CONCLUSION to the BLUE LAB!

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

How do we know chemical reaction happened yesterday?

What are the types of chemical reactions?

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

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

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 NH3 + 10 H2O +BaCl2

EXOTHERMIC! This is the chemcial reaction for that cold pack. HEAT + Ba(OH)2 + 8 H2O + 2 NH4Cl → 2 NH3 + 10 H2O +BaCl2

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

Can you recognize which type of reaction it is just by its chemical reaction formula? 2 Cu + O2 2 CuO

OXIDATION! See how oxygen is the reactant in how copper corrodes. 2 Cu + O2 2 CuO

Some general types of chemical reactions… OXIDATION reactions NEED O2 as reactant combustion corrosion EXOTHERMIC reactions RELEASE HEAT! ENDOTHERMIC reactions ABSORB HEAT!

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

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

Not surprisingly, OXIDATION reactions are all EXOTHERMIC! OXIDATION reactions NEED O2 as reactant combustion corrosion EXOTHERMIC reactions RELEASE HEAT! ENDOTHERMIC reactions ABSORB HEAT!

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

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! SYNTHESIS reactions DECOMPOSITION reactions REPLACEMENT reactions

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! SYNTHESIS reactions DECOMPOSITION reactions REPLACEMENT reactions

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! SYNTHESIS reactions BUILDS things UP DECOMPOSITION reactions BREAKS DOWN REPLACEMENT reactions SWITCHEROO!

THAT WAS THE OL’ SWITCHEROO! 2 Cu + 4 HC2H3O2  Cu2(C2H3O2)4 + H2

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! SYNTHESIS reactions BUILDS things UP DECOMPOSITION reactions BREAKS DOWN REPLACEMENT reactions SWITCHEROO!

Can you see why it’s called photoSYNTHESIS!

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!

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! SYNTHESIS reactions BUILDS things UP DECOMPOSITION reactions BREAKS DOWN REPLACEMENT reactions SWITCHEROO!

LET’S DO A DECOMPOSITION REACTION!! elephant toothpaste!

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! SYNTHESIS reactions BUILDS things UP DECOMPOSITION reactions BREAKS DOWN REPLACEMENT reactions SWITCHEROO!

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

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

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

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

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

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

The hotter it is, the quicker it cooks.

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

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

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)

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…

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

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 particles react faster) copper powder reacted faster than pellets!

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

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

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 particles react faster) copper powder reacted faster than pellets!

finish elephant toothpaste demo…

Here’s the elephant toothpaste chemical reaction. 2H2O2  2H2O + O2 We will add some dishwashing liquid as a catalyst…

Here’s the elephant toothpaste chemical reaction. 2H2O2  2H2O + O2 We will add some dishwashing liquid as a catalyst… We will add a SECOND catalyst, some YEAST.

Here’s the elephant toothpaste 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)