area

d)

Pressure, Surface area, Density and Energy

38.

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

39.
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
40.
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
41.
In a chemical reaction, collisions between the molecules provide the potential energy needed to break the bond.
a)
True
b)
False
42.
The collision theory qualitatively explains how chemical reactions occur and why reaction rates differ for different reactions
a)
True
b)
False
43.

The measure of the change in the concentration of the reactants or products.

a)

Activation Energy

b)

Activation Rate

c)

Chemical Reaction

d)

Concentration

44.

The substance or particles that enter into and are altered in the course of a chemical reaction.

a)

Catalyst

b)

Enzyme

c)

Product

d)

Reactant

45.

The measure of how fast or slow a reaction happens.

a)

Activation Energy

b)

Collision theory

c)

Particle Size

d)

Rate of Reaction

46.

The substance formed as a result of a chemical reaction.

a)

Product

b)

Reactant

c)

Resistance

d)

Substrate

47.
Have you ever eaten sherbet sweets candy? They fizz in your mouth and your tongue feels cold. Why do you think that is?
a)
It is an exothermic reaction
b)
It is an endothermic reaction
c)
It is made of ice
d)
It is dissolving your mouth
48.

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

49.
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
50.
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
51.
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
52.
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
53.

Which 2 trials show the effect of temperature change on reaction rate, and what is the effect of increasing temperature?

a)

1 and 6; rate increases as temperature increases

b)

2 and 6; rate decreases as temperature increases

c)

3 and 6; rate increases as temperature increases

d)

4 and 6; rate decreases as temperature increases

54.

Which 2 trials show the effect of a catalyst on reaction rate, and what is the effect of adding a catalyst?

a)

1 and 5; rate increases when a catalyst is added

b)

2 and 5; rate decreases when a catalyst is added

c)

3 and 5; rate increases when a catalyst is added

d)

4 and 5; rate decreases when a catalyst is added

55.

A form of matter that has definite composition and distinct characteristics.

a)

Atoms

b)

Compound

c)

Mixture

d)

Substance

56.

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

57.
You add more bodies into a "mosh pit" to hope for more collisions.  You have increased-
a)
temperature
b)
concentration
c)
pressure
d)
catalyst
58.

Which of the following statement is correct?

a)

Smaller size of reactants, smaller total surface area, higher reaction rate

b)

Larger size of reactants, smaller total surface area, higher reaction rate

c)

Smaller size of reactants, larger total surface area, higher reaction rate

d)

Larger size of reactants, larger total surface area, higher reaction rate

59.
Usually lowering the temperature will slow down a reaction.
a)
false
b)
true
60.
Increasing the concentration of the reactants will slow down the reaction.
a)
false 
b)
true

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