CHAPTER 9:CLASSSIFYING

MATTERTypes of changes in matter

Part 2

TYPES OF CHANGES IN MATTER

Physical change

(Reversible)

Chemical change

(Irreversible)

PHYSICAL CHANGE (REVERSIBLE) Is a change that does not result in a new

substance. Examples:a)Changes in states of matter. Ice to water to vapor

b)Cutting a piece of paper.

c)Dissolving sugar or salt in water.

CHEMICAL CHANGE(IRREVERSIBLE) Is a change that results in one or more

new substance. Examples:a)Burning a piece of wood.

b)Iron rusting.

c)Bread dough baking.

EVIDENCE THAT A CHEMICAL CHANGE HAS HAPPENED(IRREVERSIBLE)1)Change in colour .Example: Iron rust.

2)Change in scent . ( odour )3)The presence of bubbling or fizzing.

4)Heat is released or absorbed.