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Balancing Equations 101: Physical vs. Chemical Changes

Learn the distinction between physical and chemical changes through examples such as melting ice and burning candles. Explore how chemical reactions create new substances from Mg and HCl or electrolysis of water.

darius-tate
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Balancing Equations 101: Physical vs. Chemical Changes

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  1. Please place Balancing Equations 101 out to be collected.

  2. Today’s Goal: • Explain the difference between Physical Change and Chemical Change

  3. Physical Change A change in a substance that does not change the identity of the substance.

  4. Physical Change • Examples: • Ice melting • Ripping paper in half • Mixing ice tea mix in water • Chewing your food

  5. Chemical Change A change in a substance that results in a new substance being formed.

  6. Chemical Change • Examples: • Burning a match • Cooking food • Rust forming • Digesting food

  7. Physical Change or Chemical Change ? You decide.. Baking a cake Chemical change The melting wax on a candle Physical change Putting salt on the icy sidewalk Physical change Burning the wick of a birthday candle Chemical change

  8. Physical Change or Chemical Change ? You decide.. Sawing a piece of wood Physical change Cutting your hair Physical change Bleaching your hair Chemical change Coloring in a coloring book Physical change

  9. Chemical changes create new substances. New substances are the result of a chemical reaction.

  10. Mg(s) + 2 HCl(aq) → MgCl2­(aq) + H2(g)

  11. Another example : Electrolysis of water produces new substances known as Hydrogen and Oxygen gas (H2) (O2) 2H2O(l) --> 2H2(g) + O2(g)

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