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
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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!
6 Signs of a Chemical Reaction!6 Signs of a Chemical Reaction!
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!
6 Signs of a Chemical Reaction!6 Signs of a Chemical Reaction!
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!
6 Signs of a Chemical Reaction!6 Signs of a Chemical Reaction!
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!
6 Signs of a Chemical Reaction!6 Signs of a Chemical Reaction!
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
6 Signs of a Chemical Reaction!6 Signs of a Chemical Reaction!
ODORODOR Produces new smells as the reaction Produces new smells as the reaction
occursoccurs Examples: Rotting, bad breathExamples: Rotting, bad breath
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