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Physical and Chemical Properties

Physical and Chemical Properties. Lesson 2. Physical Properties. - A physical property describes a characteristic of a substance that can be observed or measured without changing the composition of matter. Example: Melting Point, Boiling Point.

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Physical and Chemical Properties

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  1. Physical and Chemical Properties Lesson 2

  2. Physical Properties • -A physical property describes a characteristic of a substance that can be observed or measured without changing the composition of matter. • Example: Melting Point, Boiling Point

  3. When water freezes it expands due to a special bonding between water molecules. • Larger volume with the same mass = Less dense • This is why ice floats

  4. Observing Physical Properties

  5. Observing Physical Properties

  6. Observing Physical Properties

  7. Observing Physical Properties

  8. Observing Physical Properties

  9. Observing Physical Properties

  10. Observing Chemical Properties • A chemical property describes the ability of a substance to change into a new substance or substances. • In order to view a chemical property a chemical changemust occur. • Chemical change - the formation of a new substance or substances with new properties. • A chemical reaction is a process in which a chemical change occurs.

  11. Chemical Properties 1. Combustibility is the ability of a substance to burn. In order to burn a substance requires Oxygen

  12. Chemical Properties • Light sensitivity is a chemical property of that can cause new substances to form when light hits it.

  13. Chemical Properties 3. Reacting with an acid is a chemical property where when acid is poured on a substance it produces a gas and bubbles.

  14. Physical Change • In a physical change, the substance involved remains the same (chemically). The substance may change form or state, however. All changes of state are physical changes. • Examples: Dissolving a substance in a liquid, breaking something. • NOTE: Most physical changes can be reversed.

  15. Chemical changes • In a chemical Change the substance is changed into one or more different substances. • The new substances have different properties from the original substance. • Most chemical changes are difficult to reverse and most cannot be. The new substances are not likely to combine and form the original substance.

  16. Often during a chemical change you cannot see the change that has occurred in the substance, but you can observe the results of the change. There are clues that suggest that a chemical change has taken place.

  17. Clues that a chemical change has occurred

  18. Clues that a chemical change has occurred

  19. Lab and Practice Questions – hand in

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