Chemical Reactions

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Chemical Reactions

  1. 1. 1. Which of the following is an example of a physical change? A. dissolving salt into water B. hard-boiling an egg C. burning wood into charcoal D. rusting iron 2. Which of the following is an example of a chemical change? A. ice melting B. pounding gold into a coin C. paint fading D. a puddle of water evaporating 3. A chemical change occurs whenever . A. substances are mixed B. objects change shape C. hot objects melt D. new substances form 4. A chemical change can only be reversed by change. A. a chemical B. a physical C. both a physical and a chemical D. a phase
  2. 2. Review • Mixtures • Heterogeneous • Homogeneous • Separation of mixtures
  3. 3. Chemical Reactions ◙Chemical equations represent chemical reactions ◙Shows two things: ◙What you start with ◙What you end up with
  4. 4. Chemical Reactions Reactants- substance(s) you start with Left side of arrow () Products- substance(s) you end up with Right side of arrow ()
  5. 5. Chemical Reactions ▓Fe + S  FeS Reactants Product ▓The properties of iron sulfide are different from iron and sulfur
  6. 6. Signs of a Chemical Reaction Products have different properties than the reactants Color change Gas formation Solid precipitate forms Transfer or release of energy
  7. 7. Conservation of Matter In a chemical reaction, atoms rearrange New products form Is matter destroyed? No!!!!!!!
  8. 8. Conservation of Matter ☻Find the mass of the reactants ☻Reactants- all the substances that take part in the reaction Light Stick Plastic tube Liquid 1 Glass tube Liquid 2
  9. 9. Conservation of Matter ☺Find the mass of the products ☺Products- all the substances formed, new and/or existing Light Stick Plastic tube Broken glass New liquid
  10. 10. Conservation of Matter In any chemical reaction, no mass is gained or lost Mass of the reactants = the mass of all the products, seen or unseen

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