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Changing Matter

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Physical & Chemical Changes Two basic types of properties that we can associate with matter. Physical properties Chemical properties Matter has properties Anything ... – PowerPoint PPT presentation

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Title: Changing Matter


1
Changing Matter
  • Physical Chemical Changes

2
Matter has properties
  • Two basic types of properties that we can
    associate with matter.
  • Physical properties
  • Chemical properties

3
Physical Properties
  • Anything that can be observed without changing
    the identity of the substance. (Tends to be
    measurable.)
  • melting point
  • boiling point
  • electrical conductivity
  • color
  • density
  • thermal conductivity
  • ductility
  • malleability

4
Chemical Properties
  • The way a substance may change or react to form
    other substances
  • heat of combustion
  • reactivity with water
  • PH
  • Oxidation
  • Flammability
  • Reactivity to other chemicals

5
Matter can be changed two ways
  • Physically
  • Physical reaction
  • Physical change
  • Chemically
  • Chemical reaction
  • Chemical change

6
Physical Changes
  • Do NOT CHANGE THE TYPE OF MATTER
  • Nothing new or different is formed
  • Could be a change in
  • Mass
  • Volume
  • Density
  • Change in state
  • Color
  • Shape

Size
7
Examples of Physical Changes
  • Boiling
  • Freezing
  • Dissolving
  • Breaking
  • Making a mixture
  • 2 or more types of matter (substances) mixed
    together
  • Not in specific amounts
  • Can be separated physically

8
Chemical Changes
  • The composition of the substance changes.
  • The substances present at the beginning of the
    change are not present at the end new substances
    are formed. The change cannot be undone.

Picture from www.chem4kids.com
9
Chemical Changes
  • Evidence of a chemical reaction
  • Formation of gas
  • Formation of precipitate
  • Change in color
  • Change in energy
  • Endothermic Absorbs heat energy (gets cold)
  • Exothermic Releases heat energy (gets hot)

10
Chemical Changes
  • Atoms are re-arranged, NOT created or destroyed

11
Law of Conservation of Matter
  • Matter and Mass is conserved ? type of atoms does
    not change
  • Nothing is created or destroyed

12
What kind of change is it if..
  • Tears up paper?

13
What kind of change is it if
  • Burn paper

14
What kind of change is it if..
  • Mix salt and water

15
What kind of change is it if
  • Mix vinegar and baking soda?
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