(O) Topic 5 - Kinetics

Question 1

Draw:

A Maxwell - Boltzmann Distrubution Curve

Answer 1

Refer to notes for answer:
Y-axis - number of particles
X-axis - Energy
Peak of curve - Most Probable energy
Average energy - 1/2 area
Activation energy - particles above are reacting
Aymptote at the end

Question 2

Explain how increasing concentration of a substance affects the rate of reaction

Answer 2

Increase in concentration increases the number of particles per unit volume. There are more frequent succesful collisions and so the rate of reaction is faster.

Question 3

Explain how increasing surface area affects the rate of reaction

Answer 3

Increased surface area means there is a higher area for particles to collide. There are more frequent succesful collision, and so the rate of reaction increases.

Question 4

Explain how an increase in temperature affects the rate of reaction

Answer 4

Increasing temperature means there is more kinetic energy so the particles move faster. There are more frequent succesful collisions with the minimum activation energy and so there is an increased rate of reaction.

Question 5

Explain how the addition of a catalyst affects the rate of reaction.

Answer 5

A catalyst provides an alternate route with a lower activation energy. This means there are more frequent succesful collisions, and a faster rate of reaction occurs.

Question 6

Draw:

A graph showing how temperature effects rate of reaction

Answer 6

Refer to notes for answers

Question 7

Draw:

A graph to show how concentration affects rate of reaction

Answer 7

Refer to notes for answers

Question 8

Draw:

A graph to show how increased surface area affects rate of reaction

Answer 8

Refer to notes for answers

Question 9

Draw:

A graph to show how addition of a catalyst affects rate of reaction

Answer 9

Refer to notes for answers

Question 10

What is:

The Maxwell-Boltzmann Distrubution Curve

Answer 10

It shows the distrubution of molecular energy in a sample of gas

Question 11

Draw:

The Maxwell Distrubution curve with increased and decreased temperature

Answer 11

Refer to notes for answers

Question 12

Draw:

The Maxwell-Distrubution Curve with a Catalyst

Answer 12

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Question 13

Draw:

The Maxwell Distrubution curve with half the number of molecules

Answer 13

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Question 14

Draw:

The Maxwell-Distrubution Curve if the volume of the container is reduced or an inert gas is added

Answer 14

Refer to notes for answers