2. Rock, Mineral, Ore? Rock? Mixture of minerals . No fixed/specific chemical composition Mineral? Ocurring naturally in the earth. Can be mined. Has a fixed chemical composition. (Includes mineral oil). Ore? A mineral from which a metal can be obtained – economically.
6. Most ancient metal sculpture in the World Pharoah Pepi 1. (2289-2255 BC) 4300 years old. Cairo Museum, 1998 Made of copper
7. Copper Israelite copper dagger blade. Time of Abraham and Joseph. Middle Bronze Age. 2000-1570 BC
8.
9. Extracting copper from copper oxide a Transfer one spatula measure of copper(II) oxide to a hard glass test-tube. b Carefully add one spatula of charcoal powder on top of the copper oxide without any mixing. c Strongly heat these two layers for five minutes in a Bunsen flame. d Allow to cool and then look closely at where the powders meet in the test-tube. (Safety: See next slide)
10. Safety Safety spectacles must be worn. Copper (II) oxide is harmful. Avoid skin contact. Handle test tubes with a test tube holder. Stand hot test tubes in a rack. Don’t tip products down the sink at the end (Harmful to the environment). Wash your hands at the end.
11. Extracting copper from copper oxide a Transfer one spatula measure of copper(II) oxide to a hard glass test-tube. b Carefully add one spatula of charcoal powder on top of the copper oxide without any mixing. c Strongly heat these two layers for five minutes in a Bunsen flame. d Allow to cool and then look closely at where the powders meet in the test-tube.
12. Plenary In any chemical reaction: REACTANTS PRODUCTS What were the reactants? What were the products? So, what would the word equation be?
