1. Chapter 1.3 Physical and Chemical Changes and Properties
Chemistry
Objectives S4:1&2 and S5

2. Essential Questions What are the different states of matter?
How can you tell if something is a intensive or extensive property?
How can you tell if something is a physical or chemical property?
How can you tell if something is a chemical or physical change?
What are the 4 indications of a chemical change?

3. Matter Matter is anything that has mass and volume
Matter generally has 3 states or phases:
Solid: Has both definite shape and volume
Liquid: Has a definite volume but no definite shape
Gas: Has no definite shape or volume

4. Particle Arrangements
Gas particles have no regular arrangement and move/vibrate freely
Liquid particles are close together with no regular arrangement and can vibrate and slide past each other
Solid particles are tightly packed (usually in a regular pattern) and vibrate only.
Gases, Liquids, and Solids

5. Density Different states have different densities.
For most substances, its density will increase as you go from gas to liquid to solid.

6. Changes of state By heating or cooling matter, we see changes in state
Evaporating/Condensing- between liquids and gases
Melting/freezing-between liquids and solids
Sublimation-from a solid to a gas

7. Properties
A property is a trait and all properties are either intensive or extensive
An extensive property depends on the amount of matter in a sample.
Mass and volume
An intensive property depends only on the type of matter and not on the amount of matter.
Hardness and density

8. Properties of Matter
PHYSICAL PROPERTY- observed w/o altering the substances identity
Examples of physical properties are:
Color
Density
Texture
Melting point and boiling point

9. Properties of Matter
CHEMICAL PROPERTY- only observed when substance changes identity
Some examples are:
Reactivity
Combustibility
Rusting

10. Changes in Matter
PHYSICAL CHANGE- does not alter the identity of a substance
State changes, changes in amount or size
CHEMICAL CHANGE-alter the identity of a substance
The substance becomes a chemically different substance
a.k.a. a CHEMICAL REACTION

11. Four indications of a chemical change reaction
a transfer of energy (light and heat)
An unexpected color change
the production of a gas
the formation of a precipitate (solid).

12. Chemical Changes
A magnet separates iron from sulfur. This is an example of a physical change.
A mixture of iron filings and sulfur can be changed. a) A magnet separates the iron from the sulfur. b) Heat combines iron and sulfur in a compound. Classifying Which change is a chemical change? Explain.

13. Chemical Changes
A mixture of iron and sulfur is heated. The iron and sulfur react and form iron sulfide. This is an example of a chemical change.
A mixture of iron filings and sulfur can be changed. a) A magnet separates the iron from the sulfur. b) Heat combines iron and sulfur in a compound. Classifying Which change is a chemical change? Explain.

14. Essential Questions What are the different states of matter?
How can you tell if something is a intensive or extensive property?
How can you tell if something is a physical or chemical property?
How can you tell if something is a chemical or physical change?
What are the 4 indications of a chemical change?

15. 1.3 Tracked Assignment P 42 #1-3, 7-8 P 55 #28-29, 31-32