1. Plan for Today Introductions weebly New Unit: Chemical Reactivity
Rates of Reactions

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Physics
2.6 Electricity and electromagnetism

3. AS2.6 Chemical Reactivity
Rates of Reaction
Equilibrium
Acids and Bases

4. Collision Theory
Molecules need to collide with enough energy AND in the correct orientation in order for a reaction to occur

5. Rates of Reaction Factors that affect the Rate of Reaction
Temperature
Concentration
Catalyst
Surface Area
How do each of these relate to Collision Theory?

6. Tomorrows Experiment
Hydrochloric acid reacts with sodium thiosulfate to produce a cloudy white precipitate.
You and a partner will be investigating the effect of either temperature or concentration on reaction rate.
Key focus will be on data collection and presentation (data table and graph to show trend).

7. Instructions for Lab Concentration Temperature
You will be given 0.2M Na2S2O3 and 2M HCl
Reduce the concentration of one reactant to get at least 5 data points.
Ex: 0.2, 0.16,
Temperature
You will be given 0.05M Na2S2O3 and 2M HCl
Use a water bath to increase the temperature incrementally to get at least 5 data points
Ex: 30, 40, 50...

8. Example Table
Concentration of reactant X (or) Temp of reactants
Variable 1
Var 2
Var 3
Var 4
Var 5
Trial 1
Trial 2
Trial 3
Average time in Seconds
When you are finished testing, plot your results on a graph with time on the X axis
Be prepared to share your results

9. Daily Warm Up
Define/explain Collision Theory in your own words

10. Daily Warm Up
List four factors that can effect the rate of a chemical reaction
Pick one factor and use collision theory to explain how that factor effects the rate of reaction