1. Objective: To describe how temperature affects the rate of reaction
Temperature and Rate of Reaction
Objective: To describe how temperature affects the rate of reaction 6*
To explain how temperature affects rate of reaction in terms of particles 5
To plan and collect data to support / disprove a hypothesis. 4
To identify what happens to a chemical reaction when you heat it up.
Temperature, Heat, Rate of Reaction.

2. Reactions How do we know if a reaction has taken place? Color change
Gas given off
Precipitate forms
Temperature change
pH change

3. What do we mean by ‘rate of reaction?’
Is a way of describing how fast the reaction is happening.
Is it quick – like gas burning from a bunsen burner
Is it slow – like a rusting nail?

4. Hypothesis:
“The temperature of the water affects how fast the vitamin C tablet will dissolve” You have: Vitamin C Tablets Water Baths of 30, 45 and 60 degrees Tap Water Beakers Timers

5. You are going to plan an experiment to test your ideas
Step 1
Decide what you will do to investigate your question
Step 2
Independent Variable
What are you going to change?
Dependent Variable
What are you going to measure?
Step 3
Getting Accurate results
What variables do you need to control to make it a fair test?
Step 7
What do you Predict will happen and why?
Planning an investigation
Step 4
Getting Precise Results
What scale of measurement are you going to use?
Step 5
What equipment are you going to need?
Step 6
Do you need a control in your experiment?

6. Time for vitamin c tablet to dissolve(sec)
Experiment
Temperature (oC)
Time for vitamin c tablet to dissolve(sec)
Test 1
Test 2
Test 3
Average
30oC
45oC
60oC

7. Particles How do the particles differ in cold water and boiling water?
In boiling water the particles collide more often and with more force – they are moving quicker and with more energy…

8. Collisions
At higher temperatures molecules move faster as they have more energy – as a result there are more collisions per second and so a faster reaction occurs

9. Collisions If the temperature is increased:
The reactant particles move more quickly
The particles collide more often
The rate of reaction increases