Examples of copper in the following topics:
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- Hydrogen sulfides and sulfides react with copper to form various copper sulfides on the surface.
- Hydrogen sulfides and sulfides react with copper to form various copper sulfides on the surface.
- Copper(II) chloride and copper combine to form copper(I) chloride.
- Among the numerous copper sulfides, important examples include copper(I) sulfide and copper(II) sulfide.
- Many other oxyanions form complexes: these include copper(II) acetate, copper(II) nitrate, and copper(II) carbonate.
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- Copper is a member of a family of metals known as the "coinage metals," which includes copper, silver, gold, and roentgenium.
- However, pure copper is too soft to have structural value, but copper alloys with zinc and tin to form harder brasses and bronzes.
- Copper is easy to identify due to its reddish color.
- Copper oxidizes—with some difficulty—to the +1 state in halides and an oxide, and to the +2 state in salts such as copper sulfate CuSO4.
- Copper is heavily used due in many areas, including copper piping.
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- In the United Kingdom, where over ten types of copper-containing IUDs are available, the term IUD only refers to inert or copper-containing devices.
- Copper IUDs work by impairing the mobility of sperm and preventing them from joining with an egg.
- Copper IUDs can increase the rate of menstrual bleeding.
- Most non-hormonal IUDs have a plastic T-shaped frame, wound around with pure electrolytic copper wire with or without copper collars (sleeves).
- The hormonal Mirena does not increase bleeding as do copper-containing IUDs.
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- The Inca were well-known for their use of gold, silver, copper, bronze, and other metals for tools, weapons, and decorative ornaments.
- The Inca were well known for their use of gold, silver, copper, bronze, and other metals.
- Copper and bronze were used for basic farming tools or weapons, such as sharp sticks for digging, club-heads, knives with curved blades, axes, chisels, needles, and pins.
- The Incas had no iron or steel, so their armor and weaponry consisted of helmets, spears, and battle-axes made of copper, bronze, and wood.
- Discuss the Incan use of copper, bronze, silver, gold, and other metals.
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- The classic example is of zinc displacing copper:
- Here, zinc is more active than copper because it can replace copper in solution.
- If you immerse a piece of metallic zinc in a solution of copper sulfate, the surface of the zinc quickly becomes covered with a coating of finely divided copper.
- The blue color of the solution diminishes as copper(II) ion is being replaced.
- Consider, for example, the oxidation of copper by metallic zinc mentioned above.
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- We take two copper electrodes and place them into a solution of blue copper sulfate (CuSO4) and then turn the current on.
- We notice that the the initial blue color of the solution remains unchanged, but it appears that copper has been deposited on one of the electrodes but dissolved on the other.
- At the positive anode, copper metal is oxidized to form Cu2+ ions.
- This is why it appears that the copper has dissolved from the electrode.
- Two copper electrodes are placed in a solution of blue copper sulfate and are connected to a source of electrical current.
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- In a typical voltaic cell, the redox pair is copper and zinc, represented in the following half-cell reactions:
- Copper readily oxidizes zinc; the anode is zinc and the cathode is copper.
- The zinc electrode produces two electrons as it is oxidized ($Zn \rightarrow Zn^{2+} + 2e^-$), which travel through the wire to the copper cathode.
- The electrons then find the Cu2+ in solution and the copper is reduced to copper metal ($Cu^{2+} + 2e^- \rightarrow Cu$).
- During the reaction, the zinc electrode will be used and the metal will shrink in size, while the copper electrode will become larger due to the deposited Cu that is being produced.
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- The gold group consists of gold, copper, lead, aluminium, mercury, and silver.
- Only gold, silver, copper and the platinum metals occur in nature in larger amounts.
- So while copper and iron were known well before the Copper Age and Iron Age, they would not have a large impact on humankind until the technology to smelt them from their ores, and thus mass-produce them, appeared.
- Other significant metallic alloys are those of aluminium, titanium, copper, and magnesium.
- Chuquicamata, Chile, is the site of the largest circumference and second deepest open pit copper mine in the world.
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- 1990s: Hamanaka and the copper market Rogue trader Yasuo Hamanaka, Sumitomo Corporation's chief copper trader, attempted to corner the international copper market over a ten year period leading up to 1996. [6] At one point during this "Sumitomo copper affair," Hamanaka is believed to have controlled approximately 5% of the world copper market. [6] As his scheme collapsed, Sumitomo was left with large positions in the copper market, ultimately losing US$2.6 billion. [7] In 1997 Hamanaka pleaded guilty to criminal charges stemming from his trading activity and was sentenced to an eight year prison sentence.
- 1990s: Hamanaka and the copper marketRogue trader Yasuo Hamanaka, Sumitomo Corporation's chief copper trader, attempted to corner the international copper market over a ten year period leading up to 1996. [6] At one point during this "Sumitomo copper affair," Hamanaka is believed to have controlled approximately 5% of the world copper market. [6] As his scheme collapsed, Sumitomo was left with large positions in the copper market, ultimately losing US$2.6 billion. [7] In 1997 Hamanaka pleaded guilty to criminal charges stemming from his trading activity and was sentenced to an eight year prison sentence.2008: Porsche and shares in VolkswagenDuring the financial crisis of 2007-2010 Porsche cornered the market in shares of Volkswagen, which briefly saw Volkswagen become the world's most valuable company. [8] Porsche claimed that its actions were intended to gain control of Volkswagen rather than to manipulate the market: in this case, while cornering the market in Volkswagen shares, Porsche contracted with naked shorts—enabling it to perform a short squeeze on them. [9] It was ultimately unsuccessful, leading to the resignation of Porsche's chief executive and financial director and to the merger of Porsche into Volkswagen.2010: Armajaro and the European cocoa marketOn July 17, 2010, Armajaro purchased 240,100 tonnes of cocoa.
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- Copper is commonly used in wires due to its high conductivity and relatively inexpensive price.
- This wire consists of a core of copper (a conductor) and a coating of polyethylene (an insulator).
- The copper allows current to flow through the wire, while the polyethylene ensures that the current does not escape.