1. LAB RECAP: Spot, Spot...

2. CaSO4
HCl
Insoluble, white ppt
soluble
MgSO4
H2SO4
Soluble
soluble
Na2SO4
H2CO3
Soluble
Creates CO2 gas

3. Na2CO3
Sodium carbonate
H2CO3
Hydrogen carbonate
BUBBLES!
CaSO4
Calcium sulfate
CaCl2
Calcium chloride
White ppt!
MgSO4 & H2SO4
MgSO4
Magnesium sulfate
NOTHING!

4. NOTES #6: Kinetics
WCHS Chemistry

5. HOW CAN YOU MAKE A SUGAR CUBE DISSOLVE QUICKLY IN WATER?
There are SIX ways to make this happen! You can proabbly give me THREE before we even get started!
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6. KINETICS!
= the speed (a.k.a rate) of a chemical reaction

7. FACTORS THAT INFLUENCE KINETICS
Physical State
Solids with greater surface area (= in smaller pieces) react faster!

8. HOW TO LIGHT A LOG ON FIRE?
USE KINDLING!!

9. FACTORS THAT INFLUENCE KINETICS
Physical State
Solids with greater surface area (= in smaller pieces) react faster!
Ex: Small twigs burns faster than a large piece of wood.

10. FACTORS THAT INFLUENCE KINETICS
Stirring
Speeds up the motion of the particles
More movement = more collisions!
Particles find each other and react faster!
Ex: Stirring sugar to dissolve it in water

11. FACTORS THAT INFLUENCE KINETICS
Temperature
Speeds up the motion of the particles
More movement = more collisions!
Particles find each other and react faster!
FUN FACT: Every 10o C you increase the temperature, DOUBLES the rate of the reaction!

12. EX: Why we used a hot water bath in some of our experiments!

13. FACTORS THAT INFLUENCE KINETICS
Concentration of Reactants
(Concentration = how much STUFF you have)
Increased concentration = faster reaction
More molecules = more collisions happening = faster reaction!
Ex: 1 M H2SO4 vs. 3 M H2SO4 in our Spot Spot lab

14. FACTORS THAT INFLUENCE KINETICS
Catalyst
Makes reactions go faster by decreasing activation energy
Catalysts speed up a reaction WITHOUT being used/ a part of the reaction.
If you have 5 g of catalyst before, you will have 5 g after also.

15. FACTORS THAT INFLUENCE KINETICS
Inhibitor
= a substance that slows down the rate of a reaction
Why would we want to do this?

16. Slow down the rate of food spoilage!
FOOD PRESERVATIVES!
Slow down the rate of food spoilage!

18. Hot tea will get to 100C VERY fast
Sun tea won’t get that hot, so needs LONGER time to make up for low temp