2. I- The Elements: A- Substances that form all matter. 1- Elements are pure substances that can not be broken down by heat, light, or electricity.

3. 2- Elements contain only one type of atom. With the properties of that element. 3- Your body contains elements the most abundant being Oxygen, Hydrogen, Carbon, Calcium, Phosphorus, and Nitrogen.

4. B- D DD Discovering the Elements : 1- Their are over 109 elements, 90 of them are found in nature. 2- In ancient times the people thought their were only 9 elements. 3- Marie & Pierre Curie discovered Radium and Polonium in 1898.

5. C- C CC Chemical Symbols 1- Is a shorthand form of the element’s name. 2- It always starts with a Capital letter. Helium’s =He, Cobalt’s = Co, Oxygen = O. 3- Some elements come from their Latin names for e ee example gold = Au aurum lead = Pb plumbum

6. D- Describing Elements: Scientist group elements according to their properties. 1- Most elements are m mm metals or m etallic elements. a- L LL Luster = Shiny. b- D DD Ductile = can be drawn (made ) into a wire.

7. c- c- Malleable Malleable = can be hammered, rolled, or shaped without breaking. (jewelry) d- d- Solid at room temperature. e- e- Conduct heat well.

8. 2- 2- Nonmetals Nonmetals or nonmetallic have properties that are opposite of metals. 3- 3- Metalloids Metalloids have properties of metals and nonmetals. Germanium, Germanium, Arsenic, Arsenic, and Silicon Silicon used in computers.

9. II- II- Physical Physical Properties Properties : make a substance identifiable identifiable. A- A- Examples = 1- taste 2- odor 3- hardness 4- color 5- density 6- magnetic 7- boiling & melting point

10. B- B- Physical Change Change : is any change that does not not alter {change} the chemical make-up of a substance. 1- 1- Examples= Examples= Dissolving, evaporating, heating, cooling, size, shape, or phase.

11. Ice melting Dissolving Evaporating Freezing

12. III- III- Chemical Chemical Properties Properties : Describes how two substances react with each other. A-Producing A-Producing Chemical Changes Changes : Rust and tarnish are new materials with new properties both result from a chemical change.

13. 1- 1- After a chemical change the properties of the original substance is no longer present. Rust Tarnish