Chemical Reactions. Produce new substances by changing the way in which atoms are arranged. Produce...

Chemical Chemical ReactionsReactions

Chemical ReactionsChemical Reactions Produce new substances Produce new substances

by changing the way in by changing the way in which atoms are which atoms are arranged.arranged.

REACTANTSREACTANTS= substances = substances used in a chemical used in a chemical reactionreaction

PRODUCTSPRODUCTS= substances = substances formed by chemical formed by chemical reactionreaction

Sign #1Sign #1

Reactants: Cabbage Juice and Vinegar; Reactants: Cabbage Juice and Vinegar; Cabbage Juice and Baking SodaCabbage Juice and Baking Soda

Add 10 mL of cabbage juice to 2 test tubesAdd 10 mL of cabbage juice to 2 test tubes Add a few drops of vinegar to one test tubeAdd a few drops of vinegar to one test tube Add one lab scoop of baking soda to anotherAdd one lab scoop of baking soda to another

6 Signs of a Chemical Reaction!6 Signs of a Chemical Reaction!

COLOR CHANGECOLOR CHANGE Substances change colorSubstances change color Color change is a product of two or more reactantsColor change is a product of two or more reactants Examples: Rust, leaves changing color, moldExamples: Rust, leaves changing color, mold

Sign #2Sign #2

Reactants: Baking Soda and Vinegar (Acetic Reactants: Baking Soda and Vinegar (Acetic Acid)Acid)

10 mL of Vinegar in test tube10 mL of Vinegar in test tube 1 lab scoop of baking soda1 lab scoop of baking soda Swirl and observe!Swirl and observe!


FORMATION OF A GASFORMATION OF A GAS Bubbles often appear Bubbles often appear Fizzes Fizzes A product gas is leaving the reaction mixtureA product gas is leaving the reaction mixture Examples: vinegar + baking soda = carbon Examples: vinegar + baking soda = carbon

dioxidedioxide

Sign #3Sign #3

Reactants: Citric Acid and Baking SodaReactants: Citric Acid and Baking Soda 10 mL Citric acid in test tube10 mL Citric acid in test tube Take temperatureTake temperature Combine w/ 1 lab scoop of baking sodaCombine w/ 1 lab scoop of baking soda Swirl and observe temperature!Swirl and observe temperature!


ENDOTHERMIC REACTION ENDOTHERMIC REACTION (temperature/energy change)(temperature/energy change)

Chemical bonds breakChemical bonds break Energy (heat) is absorbed from surroundingsEnergy (heat) is absorbed from surroundings Substance seems coolerSubstance seems cooler Examples: baking, cold packs, photosynthesisExamples: baking, cold packs, photosynthesis

Sign #4Sign #4

Reactants: Hydrogen Peroxide and YeastReactants: Hydrogen Peroxide and Yeast 10 mL Hydrogen Peroxide in test tube10 mL Hydrogen Peroxide in test tube Take temperatureTake temperature Combine w/ 1 lab scoop of yeastCombine w/ 1 lab scoop of yeast Swirl and observe temperature!Swirl and observe temperature!


EXOTHERMIC REACTION EXOTHERMIC REACTION (temperature/energy change)(temperature/energy change) Chemical bonds are madeChemical bonds are made Energy (heat) is released to surroundingsEnergy (heat) is released to surroundings Substance seems warmerSubstance seems warmer Examples: fireworks, explosions, hand warmersExamples: fireworks, explosions, hand warmers

Sign #5Sign #5

Reactants: Ammonia and dissolved Epsom Reactants: Ammonia and dissolved Epsom SaltSalt

40 mL ammonia40 mL ammonia 1 tsp epsom salt dissolved in 40 mL hot water1 tsp epsom salt dissolved in 40 mL hot water Combine and observe!Combine and observe!


A PRECIPITATE IS FORMEDA PRECIPITATE IS FORMED A solid that forms when two liquids combineA solid that forms when two liquids combine The solid particles are the product The solid particles are the product Examples: Kidney stones, pearls, cheeseExamples: Kidney stones, pearls, cheese


ODORODOR Produces new smells as the reaction Produces new smells as the reaction

occursoccurs Examples: Rotting, bad breathExamples: Rotting, bad breath

Chemical Reactions. Produce new substances by changing the way in which atoms are arranged. Produce...

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