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Physical and Chemical Changes

Physical and Chemical Changes. Physical Changes. No new substance is formed Indicators: size and shape change, phase change, mixture, dissolving. Chemical Changes. New substance formed from original substances that lose their original properties.

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Physical and Chemical Changes

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  1. Physical and Chemical Changes

  2. Physical Changes • No new substance is formed • Indicators: size and shape change, phase change, mixture, dissolving

  3. Chemical Changes • New substance formed from original substances that lose their original properties Hydrogen is a flammable gas that combines with…

  4. Oxygen to produce… A gas that is essential for life and for combustion to occur.

  5. the compound water which is a colorless liquid that is not flammable and doesn’t support combustion

  6. Indicators of a chemical change: • Produce gas • Produce heat and light

  7. More indicators of a chemical change include Burning • Producing a solid • Temperature change • Oxidation • Odor Oxidation Rusting

  8. and also a color change may indicate a chemical change

  9. Physical or Chemical • Get ready to decide if the following examples are chemical changes or physical changes.

  10. Example 1- chemical or physical change? Raindrops become snowflakes

  11. Example 2-Apple starts to turn brownChemical or Physical Change?

  12. Example 3- Chemical or Physical Change? Alkaseltzer tablet in water

  13. Example 4-Bicycle rusts

  14. Example 5- Butter melts –Chemical or Physical?

  15. Example 6-Chemical or Physical • Acid on limestone White Cliffs of Dover chalk

  16. Example 7-Chemical or Physical Change? Cream is whipped

  17. Example 8-Chemical or Physical Change? Dynamite Explodes

  18. Example 9-Chemical or Physical Change? Cell phone battery

  19. Example 10-Chemical or Physical Change? Lemonade powder is mixed into water

  20. 1-Physical-Raindrops become water. Substance is still water. Went through phase change of liquid to solid 2-Chemical-Apple turns brown is evidence of a color change 3-Chemical-Alkaseltzer in water produces a gas called carbon dioxide. There is also a temp. change 4-Chemical-Bicycle rusting is oxidation because the metal united with oxygen in the air. Answers

  21. More Answers • 5-Physical-Butter melting is a phase change from a solid butter pat to a liquid. • 6-Chemical-Acid on limestone produces a gas • 7-Physical-Cream is whipped. This is a mixture of air and cream. • 8-Chemical-dynamite explodes and produces heat and light. • 9-Chemical-Cell phone battery produces heat and light • 10-Physical-Lemonade powder mixes and dissolves in water.

  22. Girls Only- Guess These • Chemical or Physical • 1. Fireworks explode • 2.Grass is mowed • 3.Hair is bleached • 4.Iron gets magnetized • 5.Ice cream melts

  23. Boys Only-Guess These • Chemical or Physical change? • 1.Jello hardens in the fridge • 2.Your lunch digests • 3.Lightening bug glows • 4.Log decomposes • 5.Pine bark is made into mulch

  24. Who was the best?

  25. Answers • Girls • 1-C • 2-P • 3-C • 4-P • 5-P • Boys • 1.-P • 2.-C • 3.-C • 4.-C • 5.-P

  26. The End

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