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Chemical and Physical Changes

Chemical and Physical Changes. 8A distinguish between physical and chemical changes in matter such as oxidation, digestions, changes in states, and stages in the rock cycle;. Physical Changes. The original substance still exists. Substance has only changed form.

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Chemical and Physical Changes

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  1. Chemical and Physical Changes 8A distinguish between physical and chemical changes in matter such as oxidation, digestions, changes in states, and stages in the rock cycle;

  2. Physical Changes • The original substance still exists. • Substance has only changed form. • Energy changes usually do not accompany physical changes, except in phase changes and when substances dissolve.

  3. Dissolving of Salt

  4. Boiling of Water

  5. Melting of Ice

  6. Bending of Wire

  7. Crushing a Rock

  8. Condensation

  9. Chemical Changes • A new substance is produced. • Energy changes always accompany chemical changes.

  10. Fireworks

  11. A Glow Worm Emits Light

  12. Burning Candle

  13. Oxidation of Apples

  14. Plant Growing

  15. Rotting of Wood

  16. Burning of Magnesium

  17. Fermenting of Grapes

  18. Tarnishing of Silver

  19. 1. In the rock cycle, which of these is a chemical change involved with the formation of igneous rocks? • Compression of sediments • Heat loss from lava • Subduction of plates • Formation of minerals

  20. 2. Which of the following is an example of a chemical change? • Ice cracking • Sugar dissolving • Milk souring • Lead melting

  21. 3. Which of these describes a pollution-producing process that involves only a physical change? • Coal with a high sulfur content is burned, producing gases that cause acid rain. • Chlorofluorocarbons are released, changing ozone in the upper atmosphere into oxygen. • Hot wastewater is discharged into a lake, lowering oxygen levels in the water. • Nitrogen oxide emissions combine with water vapor, producing nitric acid.

  22. 4. Rust (Fe2O3) forms on an iron (Fe) pipe after prolonged exposure to humid air. What type of change does this illustrate? • Mechanical • Nuclear • Chemical • Physical

  23. 5. Sheets of ice containing mostly pure water can be formed by decreasing the temperature of saltwater. Which of these best describes this change? • Chemical change • Physical change • Nuclear change • Atomic change

  24. 6. All of these represent a change in state of matter except — • melting an ice block • evaporating alcohol • sublimating dry ice • digesting a sugar cube

  25. 7. Which of these steps in the digestive process is a physical change? • Water being absorbed in the large Intestine • Enzymes breaking down proteins into amino acids • Saliva changing starches into sugars • Insulin metabolizing simple sugars

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