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Physical and Chemical Changes

Physical and Chemical Changes. NEENA HARIDAS Physical Science Reg. No: 13971014. Objective :. To study the difference between a physical and chemical change. Matter. Matter is everywhere. Matter is anything that takes up space and has mass.

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Physical and Chemical Changes

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  1. Physical and Chemical Changes NEENA HARIDAS Physical Science Reg. No: 13971014

  2. Objective: • To study the difference between a physical and chemical change.

  3. Matter • Matter is everywhere. • Matter is anything that takes up space and has mass. • Matter is constantly experiencing both chemical and physical changes.

  4. Physicalchange • A physical change alters the form of a substance, but does not change it to another substance. • It changes shape or size • It dissolves. • It changes phase (freezes, boils, evaporates, condenses) • Example: Making Orange Juice

  5. Physical changes occur when matter changes its property but not its chemical nature. • Physical property changes could include a change in: texture, shape, size, color, odor, volume, mass, weight, and density.

  6. Crushing an aspirin • A Boiled egg Physical Change

  7. Physical Change • Cutting paper?

  8. Ice melting? • Physical Change

  9. Sawing wood? • Physical Change

  10. Disappearing puddle? • Physical Change

  11. Physical Change Dry ice?

  12. Chemical Change • Chemical changes are changes matter undergoes when it becomes new or different matter. • It burns • Temperature changes without heating/cooling • It bubbles (makes a gas) • It changes color • It forms a precipitate

  13. When a substance undergoes a chemical change, it is changed into a different substance with different properties. • To identify a chemical change look for signs such as color change, bubbling and fizzing, light production, smoke, and presence of heat. • Example: Baking a Cake

  14. Signs of a Chemical Change • Precipitation 2. Color Change

  15. 3. Gas Production 4. Temperature Change

  16. A chemical change occurs when fireworks are used. Fireworks are made of metals such as magnesium and copper. These change chemically as they light up the sky.

  17. Lighter fluid burining Chemical Change

  18. Examples for Chemical Change • Baking soda added to water • Logs burning • Breaking water up by separating it into hydrogen and oxygen

  19. Toast burning? • Chemical Change

  20. Rocket fuel burning? • Chemical • Change

  21. Metal rusting? Chemical Change

  22. Candle burning? • Chemical Change

  23. Identify the Change? • Tears up paper? Physical change • Mixes salt and water? Physical change • Burns paper? Chemical change • Evaporates salt water? Physical change • Mixes vinegar and baking soda? Chemical change

  24. Writing Activity • Write a paragraph about the difference between a chemical and physical change. Give examples of each.

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