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Changing Matter

Changing Matter. Physical & Chemical Changes. Physical Properties. Anything that can be observed without changing the identity of the substance. (Tends to be measurable.). melting point boiling point electrical conductivity color density thermal conductivity ductility malleability.

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Changing Matter

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  1. Changing Matter Physical & Chemical Changes

  2. Physical Properties • Anything that can be observed without changing the identity of the substance. (Tends to be measurable.) • melting point • boiling point • electrical conductivity • color • density • thermal conductivity • ductility • malleability

  3. Chemical Properties • The way a substance may change or react to form other substances • Heat of Combustion • Reactivity with Water • Oxidation • Flammability

  4. Matter can be changed two ways • Physically • Physical reaction • Physical change • Chemically • Chemical reaction • Chemical change

  5. Physical Changes • DoNOT CHANGE THE TYPE OF MATTER • Nothing new or different is formed • Could be a change in: • Mass • Volume • Density • Change in state • Color • Shape Size

  6. Examples of Physical Changes • Boiling • Freezing • Dissolving • Breaking • Making a mixture • 2 or more types of matter (substances) mixed together • Not in specific amounts • Can be separated physically

  7. Chemical Changes • The composition of the substance changes. • The substances present at the beginning of the change are not present at the end; new substances are formed. The change cannot be “undone.” Picture from www.chem4kids.com

  8. Chemical Changes • Evidence of a chemical reaction • Formation of gas • Formation of precipitate • Change in color • Change in energy • EndothermicAbsorbs heat energy (gets cold) • ExothermicReleases heat energy (gets hot)

  9. Chemical Changes • Atoms are re-arranged, NOT created or destroyed

  10. Physical or Chemical? • Painting Wood • Burning Paper • Digesting Food • Sugar Dissolving in Water • Iron Turning Red When Heated • Evaporation of Water

  11. Physical or Chemical? • Pond Freezing in the Winter • Cutting Wire • Baking Muffins • Decomposition of Old Leaves • Painting Fingernails • Silver Tarnishing

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