1. CONCLUSION to the BLUE LAB!

2. How do we know chemical reaction happened yesterday?

3. How do we know chemical reaction happened yesterday?
major, unexplained, color change
major, unexplained temperature change
major, unexplained bubbles gas created
precipitate forms.

4. Go over rest of sheet…

5. What are the types of chemical reactions?

6. We have already learned about 3 general types of chemical reactions:

7. Which two below need oxygen?
OXIDATION reactions NEED O2 as reactant

8. Which two below need oxygen?
OXIDATION reactions NEED O2 as reactant
combustion
corrosion

9. What are the two ways heat/energy can flow in a reaction?
OXIDATION reactions NEED O2 as reactant
combustion/fire
corrosion/rusting E

10. We have already learned about 3 general types of chemical reactions:
OXIDATION reactions NEED O2 as reactant
combustion/fire
corrosion/rusting
EXOTHERMIC reactions RELEASE HEAT!
ENDOTHERMIC reactions ABSORB HEAT!

11. HEAT + Ba(OH)2 + 8 H2O + 2 NH4Cl → 2 NH3 + 10 H2O +BaCl2
Can you recognize which type of reaction it is just by its chemical reaction formula?
HEAT + Ba(OH)2 + 8 H2O + 2 NH4Cl → 2 NH H2O +BaCl2

12. ENDOTHERMIC! This is the chemcial reaction for that cold pack.
HEAT + Ba(OH)2 + 8 H2O + 2 NH4Cl → 2 NH H2O +BaCl2

13. General types of chemical reactions:
OXIDATION reactions NEED O2 as reactant
combustion/fire
corrosion/rusting
EXOTHERMIC reactions RELEASE HEAT!
ENDOTHERMIC reactions ABSORB HEAT!

14. Can you recognize which type of reaction it is just by its chemical reaction formula?
2 Cu + O CuO

15. OXIDATION! See how oxygen is the reactant in how copper corrodes.
2 Cu + O CuO

16. Some general types of chemical reactions…
OXIDATION reactions NEED O2 as reactant
combustion/fire
corrosion/rusting/tarnishing
EXOTHERMIC reactions RELEASE HEAT!
ENDOTHERMIC reactions ABSORB HEAT!

17. Can you recognize which type of reaction it is just by its chemical reaction formula?

18. BOTH EXOTHERMIC & OXIDATION!
THIS IS AN EXOTHERMIC COMBUSTION REACTION OF OCTANE IN YOUR CAR ENGINE!

19. Not surprisingly, ALL OXIDATION reactions are all EXOTHERMIC!
OXIDATION reactions NEED O2 as reactant
combustion/fire
corrosion/rusting/tarnishing
EXOTHERMIC reactions RELEASE HEAT!
ENDOTHERMIC reactions ABSORB HEAT!

20. YOU COMBUST…. YOU RUST…. YOU ARE EXOTHERMIC!

21. What was yesterday’s reaction?
2 Cu HC2H3O2  Cu2(C2H3O2) H2

22. It was EXOTHERMIC for SURE, but not with OXYGEN GAS as a reactant
OXIDATION reactions NEED O2 as reactant
combustion/fire
corrosion/rusting/tarnishing
EXOTHERMIC reactions RELEASE HEAT!
ENDOTHERMIC reactions ABSORB HEAT!

23. THAT WAS THE OL’ SWITCHEROO!
2 Cu HC2H3O2  Cu2(C2H3O2) H2

24. THERE’S A FEW MORE GENERAL TYPES OF CHEMICAL REACTIONS we should know.
OXIDATION reactions NEED O2 as reactant
combustion
corrosion
EXOTHERMIC reactions RELEASE HEAT!
ENDOTHERMIC reactions ABSORB HEAT!
REPLACMENT reactions

25. THERE’S A COUPLE MORE GENERAL TYPES OF CHEMICAL REACTIONS we should know.
OXIDATION reactions NEED O2 as reactant
combustion
corrosion
EXOTHERMIC reactions RELEASE HEAT!
ENDOTHERMIC reactions ABSORB HEAT!
REPLACEMENT reactions-switcheroo!!

26. Can you see why it’s called photoSYNTHESIS!??

27. Can you see why it’s called photoSYNTHESIS!??
12 small molecules here BIGGER molecule

28. Can you see why it’s called photoSYNTHESIS!
phytoplankton & plants take 6 small molecules of carbon dioxide & water and turn it into 1 BIG glucose!

29. THERE’S A FEW MORE GENERAL TYPES OF CHEMICAL REACTIONS we should know.
OXIDATION reactions NEED O2 as reactant
combustion
corrosion
EXOTHERMIC reactions RELEASE HEAT!
ENDOTHERMIC reactions ABSORB HEAT!
REPLACEMENT reactions—switcheroo!!
SYNTHESIS reactions BUILDS things UP

30. THERE’S A FEW MORE GENERAL TYPES OF CHEMICAL REACTIONS we should know.
OXIDATION reactions NEED O2 as reactant
combustion
corrosion
EXOTHERMIC reactions RELEASE HEAT!
ENDOTHERMIC reactions ABSORB HEAT!
REPLACEMENT reactions—switcheroo!!
SYNTHESIS reactions BUILDS things UP!
DECOMPOSITION reactions BREAKS DOWN

31. LET’S DO A DECOMPOSITION REACTION!!
LET’S BREAK DOWN HYDROGEN PEROXIDE!

32. How can we SPEED the reaction up?
This can take months…most decomposition reactions do.

33. How can we SPEED the reaction up?
ADD A CATALYST (substance that speeds up a reaction without getting involved)
chlorophyll in photosynthesis
salt for water electrolysis
sulfuric acid for oxidizing sugar

34. Catalysts are substances that speed reactions up without changing themselves…
Like a baby walker helps a newborn walk…
…BUT is unchanged.

35. Catalysts are substances that speed reactions up without changing themselves…
Like slippery OIL helps the engine run faster…
…BUT is unchanged.

36. How can we SPEED the reaction up?
ADD A CATALYST (substance that SPEEDS up a reaction WITHOUT getting involved)
chlorophyll in photosynthesis
salt for water electrolysis
sulfuric acid for oxidizing sugar
H2O2 for speeding up our blue lab

37. How can we SPEED the reaction up?
ADD A CATALYST (substance that speeds up a reaction but IT DOESN’T CHANGE)
chlorophyll in photosynthesis
salt for water electrolysis
INCREASE TEMPERATURE (speeds up the molecules to react faster)
warming up our potassium permanganate & glycerin reaction

38. Molecules move faster when heated.
The hotter it is, the quicker it cooks.

39. How can we SPEED the reaction up?
ADD A CATALYST (substance that speeds up a reaction without getting involved)
chlorophyll in photosynthesis
salt for water electrolysis
INCREASE TEMPERATURE (speeds up the molecules to react faster)
warming up our potassium permanganate & glycerin reaction

40. What would work faster?
You want to use 4% or 40% H2O2?

41. How can we SPEED the reaction up?
ADD A CATALYST (substance that speeds up a reaction without getting involved)
chlorophyll in photosynthesis
salt for water electrolysis
INCREASE TEMPERATURE (speeds up the molecules to react faster)
warming up our potassium permaganate & glycerin reaction
INCREASE CONCENTRATION (potency of reactants can speed things along)

42. LAST ONE!
ADD A CATALYST (substance that speeds up a reaction without getting involved)
chlorophyll in photosynthesis
salt for water electrolysis
INCREASE TEMPERATURE (speeds up the molecules to react faster)
warming up our potassium permaganate & glycerin reaction
INCREASE CONCENTRATION (potency of reactants can speed things along)
INCREASE…

43. Which reacted faster yesterday, the copper powder or copper pellets?
WHY?

44. How can we SPEED the reaction up?
ADD A CATALYST (substance that speeds up a reaction without getting involved)
chlorophyll in photosynthesis
salt for water electrolysis
INCREASE TEMPERATURE (speeds up the molecules to react faster)
warming up our potassium permaganate & glycerin reaction
INCREASE CONCENTRATION (potency of reactants can speed things along)
INCREASE the SURFACE AREA (smaller bits react faster)
copper powder reacted faster than pellets!

45. Afterall, which works faster to get rid of your headache?
GOODY’S HEADACHE POWDER
BAYER ASPIRIN PILL

46. Goody’s powder has more surface area to react quicker than chunky pills.
GOODY’S HEADACHE POWDER
BAYER ASPIRIN PILL

47. How can we SPEED the reaction up?
ADD A CATALYST (substance that speeds up a reaction without getting involved)
chlorophyll in photosynthesis
salt for water electrolysis
INCREASE TEMPERATURE (speeds up the molecules to react faster)
warming up our potassium permanganate & glycerin reaction
INCREASE CONCENTRATION (potency of reactants can speed things along)
INCREASE the SURFACE AREA (smaller bits react faster)
copper powder reacted faster than pellets!

48. finish elephant toothpaste demo…

49. Here’s the HYDROGEN PEROXIDE DECOMPOSITION chemical reaction.
2H2O2  2H2O + O2
We will add some dishwashing liquid as a CATALYST…

51. Here’s the HYDROGEN PEROXIDE DECOMPOSITION chemical reaction.
2H2O2  2H2O + O2
We will add some dishwashing liquid as a CATALYST…
We will add a SECOND CATALYST, some YEAST.

52. Here’s the HYDROGEN PEROXIDE DECOMPOSITION chemical reaction.
2H2O2  2H2O + O2
We will add some dishwashing liquid as a catalyst…
And we will add a second catalyst: yeast.
And we got water (H2O) & a whole bunch of oxygen gas (O2)