C. Classify as to what type of change each system belongs: (choices: physical ch

Question

C. Classify as to what type of change each system belongs:

   (choices: physical change or   chemical change)

1. Formation of frost                      Ans._

2. Decaying of fruits                        Ans._

3. Ozone layer depletion              Ans._

4. Souring of milk                             Ans._

5. Bomb explosion                           Ans._

6. Decomposition of blood           Ans._

7. Shattering of the glass              Ans._

8. Tearing of clothes                       Ans._

9. Magnetization of iron nails      Ans._

10. Fermentation of wine             Ans._

Explanation / Answer

1. physical change: frost; changes from water to ice
2. chemical change: gas is released resulting to bad odor :-&
3. chemical change: harmful gasses breakdown O3 or ozone
4. chemical change: formation of precipitate or curds
5. chemical change: trigger; having something trigger an explosion. releases light and heat
6. chemical change: significant change in color
7. physical change: only one glass breakdown to many nothing changes
8. physical change: only tears no change too
9. physical change: no change:)
10. chemical change: significant change in taste:)

here are some factors to know whether it is physical or chemical change:
1. significant change in color and/or taste. *
2. precipitate is formed.
3. gas produced; evolution or bubbles formed.
4. energy is absorbed or released to light, heat and/or sound.

* and by significant change i mean, THE COLOR CHANGES NOT JUST THE HUE

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