1. Elements, Compounds, and Mixtures
Chapter 3
Elements, Compounds, and Mixtures

2. Think About It?
Can all substances or objects be “broken down”? Explain your answer.

3. An element is…
A pure substance that cannot be broken down by physical or chemical means.

4. A pure substance is…
A substance that is made of only one kind of particle

5. Which of these is a PURE SUBSTANCE?

6. A characteristic property…
Can identify a substance
DO NOT depend on the amount of the substance

7. Examples of Characteristic Properties…
Boiling Point
Melting Point
Density
Reactivity with acid

8. Look at the characteristic properties
Look at the characteristic properties. How are these substances different?

9. Metal, Nonmetal or Metalloid?
All elements can be separated into these 3 major categories
How do we put all objects into these main groups?

10. Metals Shiny Can conduct heat and electricity
They can be formed into sheets and wire
Examples: tin, gold, copper

11. Nonmetals Dull (non-shiny) POOR conductors of heat and electricity
Solids are brittle (break easily)
Examples: iodine, sulfur, neon

12. Metalloids
These can have properties of BOTH metals and nonmetals

13. Homework
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