Chemical Reactions! - Kyrene School District

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

REACTANTS= substances used in a chemical reaction PRODUCTS= substances formed by chemical reaction Sign #1

Reactants: Cabbage Juice and Vinegar; Cabbage Juice and Baking Soda Add 10 mL of cabbage juice to 2 test tubes Add a few drops of vinegar to one test tube Add one lab scoop of baking soda to another 6 Signs of a Chemical Reaction! COLOR CHANGE

Substances change color Color change is a product of two or more reactants Examples: Rust, leaves changing color, mold Sign #2

Reactants: Baking Soda and Vinegar (Acetic Acid) 10 mL of Vinegar in test tube 1 lab scoop of baking soda Swirl and observe! 6 Signs of a Chemical Reaction! FORMATION OF A GAS

Bubbles often appear Fizzes A product gas is leaving the reaction mixture Examples: vinegar + baking soda = carbon dioxide Sign #3

Reactants: Citric Acid and Baking Soda 10 mL Citric acid in test tube Take temperature Combine w/ 1 lab scoop of baking soda Swirl and observe temperature! 6 Signs of a Chemical Reaction! ENDOTHERMIC REACTION (temperature/energy change)

Chemical bonds break Energy (heat) is absorbed from surroundings Substance seems cooler Examples: cold packs, photosynthesis Sign #4

Reactants: Hydrogen Peroxide and Yeast 10 mL Hydrogen Peroxide in test tube Take temperature Combine w/ 1 lab scoop of yeast Swirl and observe temperature! 6 Signs of a Chemical Reaction!

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

Sign #5 Reactants: Ammonia and dissolved Epsom Salt 40 mL ammonia 1 tsp epsom salt dissolved in 40 mL hot water Combine and observe!

6 Signs of a Chemical Reaction! A PRECIPITATE IS FORMED A solid that forms when two liquids combine The solid particles are the product Examples: Kidney stones, pearls, cheese 6 Signs of a Chemical Reaction!

ODOR Produces new smells as the reaction occurs Examples: Rotting, bad breath

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