MatterStates of Matter

Changes in matter

States of Matter0 Solid0 Liquid 0 Gas

Solids0 Definite volume0 Definite shape0 Atoms are packed together if fixed positions0 Strong attractive forces between atoms0 Only vibrate in place

Microscopic view of a

solid

Liquids0 Definite volume0 Indefinite shape0 Atoms are close together0 Atoms can overcome attractive forces to flow

Microscopic view of a

liquid

Gases0 Indefinite volume and shape0 Atoms move very fast0 Atoms are far apart0 Weak attractive forces

Microscopic view of a gas

Changes in Matter

Physical Change

Chemical Change

Physical change0 change in a substance that doesn’t change the identity of the

substance

0 Example: Includes all changes in the state of matter (physical changes of a substance from one state to another)

0 Grinding0 cutting0 Melting0 boiling

Changes in the state of matter

depositio

n

Chemical change0 a change in which a substance is converted into a different

substance

0 same as chemical reaction

0 doesn’t change the amount of matter present

Signs of a chemical change0 Energy is absorbed or given off (change in temperature)0 change in color or odor0 production of gas0 Irreversible

Chemical or Physical Change?0 Water boils0 Salt dissolves in water0 Milk spoils0 A metal chair rusts0 Paper is torn0 A tree burns down

physical

physicalchemical

chemical

physicalchemical