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Reaction Profiles

Total questions: 64

Worksheet time: 36mins

Name
Class
Date
1.

The minimum energy particles must have to react is the

a)

acting energy

b)

active energy

c)

activation energy

2.

A reaction profile shows....

a)

the relative difference in temperature of reactants and products

b)

the relative difference in amounts of reactants and products

c)

the relative difference in energy of reactants and products

d)

the relative difference in volume of reactants and products

3.

Bond making is

a)

Endothermic

b)

Exothermic

4.

Bond breaking is..

a)

Endothermic

b)

Exothermic

5.

Which letter shows the activation energy

a)

A

b)

B

c)

C

6.

In a reaction the energy required to break bonds is less than the energy released when bonds are made. What type of reaction is this?

a)

Exothermic

b)

Endothermic

7.

Is this showing an endothermic or an exothermic reaction?

a)

Endothermic

b)

Exothermic

8.

Which letter shows the heat change?

a)

A

b)

B

c)

C

d)

D

e)

E

9.

Which letter represents the reactants?

a)

A

b)

B

c)

C

d)

D

e)

E

10.

Which letter represents the products?

a)

A

b)

B

c)

C

d)

D

e)

E

11.

Which letter represents the transition state?

a)

A

b)

B

c)

C

d)

D

e)

E

12.
In an endothermic reaction the system is releasing energy.
a)
True
b)
False
13.
During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______. 
a)
Warm
b)
Cold
14.
Baking bread and cooking an egg are examples of....?
a)
Endothermic processes
b)
Exothermic processess
c)
None of these 
15.
Is photosenthysis an Exothermic or an Endothermic reaction?
a)
Endothermic
b)
Exothermic
16.

What type of reaction occurs in a hand warmer?

a)

exothermic

b)

endothermic

17.

Which of the following process is exothermic?

a)

Candle was melting

b)

A puddle evaporating

c)

Dry ice (solid carbon dioxide) subliming to form gaseous carbon dioxide

d)

Water freezing to form ice

18.
ΔH value in an endothermic reaction is a positive number.
a)
True
b)
False
19.
Define 'Enthalpy'
a)
a) Energy stored in the movement of molecules in a substance
b)
b) The opposite of temperature
c)
c) The temperature of a molecule
d)
d) Energy stored in the chemical bonds in a substance
20.

What is the Heat of Reaction ΔH\Delta H  for this reaction?

a)

-200 KJ

b)

200 KJ

c)

400 KJ

d)

-300 KJ

21.

Chemical reactions occur when reacting particles....

a)

collide

b)

pass

c)

interact

d)

are mixed

22.

The minimum energy particles must have to react is the

a)

acting energy

b)

active energy

c)

activation energy

23.

A reaction profile shows....

a)

the relative difference in temperature of reactants and products

b)

the relative difference in amounts of reactants and products

c)

the relative difference in energy of reactants and products

d)

the relative difference in volume of reactants and products

24.

Bond making is

a)

Endothermic

b)

Exothermic

25.

Bond breaking is..

a)

Endothermic

b)

Exothermic

26.

Which letter shows the activation energy

a)

A

b)

B

c)

C

27.

What is the definition of activation energy? Two answers are required.

a)

The energy needed to start a reaction

b)

The temperature needed to start a reaction

c)

The minimum energy that particles must have to react

d)

The maximum energy that particles must have to react.

28.

In a reaction the energy required to break bonds is less than the energy released when bonds are made. What type of reaction is this?

a)

Exothermic

b)

Endothermic

29.

Does this show an endothermic or an exothermic reaction?

a)

Endothermic

b)

Exothermic

30.

In an endothermic reaction...

a)

heat is released

b)

heat is absorbed

31.

In an exothermic reaction...

a)

heat is released

b)

heat is absorbed

32.

Is this showing an endothermic or an exothermic reaction?

a)

Endothermic

b)

Exothermic

33.

Collisions that result in the formation of products are called (a)   collisions

34.

Increasing the temperature in a reaction lowers the activation energy.

a)

True

b)

False

35.

Increasing the temperature increases the number of collisions and therefore the number of effective collisions.

a)

True

b)

False

36.

Increasing the concentration increases the number of collisions and therefore the number of effective collisions.

a)

True

b)

False

37.

Catalysts increase the reaction rate by lowering the activation energy

a)

True

b)

False

38.

For which reaction is the activation energy higher?

a)

With the catalyst

b)

Without the catalyst

39.

Which letter shows the activation energy?

a)

A

b)

B

c)

C

d)

D

e)

E

40.

Which letter shows the heat change?

a)

A

b)

B

c)

C

d)

D

e)

E

41.

Which letter represents the reactants?

a)

A

b)

B

c)

C

d)

D

e)

E

42.

Which letter represents the products?

a)

A

b)

B

c)

C

d)

D

e)

E

43.

Which letter represents the transition state?

a)

A

b)

B

c)

C

d)

D

e)

E

44.

In an endothermic reaction...

a)

products have more energy than reactants

b)

reactants have more energy than products

45.

What happens to the rate of a reaction when you decrease the temperature?

a)

decreases

b)

increases

c)

stays the same

46.

Which of the following changes will NOT increase the rate of a chemical reaction?

a)

increase temperature

b)

increase surface area

c)

increase concentration

d)

decrease concentration

47.

Which of the following statements best explains how a catalyst works?

a)

lowers the activation energy for the reaction

b)

provides an alternative route with a lower activation energy

c)

provides an alternative route

d)

speeds up the reaction without being used up

48.

What change could you make to a solid reactant to increase the rate of a reaction?

a)

increase the concentration

b)

increase the pressure

c)

increase the surface area

49.

Is the following statement true or false:

Adding manganese(IV) oxide increases the rate of a reaction

a)

true

b)

false

50.

What is the formula of hydrogen peroxide?

a)

H2O2

b)

2H2O2

c)

H2O

d)

HO2

51.

What is a catalyst?

a)

A very fast moggie

b)

A substance that increases the rate of a reaction and is used up

c)

A substance that increases the rate of a reaction but is not used up

d)

A substance that decreases the rate of a reaction and is not used up

52.

What will you observe when calcium carbonate reacts with hydrochloric acid?

a)

Effervescence and it turns white

b)

Effervescence and the calcium carbonate gets smaller

c)

A lilac flame

d)

The grey solid disappears

53.

What is produced during the reaction between hydrochloric acid and marble chips?

a)

oxygen gas and calcium chloride

b)

oxygen gas and calcium carbonate

c)

calcium chloride, carbon dioxide and water

d)

water, carbon dioxide and calcium carbonate

54.

What has to happen for a chemical reaction to occur?

a)

particles have to collide with at least the activation energy

b)

particles have to collide with less than the activation energy

c)

particles don't have to collide with any energy

d)

particles don't have to collide with at least the activation energy

55.

On the diagram, which letter represents the activation energy for the reaction?

a)

A

b)

B

c)

C

56.

Which of the two reaction profiles shows the catalysed reaction?

a)

A

b)

B

57.

Which of the two reaction profiles shows the uncatalysed reaction?

a)

A

b)

B

58.

Complete the sentence:

Increasing the surface area of a solid increases the rate of reaction because there will be an increase in the (a)   of successful collisions

59.

Complete the sentence:

Increasing the concentration of a solution increases the rate of reaction because there will be an increase in the (a)   of successful collisions

60.

Complete the sentence:

Increasing the pressure of a gas increases the rate of reaction because there will be an increase in the (a)   of successful collisions

61.

Which of the following changes will increase the average energy of the particles?

a)

increasing the surface area

b)

increasing the concentration

c)

increasing the pressure

d)

increasing the temperature

62.

Increasing the temperature increases the rate of a chemical reaction because.......

a)

more particles have energy

b)

more particles have energy greater than or equal to the activation energy

c)

less particles have the activation energy

d)

the particles collide less frequently

63.

Which of the curves indicates the fastest reaction?

a)

A

b)

B

c)

C

64.

Which of the curves indicates the slowest reaction?

a)

A

b)

B

c)

C

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