1. Elements from earth Section 1.4

2. Turn in lab questions from text!

3. Useful elements removed from Earth’s surface
Gold
Copper
Iron

4. Gold
Panning
Density
Fools gold
Gold
Pyrite, “fool’s gold”

5. Copper and Electrolysis
Most elements in nature are found as compounds
Most copper found in ores.
Ores are rocks that contain metal or other economically useful material.
In order to separate compounds, a chemical reaction must occur
Electrolysis is often used to break apart copper compounds
First, dissolve compound/ore in water to get a solution
Next, run an electric current through electrodes (metal strips) in the solution. This will cause copper to attract to one electrode and the other material to attract to the other electrode.

6. Iron and Blast Furnace
Iron also typically found in an ore in a compound of iron and oxygen
To separate the iron, the ore is placed in a hot fire along with coke, a source of carbon. The carbon and oxygen react with each other, leaving iron behind.
It is common to mix iron with other elements to get desired characteristics
Ex Iron + Carbon= Steel (stronger than iron alone)
Iron+Chromium+Nickle=Stainles s Steel (resists rust)

7. Big Ideas
How do we extract gold, copper and iron from the Earth?

8. Vocabulary
electrolysis
electrode

9. Task Make a poster of the following common elements:
H, He, C, N, O, Na, Mg, Al, Si, P, S, Cl, K, Ca, Fe, Cu, Zn, Br, Hg, Sn, Pb, and U.
Include the element name, symbol and one interesting fact such as its importance, use or properties.
You will need to memorize these for the test!