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5.1 Notes

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  • 1. 5.1 The nature of chemical reactions Pages 148 - 153
  • 2. Goal 1 Understand what occurs during a chemical reaction and recognize the signs
  • 3.
    • Each compound or element
      • Has its own physical properties
        • Taste
        • Melting temp
        • Boiling temp
        • Color
  • 4.
    • Chemical reactions rearrange atoms
      • Reactants at start
      • Compounds are changed
      • Products at end
      • New properties shown
    2H 2 + O 2  2 H 2 O
  • 5.
    • Signs of chemical reaction
      • Gas formed
        • Bubbles
        • Odor
        • Smoke
  • 6.
    • Signs of chemical reaction
      • New solid formed
  • 7. Sodium sulfide + cadmium nitrate  cadmium sulfide (clear liquid) (clear liquid) (yellow solid)
  • 8.
    • Signs of chemical reaction
      • Color change
  • 9.
    • Signs of chemical reaction
      • Heat / light energy release
  • 10.
    • Signs of chemical reaction
      • Corrosion
  • 11. Goal 2 Describe energy movement and the difference between exothermic and endothermic reactions
  • 12.
    • Break bonds
      • Reactant break-up
      • Energy added
      • Heat, light, electricity, sound
    • Form bonds
      • Product formation
      • Energy released
    2H 2 + O 2  2 H 2 O
  • 13.
    • Energy is conserved in chemical reactions
    • All accounted for (what goes in…)
      • Absorbed
      • Stored
      • Released
  • 14.
    • Exothermic
      • Overall reaction releases energy
      • Reactants had more stored energy than products
  • 15.
    • Endothermic
      • Overall reaction absorbs energy
      • Reactants had less stored energy than products