Chapter 19 In case you missed it

1
Chapter 19- In case you missed it

• Physical Properties
• Chemical Properties
• Physical Change
• Chemical Change
• Conservation of Mass

2
Physical Properties

• A characteristic you can observe without changing
  the substance.
• Using your senses
• State
• Size Dependent properties (mass, weight, volume)
• Size Independent properties-density,
  melting/boiling point, solubility, ability to
  attract a magnet, state of matter, color

3
Chemical Properties

• A characteristic that cannot be observed without
  altering the substance.

4
Physical Changes

• The form or appearance of matter changes, but not
  its composition.
• Changing shape
• Dissolving
• Changing state
• Meltingsolid to liquid
• Freezingliquid to solid
• Vaporizationliquid to gas
• Sublimationsolid to gas
• Depositiongas to solid

5
Chemical Changes

• Substances are changed into different substances
• Key words burn, rust, tarnish, digest, rot,
  bakeetc
• Signs of chemical changes- unexpected change of
  color, energy absorbed or released (heat, cold,
  light, fire), change in odor, gas or solid is
  produced, not easily reversed

6
Conservation of Mass

• Antoine Lavoisier
• The particles within the matter can be rearranged
  to form new substances, but they are not
  destroyed and new particles are not created.
• Mass before reaction equals mass after reaction
  of a closed system