Physical and Chemical Changes in Matter How to tell the difference

Matter- what is it? Defined as anything that has mass and takes up space Can be measured with tools like: Graduated cylinder Triple beam balance Ruler

Physical Change Substance may seem different, but no new substance is created!!!!

Physical Change Molecules stay the same, but move farther apart

It’s a physical change if… It changes shape or size.

It’s a physical change if… It dissolves.

It’s a physical change if... It changes phase, or state of matter.

Changing states of matter- Physical Change Heat added: More heat added: Melts Boils or Evaporates Gets even colder, Heat removed: Cools down, Heat removed: Condenses Freezes

Chemical Change Makes new substances as the result of a chemical reaction.

Chemical Change Molecules are re-arranged forming a new substance.

Molecules are re-arranged forming a new substance. Chemical Change Molecules are re-arranged forming a new substance.

It’s a chemical change if…. It burns.

It’s a chemical change if…. Temperature changes without heating/cooling.

It’s a chemical change if... It bubbles (makes a gas).

It’s a chemical change if... It changes color.

It’s a chemical change if... It forms a precipitate (unexpected formation of a solid).

It’s a chemical change if... Change in odor or smell.

Put Your Notes Away…

Ralley Round Table It burns It changes temperature List the evidence for a chemical reaction Hint… there are 6. It burns It changes temperature It bubbles (a gas forms) It changes color A precipitate forms Change in odor or smell