FIRST LET

1
FIRST LETS REVIEW Physical and Chemical Changes

• Physical Change

• Chemical Change

• Doesnt create a new substance
• Changes the form or shape
• Phase changes are physical changes
• Solid ? liquid ? gas
• Gas ? liquid ? solid
• Solid ? gas

• Change in matter which creates a new substance
• How can I tell if a chemical change has occurred?
• A gas is produced (bubbles)
• A change in color
• A change in temperature

2
Is the formation of rust a physical or chemical
change?
CHEMICAL
3
Is evaporation of water a physical or chemical
change?
PHYSICAL
4
Is tearing paper in strips a physical or chemical
change?
PHYSICAL
5
Are exploding firecrackers a physical or chemical
change?
CHEMICAL
6
Is burning a match a physical or chemical change?
CHEMICAL
7
Which is an example of a chemical change?

• a balloon that is blown up.
• Ice melting.
• paper burning
• a metal pan heating on the stove.

8
Which is an example of a physical change?

• Metal rusting.
• Silver tarnishing.
• Water boiling.
• Paper burning.

9
Which of the following is an example of a
physical change?

• Mixing baking soda and vinegar together, and this
  causes bubbles and foam.
• A glass cup falls from the counter and shatters
  on the ground.
• Lighting a piece of paper on fire and the paper
  burns up and leaves ashes.
• Baking a birthday cake for your mother

10
Which of the following is an example of a
chemical change?

• Filling up a balloon with hot air.
• Taking a glass of water and freezing it by
  placing it in the freezer.
• A plant collecting sunlight and turning it into
  food.
• Your dog ripping up your homework.