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Physical and Chemical Changes

Physical and Chemical Changes. 7 th Grade Notes pg. 600-603 Mini lab- comparing changes. Do now…. What is the difference between vaporization and condensation? Answer: vaporization-liquid to gas; condensation-gas to liquid. Objectives. Students will…

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Physical and Chemical Changes

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  1. Physical and Chemical Changes 7th Grade Notes pg. 600-603 Mini lab- comparing changes

  2. Do now… • What is the difference between vaporization and condensation? • Answer: vaporization-liquid to gas; condensation-gas to liquid

  3. Objectives • Students will… • Compare several chemical and physical changes • Identify examples of chemical and physical changes

  4. Physical changes (pgs.600-601)

  5. Changes of state (pgs. 601)

  6. Chemical Changes • In a physical change, how the object looks changes, but what it is made of does not change. • In a chemical change, substances are changed into different substances. • Rusting is one example of a chemical change in which water and oxygen in air react with iron in steel to form a reddish, powdery substance.

  7. Mini Lab: comparing changes (part 1) • Purpose: Students will observe a chemical change with a piece of steel wool. • Directions and Lab Procedures • Prediction: What do you think will happen to the steel wool overnight?

  8. For Next Time…. • Reviewing Chemical and Physical Changes Read pgs. 604-609 Define: chemical change and law of conservation of mass on index cards Lab due Thursday

  9. Physical and Chemical Changes 7th Grade Mini Lab Lecture/Notes

  10. Do Now Together… • Finish Mini Lab: Comparing Changes (Part 2) • Make observations and answer lab questions.

  11. Objectives • Students will… • Complete Mini Lab Compare several chemical and physical changes • Identify examples of chemical and physical changes

  12. Signs of Chemical Changes (pgs. 603-606)

  13. Chemical vs. Physical Change • Classify each of the following events as a physical change or a chemical change. • 1. A tree is cut into lumber. • 2. Copper is bent. • 3. Marble dissolves in acid rain. • 4. Wood is burned.

  14. Converting temperatures (pg. 606) • The equation that relates Celsius degrees to Fahrenheit degrees is: • (C x 1.8) + 32= F • Practice • 1- Water is being heated on the stove at 156 F. What is this temperature on the Celsius scale? • 2- The boiling point of a chemical is 199 C. What is the temperature on a Fahrenheit scale?

  15. Conservation of mass • The total mass of the matter is the same before and after a physical or chemical change. Think about a candle: The candle lost mass when it was burned. The mass lost by the candle was combined with the gases in the air to form new substances. As a result, mass was not created or destroyed.

  16. For Next Time… • To Review: What are 5 signs that a chemical change has occurred? • Physical or Chemical Quiz • Complete Self Check Questions #1-3 pg. 609 in Science notebook. • Bring in a flash drive for Monday (one per lab group)

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