1. Describing Matter
Chapter 2 Section 1

2. What is Matter? What is a Substance?

3. Properties of Matter
Substance: Single kind of pure matter with a specific makeup and set of properties.
1. Physical Property:
Characteristic of a pure substance that can be OBSERVED without changing it into another substance.
Helps you identify/classify/describe matter
ie: Density, hardness, texture & color

4. What are some Physical Properties?

5. 2. Chemical Properties
Characteristic of a pure substance that describes its ability to change into different substances because of its composition.
CAN’T be observed by looking or touching
ie:
a. IRON reacts with oxygen to form RUST… a completely different/new substance.
b. SILVER reacts with sulfur in the air to form TARNISH.

6. What was the substance before and what did it become?
Burning produces new products…heat, gas and ashes

7. BRAIN BREAK!
Stand up, stretch your arms, turn to your partner, and tell him/her what a Substance is. Then, let him/her tell you the Difference between Physical and Chemical Properties. Then, stretch your arms again and take your seat.

9. Elements Element: The SIMPLEST substance.
A substance that cannot be broken down into any other substance by chemical or physical means.
Can be identified by its specific physical and chemical properties.
Atoms:
Basic particle of all elements. Different elements are made of different atoms.
Chemical Bond:
When atoms combine…they form molecules

10. Compounds
A pure substance made of two or more elements chemically combined in a set ratio
Can be represented by a Chemical Formula
When elements combine to form compounds, they have properties that are different from those of the uncombined elements.
For example:
Carbon Dioxide = CO2
Glucose = C6H12O6

11. Snail Shell is composed of Calcium Carbonate = Calcium, Carbon and Oxygen

13. Mixtures 1. Heterogenous Mixture= You can see the different parts
Made of two or more substances
“Mixed together” but NOT Chemically Combined
Each substance in the mixture retains original properties
1. Heterogenous Mixture= You can see the different parts
2. Homogenous Mixture= So evenly mixed that you can’t see the different parts
a. Solution = Type of Homogenous Mixture

14. Heterogeneous = Not uniform composition Parts can be mechanically separated Homogenous = Uniform composition Parts cannot be mechanically separated