Bellringer

1
Bellringer

• Identify the changes as
• PHYSICAL (P) OR CHEMCIAL (C)
• in the BEFORE column

2
Learning Target

• I can distinguish between a physical and chemical
  change. This means I know what physical changes
  and chemical changes are and I can tell the
  difference between them.

3
Characteristics of Physical Changes

• A change in physical properties
• Change the form or appearance of the substance
• A new substance is NOT formed
• You can often reverse it

4
Examples of Physical Changes

• Cutting
• Change in shape
• Dissolving
• Consider dissolving sugar in lemonade, though you
  can no longer see the sugar, you know it hasnt
  changed because you can still taste it!

5
Examples of Physical Change

• Any change in state
• Melting solid to liquid
• Boiling liquid to gas
• Condensation gas to liquid
• Freezing liquid to solid
• Sublimation solid to gas
• Deposition gas to solid

6
Changes of State

• Matter is made up of moving particles
• The state of matter is determined by how much
  energy the particles have
• Draw a picture of what the particles look like in
  a solid, liquid, and gas.

7
Changes of State

• Solids
• Particles are close together and only
  vibrate
• Liquids
• Particles move faster and slide past
  each other
• Gas
• Particles move quickly and far apart

8
Changes of State

• Particles of matter move faster or slow down as
  temperature changes and so the state changes!

9
More about state changes.

• BrainPop

10
Illustrating Physical Changes

• Lets illustrate some physical changes!
• Consider what the particles are doing during the
  change!
• First, lets do one together!
• Cutting paper
• Melting ice
• Evaporating water
• Mixing salt and water
• Molding playdough