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Matter: Physical and Chemical Changes Part 2

Matter: Physical and Chemical Changes Part 2. Physical Change. Physical changes occur when matter changes its property but not its chemical nature. Physical changes could include a change in: texture, shape, size, color, odor, volume, mass, weight, and density . Physical Change.

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Matter: Physical and Chemical Changes Part 2

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  1. Matter: Physical and Chemical Changes Part 2

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

  3. Physical Change Remember! • properties remain the same • reversible • can be used to separate mixtures

  4. Physical Change

  5. Chemical Change • Chemical changes are changes matter undergoes when it becomes new or different matter. • To identify a chemical change look for signs such as color change, bubbling and fizzing, light production, smoke, and presence of heat.

  6. C. Chemical Change Remember! • properties change • irreversible • Signs: color change, formation of a gas/solid, release of light/heat

  7. Chemical Change • 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.

  8. Density • Densitydescribes how much mass is in a given volume of a material.

  9. Density • Solids, liquids and gases are matter, so they all have density.

  10. Determining Density • To find the density of a material, you need to know the mass and volume of a solid sample of the material. • Mass is measured with a balance or scale. • Use the displacement method or calculate the volume.

  11. Density Problems

  12. Mass 1. 500g 2. 300g 3. 25g Volume 50ml 15ml 5cm3 What is my Density? Complete the following questions on a separate sheet of paper as a part of your homework assignment.

  13. Quiz Yourself • Go through the following slides to quiz your knowledge of physical and chemical changes. • Remember there is a quiz tomorrow!

  14. Is it a chemical or physical change? • Sugar dissolving in tea • Chemical Change • Physical Change

  15. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  16. Correct!

  17. Is it a chemical or physical change? • Logs burning • Chemical Change • Physical Change

  18. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  19. Correct!

  20. Is it a chemical or physical change? • Breaking water up by separating it into hydrogen and oxygen • Chemical Change • Physical Change

  21. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  22. Correct!

  23. Is it a chemical or physical change? • Cutting paper • Chemical Change • Physical Change

  24. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  25. Correct!

  26. Is it a chemical or physical change? • Crushing an aspirin • Chemical Change • Physical Change

  27. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  28. Correct!

  29. Is it a chemical or physical change? • Metal rusting • Chemical Change • Physical Change

  30. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  31. Correct!

  32. Is it a chemical or physical change? • Lighter fluid burining • Chemical Change • Physical Change

  33. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  34. Correct!

  35. Is it a chemical or physical change? • An egg rotting • Chemical Change • Physical Change

  36. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  37. Correct!

  38. Is it a chemical or physical change? • An egg breaking • Chemical Change • Physical Change

  39. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  40. Correct!

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