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Chemical Reactions

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

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Chemical Reactions

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  1. Chemical Reactions

  2. 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

  3. 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

  4. 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

  5. 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. 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

  7. 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!

  8. 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

  9. 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!

  10. 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

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

  12. 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

  13. 6 Signs of a Chemical Reaction! ODOR • Produces new smells as the reaction occurs • Examples: Rotting, bad breath

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