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 the way the atoms link up is the same.

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 Changes the way the molecules link up. Makes new substances.

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