1. Unit 2 Concepts of Matter
C.4.A differentiate between physical and chemical changes and properties

2. Table of Contents Slide 3 Definition of Matter and Substance
Slides 4 & 5 Physical Properties
Slide 6 Chemical Properties
Slide 7 Physical Change
Slide 8 & 9 Chemical Change
Slides 10 – 15 States of Matter

3. Matter Matter is defined as anything that has mass and takes up space
chemists use characteristic properties to tell substances apart and to separate them
a substance is matter that has a uniform and definite composition

4. Physical Property
Any quality or condition of a substance that can be observed or measured without changing the substances identity.
Physical properties can be classified as Intensive and Extensive properties.

5. Identify Intensive and Extensive Properties
Intensive Property is a physical property of the system that does not depend on the system size or the amount of material in the system.
Examples of intensive properties include: * temperature * viscosity * density * electrical resistivity * melting point * boiling point * pressure * spectral absorption maxima (in solution) * flammability
Extensive Property an extensive property of a system does depend on the system size or the amount of material in the system.
Examples of extensive properties include: * mass * volume * entropy * energy * electrical resistance * texture * heat

6. Chemical Properties
Chemical Property is how a substance reacts in the presence of:
Air
Acids
Water
Bases
Chemicals
Chemical Property is also, how does the substance reacts when it is heated?

7. Physical Changes in Matter
Ex. grinding, cutting, melting, boiling
change in a substance that doesn’t change the identity of the substance
Includes all changes of state (physical changes of a substance from one state to another)

8. Chemical Changes in Matter
Chemical Change is a change in which a substance is converted into a different substance
doesn’t change the amount of matter present
reactants – substances that react
products – substances that form

9. Signs of Chemical Change
Energy is always absorbed or given off
Change in color or odor
Production of a gas
Irreversibility

10. States of Matter
Solid
Liquid
Gas

11. Particle Movement In Matter
Solids Liquids Gases

12. Solid definite volume definite shape
atoms are packed together in fixed positions
only vibrate in place
Not easily compressible little free space between particles

13. Liquid definite volume indefinite shape atoms are close together
not easily compressible little free space between particles

14. Gases indefinite volume and shape atoms move quickly
atoms are far apart
compressible lots of free space between particles
vapor refers to the gaseous state of a substance that is a solid or liquid at room temperature.

15. Is It Chemical or Physical Change?
Cookies are baked
Water boils
Salt dissolves in water
Milk spoils
A metal chair rusts
Paper is torn
A tree burns down