Effect of temperature on rate of reaction

Effect of temperature on rate of reaction

Dr Ahmed

Effect of temperature on rate of reaction

• State how changing the temperature will change the reaction rate

• Apply your knowledge of the effect of temperature to make predictions about given reactions

• Explain the effect of temperature in terms of collision theory

Quick recap on collision theory

Open Ended

What is required for a reaction to be successful? (be as thorough as you can)

Multiple Select

Which two things will increase rate of reaction?

• Frequency of collisions

• Angle of collisions

• Energy of collisions

• The active site of reactants

Open Ended

What will happen if two particles collide but don't have enough energy?

Watch the video carefully

Make notes about what you see

Take a minute to complete your thoughouts on what happened

Open Ended

What did you see and how can you explain that using what you know about rate of reaction?

Effect of temperature

• Increasing temperature of anything causes the particles the move more quickly

• If the particles move more quickly they will collide more frequently

• The faster they move, the more energy they will collide with

• This increases the rate of reation

How will this look?

Sketch the graph in your exercise book and add a second line to show how it will look if the reaction is doen at a higher temperature

How will this look

You can see if you increase the temperature the graph is steeper at the beginning. It reaches the plateau more quickly.

The plateau is when ALL the reactants have become products.

Multiple Choice

True or false...

Rate of reaction is a measure of how much product is made

• True

• False

Multiple Choice

True or false...

Collisions are successful if the particles have more energy than the activation energy

• True

• False

Multiple Choice

True or false...

Concentration is a measure of the number of particles in a given volume

• True

• False

Multiple Choice

True or false...

For the same mass, big particles have a higher surface area than small particles

• True

• False

Multiple Choice

True or false...

The lower the surface area the higher the rate of reaction

• True

• False