Presentation Transcript
Physical and Chemical Changes :How to tell the difference Physical and Chemical Changes
Physical Change :Physical Change Substance may seem different, but the way the atoms link up is the same.
It’s a physical change if :It’s a physical change if It changes shape or size
It dissolves.
Slide 4:It changes phase (freezes, boils, evaporates, condenses) It’s a physical change if...
Chemical Change :Changes the way the molecules link up
Makes new substances Chemical Change
Here are some other examples of chemical reactions: :Here are some other examples of chemical reactions: raw egg becomes cooked egg
cake mix becomes cake
It’s a chemical change if…. :It’s a chemical change if…. It burns
Temperature changes without heating/cooling
It’s a chemical change if... :It’s a chemical change if... It bubbles (makes a gas)
It’s a chemical change if... :It’s a chemical change if... It changes color
It forms a precipitate
What kind of change is it if someone... :What kind of change is it if someone... Tears up paper?
Physical change
Mixes salt and water?
Physical change
What kind of change is it if someone... :What kind of change is it if someone... Burns paper?
Chemical change
Evaporates salt water?
Physical change
What kind of change is it if someone... :What kind of change is it if someone... Mixes vinegar and baking soda?
Chemical change