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 brown Chemical 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. Answers
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.

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