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Energy in reactions and rates of reactions 2023

Last updated 10 months ago
16 questions
Required
1

Required
1

The following energy profiles for four different reactions are shown below.
Which reaction is the most exothermic?

Required
2

Consider the four energy profile graphs shown below:

Identify the two diagrams that could represent the same reaction catalysed and uncatalysed.

  • graph 1
  • graph 2
  • graph 3
  • graph 4
  • Graph showing reaction with catalyst present
  • Graph showing reaction with NO catalyst present
Required
1

Which of the following reactions releases the most energy to the surroundings?

1

Is the following statement True or False?

5

Consider the following potential energy profile with labels A - F.

Which label (A - F) matches each of the following?

  • A
  • B
  • C
  • D
  • E
  • F
  • The energy of the products?
  • The energy of the activated complex?
  • The activation energy (forward reaction)?
  • Heat of reaction/change in enthalpy?
  • The activation energy for the reverse reaction?
2

What TWO requirements are there for a collision to be effective/successful?

EXPT 1 - Consider the following experiment conducted to measure the rate of reaction between a metal and acid.

1

What change will DECREASE the rate of reaction?

1

Which of these Boltzmann distributions represents the effect of increasing the temperature of acid?

Consider the energy profile diagrams representing three different chemical reactions.
1

Which of these reactions is likely to proceed at the slowest rate?

1

Assume the that reaction C is a reaction between hydrogen and nitrogen to form ammonia.
The equation for Reaction C can be written as:

1

Which of the following units can be used to express the rate of a chemical reaction?

1

An 8 g piece of magnesium was placed into 6 mol.dm-3 HCl. After 25 s, 3,50 g of unreacted magnesium remained.
The average rate at which magnesium was used up is:

Note that HCl is in excess.
Experiment 1 corresponds to graph B.
2

Experiment 2 is graph ....

2

Experiment 3 is graph .....

2

Experiment 4 is graph ....

THE END OF THE ASSESSMENT

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