1. Introduction to Chemistry
Chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
Matter - anything that takes up space and has mass
There are different kinds of matter. Each different kind of matter has different properties

2. Physical Property of Matter: a characteristic or description of a substance that can be used to identify it.
Examples: State of matter (liquid, gas, solid)
Hardness
Malleability - (how easy to bend)
Ductility - (how easy to stretch)
Melting/Boiling Point
Crystal Form
Solubility in Water
Viscosity
Density

3. Chemical Property of Matter: a characteristic or behavior that occurs when one substance interacts with another to create a new substance
Examples: Combustibility/Flammability
Reaction with acids

4. Gold is very dense. This is an example of one of its ______________ properties
Physical
Chemical 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

5. Sugar can easily dissolve in water
Sugar can easily dissolve in water. This is an example of its ______________ properties
Physical
Chemical 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

6. Hydrogen gas is explosive. This is one of its ____________ properties
Physical
Chemical 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

7. Physical Changes
A change that does not alter the chemical composition of a material
A change in which no new substance is formed
Hints
1. Usually reversible
2. Don’t involve changes in color or odor
3. Cutting, grinding, bending, melting, freezing, breaking, cracking, disolving

8. VAPOR O H H
WATER O H H
ICE O H H

9. Chemical Changes
A change that produces new substances with new properties
Hints
1. Energy is absorbed or given off
2. Changes in color or odor
3. Production of gas or solid from liquid
4. Not easily reversible
5. burn, rust, ferment, rot, decompose, explode

10. Reactants and Products
In a chemical change, the particles you start with are different than the particles you end with
The particle you have before the reaction are called reactants
The particle you have after the reaction are called Products

11. Hydrogen Gas Molecule
Oxygen Gas Molecule
Energy is absorbed
Gas from liquid
Water molecule

12. Which of the following is a chemical change?
Ice melting into water
Sugar dissolving into water
Hydrogen burning and turning to water
2 and 3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

13. Q2. Which of the following is not a physical property..
smell
solubility
viscosity
They all are 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

14. In a cars engine gasoline combusts and turns into CO2
In a cars engine gasoline combusts and turns into CO2. this is a ___________________ change
Chemical
Physical
both 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

15. Physical or Chemical A. garbage rotting (decomposition) -
B. cutting up carrots –
C. A silver spoon turning black –
D. Making tea from tea leaves –
E. Bleaching a stain –
F. Boiling an egg -
CHEMICAL (new substance) (odor change)
PHYSICAL (still carrots)
CHEMICAL (color change)
PHYSICAL (still tea just dissolved)
CHEMICAL (color change)
CHEMICAL (not reversible)