1. Describing Matter Chapter 2 Section 1 Structure of Matter
Students know that compounds are formed by combining two or more different elements and that compounds have properties that are different from their constituent elements.

2. Properties of Matter Matter Anything that has mass and takes up space
Substance
Single kind of pure matter with a specific makeup and set of properties.
cannot be separated by physical or mechanical means
it has uniform composition
its properties are constant
Physical Property
Characteristic of a pure substance that can be observed without changing it into another substance.
Helps you identify/classify/describe matter
ex: density, hardness, texture & color

3. What is Matter? What is a Substance?

4. Chemical Properties
Chemical Properties Characteristic of a pure substance that describes its ability to change into different substances because of its composition Cannot be observed by looking or touching Examples a. Iron reacts with oxygen to form rust a completely different/new substance. b. Silver reacts with sulfur in air to form tarnish again, a new substance!

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

6. 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

7. Compounds

8. 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

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

10. Common Compounds

11. Mixtures Made of two or more substances
“Mixed together” but NOT chemically combined
Each substance in the mixture retains original properties
Homogenous Mixture =
Evenly mixed, you can’t see the different parts
(Solution = Type of Homogenous Mixture)
Heterogeneous Mixture =
You can see the different parts

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

14. Test Your Knowledge