CONCLUSION to the BLUE LAB!

How do we know chemical reaction happened yesterday?

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

Go over rest of sheet…

What are the types of chemical reactions?

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

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

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

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

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!

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

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

General types of chemical reactions: OXIDATION reactions NEED O2 as reactant combustion/fire corrosion/rusting 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/fire corrosion/rusting/tarnishing 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, 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!

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

What was yesterday’s reaction? 2 Cu + 4 HC2H3O2  Cu2(C2H3O2)4 + 2 H2

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!

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

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!!

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

Can you see why it’s called photoSYNTHESIS!?? 12 small molecules here 1 BIGGER molecule

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! REPLACEMENT reactions—switcheroo!! SYNTHESIS reactions BUILDS things UP

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

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

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 sulfuric acid for oxidizing sugar

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 slippery 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 sulfuric acid for oxidizing sugar H2O2 for speeding up our blue lab

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

Molecules move faster when heated. 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 permanganate & 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 bits 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 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!

finish elephant toothpaste demo…

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

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.

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)