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Modifying Factors for Chemical Rates of Reaction

Total questions: 73

Worksheet time: 52mins

Name
Class
Date
1.

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

2.
Which factors increase the rate of a reaction.
a)
increasing temperature
b)
increasing concentration
c)
increasing surface area
d)
all of these
3.
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.
4.
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 
5.
You add more bodies into a "mosh pit" to hope for more collisions.  You have increased-
a)
temperature
b)
concentration
c)
pressure
d)
catalyst
6.
Which of the following increase the reaction rate?
a)
less surface area
b)
lower temperature
c)
an inhibitor
d)
increased concentration
7.
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
8.
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
9.
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
10.

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

11.

Creating fossils is a very _____ chemical reaction

a)

Fast

b)

Slow

c)

It is not a chemical reaction

12.

What does the M after a concentration value stand for?

a)

meters

b)

music

c)

Molarity

d)

moles

13.

Which is the highest concentration?

a)

10m

b)

2M

c)

25 mmol

d)

0.5M

14.

The major theory of reaction rate is called

a)

Collision theory

b)

Crash theory

c)

Newton's laws

d)

Thermodynamics

15.

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

16.

You know that a chemical reaction is occurring here because you see __________________ . (Pick 3)

a)

purple color

b)

smoke

c)

ice formation

d)

fire

e)

a yellow precipitate

17.

In this chemical reaction, what was the first evidence that you saw?

a)

Production of fire

b)

Production of light

c)

Production of purple smoke

d)

Production of white powder

18.

The result of the experiment between Iodine and Aluminum was the production of __________________.

a)

clear liquid.

b)

a white powder.

c)

yellow precipitate.

d)

bubbles.

19.

When zinc reacted with hydrochloric acid, what was the result of this reaction?

a)

a white powder

b)

a blue liquid

c)

a brown precipitate

d)

a gas

20.

We know that there was a chemical reaction occurring when 2 clear liquids were mixed together. That is because we show the production of a _____________.

a)

solid.

b)

precipitate.

c)

gas.

21.

A precipitate is a ___________ that forms when 2 liquids react together.

a)

solid

b)

liquid

c)

gas

d)

plasma

22.

Reactants are the chemicals that are present at the beginning of an experiment. Reactants react together to make the product.

We can know that a chemical reaction is occurring when we see ______.

a)

that the product looks just like the reactants.

b)

nothing new.

c)

that the product looks different from the reactants.

23.

Which of the following is evidence of a chemical reaction?

a)

Tearing paper.

b)

Change in color.

c)

Production of a gas.

d)

Change in temperature.

e)

Production of a precipitate.

24.

List four factors that affects the rate of a reaction

a)

temperature

b)

concentration

c)

surface area

d)

volume

e)

catalysts

25.

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

a)

to slow down

b)

move faster

c)

collide higher

d)

in the right order

26.

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

27.
The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?
a)
Red, because the activation energy is larger
b)
Blue, because the activation energy is lower
c)
both reaction progress at the same rate
28.
What does NOT happen when the temperature is increased?
a)
Particles collide more often
b)
Particles collide with more energy
c)
Particles move faster
d)
More particles collide in the correct orientation
29.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
30.

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

31.

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

32.

The ______________is required to break the bonds of the reactants.

a)

Carbonic energy

b)

Activation energy

c)

Plutonic energy

d)

Energi Gaib

33.
What makes an effective collision?
a)
When molecules collide.
b)
When molecules collide with the proper orientation.
c)
When molecules collide with proper orientation and enough kinetic energy.
d)
High Temperature.
34.
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
35.
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
36.
Located on the left side of the reaction
a)
reactants
b)
products
37.

The minimum amount of energy needed for colliding particles to react is called

a)

Chemical Energy

b)

Kinetic Energy

c)

Activation Energy

d)

Potential Energy

38.
Grinding a seltzer tablet into powder increases the rate of reaction due to increased
a)
concentration
b)
surface area
c)
temperature
d)
reactants
39.

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

a)

to slow down

b)

move faster

c)

collide higher

d)

in the right order

40.

Adding a catalyst ___________ the activation energy.

a)

Raises

b)

Lowers

c)

Doesn't affect

d)

Inreases

41.

Which graph shows the effect of increasing temperature on the rate of reaction of calcium carbonate with dilute hydrochloric acid?

a)
b)
c)
d)
42.
The graph shows how the total volume of a gas given off from a reaction changes with time. In which time interval is least gas given off? 
a)
A
b)
B
c)
C
d)
D
43.
In an experiment, a 2 g lump of zinc and 2 g of powdered zinc are added separately to equal volumes of dilute sulphuric acid. The solid line on the graph shows the volume of gas given off when the 2 g lump is used. Which dotted line is obtained when the zinc is powdered? 
a)
A
b)
B
c)
C
d)
D
44.
A student investigated the rate of reaction of calcium carbonate with dilute hydrochloric acid. Every minute, the student recorded the total volume of carbon dioxide produced, until some time after the reaction was complete.
Which graph shows the correct results? 
a)
A
b)
B
c)
C
d)
D
45.
Order the letters from highest to lowest rate of reaction.
a)
A > B > C > D
b)
A > BC > D (B and C have the same rate)
c)
A > B > CD (C and D have the same rate)
d)
D > C > B > A
46.
Which letter corresponds to the activation energy of the forward reaction?
a)
A
b)
B
c)
C
d)
D
47.

Which factors affect the rate of a reaction?

a)

temperature

b)

concentration

c)

surface area

d)

pressure

e)

catalyst

48.

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

49.

The minimum amount of energy needed for colliding particles to react is called the

a)

Chemical Energy

b)

Kinetic Energy

c)

Activation Energy

d)

Potential Energy

50.

A substance that increases the rate of a reaction without being used up during the reaction is called a

a)

catalyst

b)

product

c)

reactant

d)

solute

51.
Catalysts permit reactions to proceed along a ___________energy path.
a)
lower
b)
higher
52.
A catalyst increases the efficiency of collisions between reactants.
a)
true
b)
false
53.

What is the name given to a catalyst in the human body?

a)

Biology

b)

Catalyst

c)

Chemical

d)

Enzyme

54.

Which of the reaction pathway shows the catalysed reaction?

a)

1

b)

2

55.

When a catalyst is added to a reaction the rate of reaction,,,

a)

Increases

b)

Decreases

c)

Does not change

56.

How does a catalyst work in speeding up a reaction?

a)

By lowering the activation energy or reaction

b)

by making them more available

c)

by giving them more energy

57.

A catalyst

a)

is used up

b)

is nevr used up

58.

A catalyst be regenerated or used again and again

a)

False

b)

True

59.

A catalyst changes the mechanism of the reaction

a)

True

b)

False

60.

Catalysts may be in the state of ___________.

a)

Solid and liquid only

b)

Liquid and gases only

c)

Solid and gases only

d)

Solid, liquid or gases

61.

The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?

a)

Red, because the activation energy is larger

b)

Blue, because the activation energy is lower

c)

both reaction progress at the same rate

62.

Enzymes in your body probably work best at which of the following temperatures>

a)

25oC

b)

37oC

c)

98oC

d)

100oC

63.

What is activation energy?

a)

energy to get up in the morning

b)

energy to boil a kettle

c)

minimum energy required for a reaction to occur

d)

maximum energy needed for a reaction to occur

e)

the number of particles in a reaction

64.

What does increasing the temperature do?

a)

breaks the reactants up in to smaller pieces

b)

increase amount of product

c)

increase energy of particles

d)

increase the number of particles

e)

slower the particles down

65.

What does increasing the surface area do?

a)

breaks the reactants up in to smaller pieces

b)

increase amount of product

c)

increase energy of particles

d)

increase the number of particles

e)

slower the particles down

66.

What does increasing the concentration do?

a)

breaks the reactants up in to smaller pieces

b)

increase amount of product

c)

increase energy of particles

d)

increase the number of particles

e)

slower the particles down

67.
With what 3 letters do enzymes typically end?
a)
-ose
b)
-ase
c)
-ese
d)
-tic
68.
Enzymes are...
a)
nucleic acids
b)
proteins
c)
lipids
d)
carbohydrates
69.
An enzyme speeds up a chemical reaction in the cell but can only be used once.  True or False? 
a)
true
b)
false
70.
What is another name for enzymes?
a)
chemical catalysts
b)
microorganisms
c)
biological catalysts
d)
inorganic catalysts
71.

Enzymes are found in

a)

our cells

b)

animals

c)

plants

d)

all of the options are correct

72.

There are many different types of enzymes.

a)

True

b)

False

73.

If the temperature of the environment is not correct the enzyme may not work.

a)

True

b)

False

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