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Chemical and Physical Changes Physical Changes Only changes physical properties, does not become a new substance (usually reversible). Only changes physical.

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Presentation on theme: "Chemical and Physical Changes Physical Changes Only changes physical properties, does not become a new substance (usually reversible). Only changes physical."— Presentation transcript:

1

2 Chemical and Physical Changes

3 Physical Changes Only changes physical properties, does not become a new substance (usually reversible). Only changes physical properties, does not become a new substance (usually reversible). –Phase changes –Dissolving –Breaking

4 Chemical Changes When 1 or more substances form a new substance. When 1 or more substances form a new substance. Evidence: Evidence: –Production of a gas (not phase change) –Formation of a precipitate –Change in color –Change in temperature (without heat being added or taken heat being added or taken away) away) –Emission of light or odor

5 Is it a chemical or physical change? Sugar dissolving in tea Sugar dissolving in tea Chemical Change Physical Change

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

7 Correct!

8 Is it a chemical or physical change? Logs burning Logs burning Chemical Change Physical ChangePhysical Change

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

10 Correct!

11 Is it a chemical or physical change? Cutting paper Cutting paper Chemical Change Physical Change

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

13 Correct!

14 Is it a chemical or physical change? Crushing an aspirin Crushing an aspirin 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? Metal rusting Metal rusting 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? Lighter fluid burning Lighter fluid burning 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? An egg rotting An egg rotting 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? An egg breaking An egg breaking 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 Law of Conservation of Mass No matter what change occurs: No matter what change occurs: mass before = mass after mass before = mass after # of atoms before = # of atoms after

30 Images Cited http://www.learner.org/channel/courses/e ssential/physicalsci/session4/closer1.html http://www.learner.org/channel/courses/e ssential/physicalsci/session4/closer1.html http://www.learner.org/channel/courses/e ssential/physicalsci/session4/closer1.html http://www.learner.org/channel/courses/e ssential/physicalsci/session4/closer1.html http://www.hcbe.net/itc/powerpoints/scie nce/files/CF61DBA93ED44B4B8A5C75E1A 1AEB2CC.ppt http://www.hcbe.net/itc/powerpoints/scie nce/files/CF61DBA93ED44B4B8A5C75E1A 1AEB2CC.ppt http://www.hcbe.net/itc/powerpoints/scie nce/files/CF61DBA93ED44B4B8A5C75E1A 1AEB2CC.ppt http://www.hcbe.net/itc/powerpoints/scie nce/files/CF61DBA93ED44B4B8A5C75E1A 1AEB2CC.ppt

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