Earth’s Mineral Resources Unit 2 Sect B Environmental Chemistry.
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Transcript of Earth’s Mineral Resources Unit 2 Sect B Environmental Chemistry.
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Earth’s Mineral ResourcesUnit 2 Sect B
Environmental Chemistry
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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
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Cross Section of the Earth
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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
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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
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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
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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
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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
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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)
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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?
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Sources and Uses of Metals
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Sources of Elements on Earth
• Atmosphere: _______________________
• Hydrosphere: water components of the earth’s surface
• Lithosphere: solid part of earth
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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
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Study Buddy Review
• What is the atmosphere?
• What are minerals?
• What is a metal ore?
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Metal Properties and Uses
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Historic Use of Metals
• Gold and silver were probably the first metals used by humans.– Found as free elements (not in
ores/compounds)– Decorative– __________________
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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
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Study Buddy Review
• Why were the elements gold and silver probably the first used by humans?
• What is bronze?
• When was the Iron Age?
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Activity Series
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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?
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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?
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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+)
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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
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Substances That Accept Electrons
• Substances that ______electrons undergo a process called _________________:
Cu 2+ (aq) + 2 e- Cu (s)
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Redox Reactions
• Oxidation reactions always accompany reduction reactions
• Called _____________________
• OIL RIG – Oxidation is losing electrons– Reduction is gaining electrons
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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.
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Summary of Oxidation and Reduction
Oxidation
• Lose electrons• e- appear on right side of
arrow in equation• Charge number becomes
more positive
Reduction
• Gain electrons• e- appear on left side of
arrow in equation• Charge number becomes
more negative
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Oxidizing and Reducing Agents
• Oxidizing Agents: are the substances that are ____________(Mg2+)
• Reducing agents: are the substances that are ____________(Cu)
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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 ______________________________________
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Study Buddy Review
• What is the activity series of metals?
• What is oxidation?
• What is reduction?
• What is an oxidizing agent?