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Changes in Matter

Changes in Matter. Physical Change. The form or appearance of the sample may change but the identity remains the same. Crumpling Cutting, crushing, grinding,tearing Phase changes Dissolving. Representing Change. Use “equations” to show change. Substances Before  Substances After.

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Changes in Matter

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  1. Changes in Matter

  2. Physical Change • The form or appearance of the sample may change but the identity remains the same. • Crumpling • Cutting, crushing, grinding,tearing • Phase changes • Dissolving

  3. Representing Change • Use “equations” to show change. Substances Before  Substances After By the Way In a physical change, you have the same stuff before & after. The formulas match!

  4. Dissolving • Dissolving is a physical change. • Think of sugar in water. You still have sugar – you just spread it out and put water molecules in between. • C6H12O6(s)  C6H12O6(aq) =

  5. Dissolving source

  6. Phase Changes • Phase changes are physical changes. • No new substance is created (chemical formula stays the same) • ice melting: H2O(s)  H2O(l) • water boiling: H2O (l)  H2O(g)

  7. Chemical Change • In a chemical change the identity of the matter is changed. • A new substance with unique properties is formed. • The chemical formula changes. • Ex: 2H2O(l)  2H2(g) + O2(g) 

  8. Chemical decomposition of water. 2H2O(l)  2H2(g) + O2(g) Decomposition = Reaction where a molecule breaks down into simpler substances. source

  9. 2H2O(l)  2H2(g) + O2(g)

  10. Burning • Common name for an oxidation reaction. • Burning means reacting with oxygen. • Burning is a chemical change, because the original substance is changed into new kinds of matter. • Ex: CH4(g) + 2O2(g)  CO2(g) + 2H2O(g) Formulas don’t match!

  11. CH4(g) + 2O2(g)  CO2(g) + 2H2O(g) Formulas don’t match! source

  12. Other Chemical Changes • Cooking • Fermentation • Corrosion • Rotting • Explosion • Synthesis

  13. Evidence of Chemical Change • Produce Heat • Produce Light • Evolution of a Gas • Formation of a Precipitate • Change in Properties …meaning… Create something NEW

  14. Conservation of Mass • Mass is neither created nor destroyed. • Mass is conserved. • Massreactants = Massproducts • Massbefore = Massafter • # of atoms before = # of atoms after

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