1. Matter
What is matter?

2. Matter: What is it?
Defined as anything that has mass and takes up space.
Everything around you is made up of matter
A chocolate cake is made up of matter
You are made up of matter

3. Matter continued: Matter can be small or large
All matter is made up of atoms and molecules
Objects can be made up of different atoms
Example:
Gold is made up of Gold atoms
Salt is made up of two different atoms: sodium atoms and chloride atoms

4. Physical Properties of Matter
Any quality or condition of a substance that can be seen or measured without changing the substances identity.
For Example: color, solubility, odor, hardness, melting point, and state of matter
Remember Density is a physical property

5. States of Matter
Solid
Liquid
Gas

6. Microscopic view of a solid
Solids
Definite volume
Definite shape
Atoms are packed together if fixed positions
Strong attractive forces between atoms
Only vibrate in place

7. Microscopic view of a liquid
Liquids
Definite volume
Indefinite shape
Atoms are close together
Atoms can overcome attractive forces to flow

8. Microscopic view of a gas
Gases
Indefinite volume and shape
Atoms move very fast
Atoms are far apart
Weak attractive forces

9. Changes in Matter
Physical Change
Chemical Change

10. Physical change
change in a substance that doesn’t change the identity of the substance
Example: Includes all changes in the state of matter (physical changes of a substance from one state to another)
Grinding
cutting
Melting
boiling

11. Changes in the state of matter
deposition

12. Chemical change
a change in which a substance is converted into a different substance
same as chemical reaction
doesn’t change the amount of matter present

13. Signs of a chemical change
Energy is absorbed or given off (change in temperature)
change in color or odor
production of gas
Irreversible

14. Chemical or Physical Change?
Water boils
Salt dissolves in water
Milk spoils
A metal chair rusts
Paper is torn
A tree burns down
physical
physical
chemical
chemical
physical
chemical