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Earth’s Mineral Resources

Earth’s Mineral Resources. Unit 2 Sect B Environmental Chemistry. Coin-Design Competition. One requirement for the new coin is to specify the coin’s material/composition We have studied the elements Where are the elements located on Earth?

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Earth’s Mineral Resources

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  1. Earth’s Mineral Resources Unit 2 Sect B Environmental Chemistry

  2. Coin-Design Competition • One requirement for the new coin is to specify the coin’s material/composition • We have studied the elements • Where are the elements located on Earth? • First a little background about the earth’s structure

  3. Cross Section of the Earth

  4. Cross Section of Earth • Earth can be divided into 3 main layers based on the materials that make up those layers • _____ -- _______ • Continental Inner • Oceanic Outer • _______ • Lithosphere • Asthenosphere • Mesosphere

  5. Earth’s Crust • Rocky outer layer of earth is the crust • Thin compared to other layers • Mostly made of ___________ (elements silicon and oxygen), aluminum, iron, calcium

  6. Two Types of Earth Crust • Continental crust: the rock that makes up the earth’s continents • Averages 40 km thick • Oceanic crust: rock that makes up ocean floor • Averages 7 km thick

  7. The Mantle • Earth’s mantle: thick layer of solid rock below earth’s crust • About 2850 km thick • Mostly made of _____________ • More dense than crust • Pressure and temperature increases as you get deep inside the earth

  8. Three Layers of Mantle • Lithosphere: ____________ part of mantle • Cool, rigid rock • Asthenosphere: middle part of mantle • Softer, weak layer, flows like taffy • Mesosphere: bottom part of mantle • Strong and stiff rock layer

  9. The Core • The core is a large sphere of metal that occupies Earth’s center • Mostly made of _______(allows for earth’s magnetic field) • Very high pressure! Almost 3.6 million times that of earth’s surface • Temperature: about 5500oC • Outer core: liquid metal (high temp) • Inner core: solid metal (high pressure)

  10. Study Buddy Review • What are the three main layers of the Earth? • What happens to the temperature and the pressure as you descend into the Earth? • Which metal is in the core of the Earth? Why is that important?

  11. Sources and Uses of Metals

  12. Sources of Elements on Earth • Atmosphere: _______________________ • Hydrosphere: water components of the earth’s surface • Lithosphere: solid part of earth

  13. Sources of Metals • Ore: naturally occurring ______________ ______________________ and from which it is profitable to extract a metal or other material. • Minerals: naturally occurring solid compounds containing the element of interest

  14. Study Buddy Review • What is the atmosphere? • What are minerals? • What is a metal ore?

  15. Metal Properties and Uses

  16. Historic Use of Metals • Gold and silver were probably the first metals used by humans. • Found as free elements (not in ores/compounds) • Decorative • __________________

  17. Historic Use of Metals • Copper used ~10,000 years • Bronze (alloy of _________________) developed about 3800 BC • Alloy: mixture (solution) of different metals • Iron metallurgy (extract iron from iron ore) led to Iron Age ~3000 BC

  18. Study Buddy Review Why were the elements gold and silver probably the first used by humans? What is bronze? When was the Iron Age?

  19. Activity Series

  20. Coinage Metals • Group 11 (Cu, Ag, Au) are sometimes called the coinage metals • _______________________________________ • _______________________________________ • What results did you get for the reactivity of silver in the lab?

  21. Reactivity of Metals Lab • In what order of reactivity did you place the metals tested in lab? • Reactivity means corrosion, formation of new compound, creation of coating, etc. • ________________________ • Is there an order of reactivities of metals in nature?

  22. Activity Series of Metals • __________________________ metal elements ranked in order of their chemical reactivity. • Most reactive metals at the _____ of the list (Mg) • Least reactive metals at the ___________ of the list (Au) • Most reactive metals have low reactive ion in solutions (Mg2+) • Least reactive metals have highly reactive ion in solutions (Ag+)

  23. How do Metals React? • When metals react, they lose electrons • When atoms lose electrons, they form _______________ charges • Process is called _________________ Mg (s)  Mg 2+ (aq) + 2 e- • Where did the electrons go? • Electrons flow to another substance

  24. Substances That Accept Electrons • Substances that ______electrons undergo a process called _________________: Cu 2+ (aq) + 2 e-  Cu (s)

  25. Redox Reactions • Oxidation reactions always accompany reduction reactions • Called _____________________ • OIL RIG • Oxidation is losing electrons • Reduction is gaining electrons

  26. Redox Reactions Cu 2+ (aq) + 2 e-  Cu (s) Mg (s)  Mg 2+ (aq) + 2 e- Cu 2+ (aq) + Mg (s)  Cu (s) • The number of electrons are always conserved ____________________________________________________________________________ • The flow of electrons can be used to create electrical energy.

  27. Summary of Oxidation and Reduction Oxidation Reduction Gain electrons e- appear on left side of arrow in equation Charge number becomes more negative • Lose electrons • e- appear on right side of arrow in equation • Charge number becomes more positive

  28. Oxidizing and Reducing Agents • Oxidizing Agents: are the substances that are ____________(Mg2+) • Reducing agents: are the substances that are ____________(Cu)

  29. Other Methods for Isolating Metals • Electrometallurgy: involving the use of ________________________ to supply electrons to metal ions and reducing them • Pyrometallurgy: the treatment of metals and their ores by _________________ • Oldest ore-processing method • Hydrometallurgy: obtaining metals from their ions by treatment of ores and other metal-containing materials by ______________________________________

  30. Study Buddy Review What is the activity series of metals? What is oxidation? What is reduction? What is an oxidizing agent?

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