Physical or Chemical Properties and Change

1
Physical or Chemical Properties and Change
2
Matter

• Matter is anything that takes up space and has
  mass.
• Workbook Read pages 170-171

3
Physical or Chemical

• Matter can change in two ways physical or
  chemical.

4
Physical Properties of a Substance

• Shape
• Size
• Color
• Density
• Mass
• Volume
• Texture

• Temperature
• State of Matter
• Conductivity-( being able to conduct heat or
  electricity)
• Solubility (a substance dissolving)

5
Chemical Properties of a Substance

• Can burn (ignite or flammable)
• Can rust
• Can react with oxygen
• Can react with an acid
• Rotting
• spoiling

• Tarnishing
• Being an acid or a base (on the pH scale)
• Key words to help you know it is a chemical
  change Form, changes into

6
Physical Change

• With a physical change no new substance is
  created and the original matter can be recovered.
  Physical change does not change the composition
  of the matter. The original matter is still
  present. The substance may seem different, but
  the way the atoms are linked up are the same.

7
Physical Change

• Physical changes include
• Changing the shape or size
• Dissolving
• Changing from one state of matter to another

8
Matter

• Matter can change from one state to another by
  increasing or decreasing temperature or pressure,
  surface area, volume.

Read Workbook pages 172-173
9
Five States of Matter

• Bose-Einstein Condensates
• Solids
• Liquids
• Gases
• Plasmas

10
By adding energy the state changes.
        plasma
      energy  
      gas  
    energy    
  liquids      
energy        
solids        
11
Examples of Physical Change

• water evaporating or water changing to steam
• clothes drying in a dryer
• chopping wood - wood ground to sawdust
• erosion
• rock breaking
• mixing Kool-Aid

12
Chemical Change

• When a chemical change takes place, a new
  substance is made. The old matter is no longer
  present. The matter can not be changed back into
  its original state. The way the molecules are
  linked up is different when a chemical change
  takes place.

13
Signs of Chemical Change

• gas bubbles
• color change - leaves turning colors in the
  fall, rust appearing
• disappearance of color fading fabric
• heat or light

14
Examples of Chemical Changes

• fruit rotting, food spoiling
• rust
• decay of plants
• burning wood
• silver tarnishing
• car burning gas
• baking bread
•  

15
Practice

• Number your paper 1 10. Write chemical or
  physical for each of the following to describe
  the type of change which is taking place.

16
1. Is this a physical or chemical change?

• dirt added to a puddle of water

17
2. Is this a physical or chemical change?

• making whip cream

18
3. Is this a physical or chemical change?

• baking soda fizzes with vinegar

19
4. Is this a physical or chemical change?

• sharpening a pencil

20
5. Is this a physical or chemical change?

• a stick broken into small pieces

21
6. Is this a physical or chemical change?

• sugar turns brown, then black with heat

22
7. Is this a physical or chemical change?

• using hot water to expand a metal cup

23
8. Is this a physical or chemical change?

• freezing water

24
9. Is this a physical or chemical change?

• cornstarch turns black with iodine

25
10. Is this a physical or chemical change?

• toasting a marshmallow

26
The Answers
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1. Physical Change

• dirt added to a puddle of water

28
2. Physical Change

• making whip cream

29
3. Chemical Change

• baking soda fizzes with vinegar

30
4. Physical Change

• sharpening a pencil

31
5. Physical Change

• a stick broken into small pieces

32
6. Chemical Change

• sugar turns brown, then black with heat

33
7. Physical Change

• using hot water to expand a metal cup

34
8. Physical Change

• freezing water

35
9. Chemical Change

• cornstarch turns black with iodine

36
10. Chemical Change

• toasting a marshmallow