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84-528: Gale Centre is a four rink ice complex containing a 2,170 seat arena located in Niagara Falls, Ontario . It was built on the site of the demolished Cyanamid Niagara plant. This article about a sports venue in Canada is a stub . You can help Misplaced Pages by expanding it . Ice rink The word "rink" is a word of Scottish origin meaning "course", used to describe the ice surface used in

168-579: A Gilman reagent . These can undergo substitution with alkyl halides to form coupling products ; as such, they are important in the field of organic synthesis . Copper(I) acetylide is highly shock-sensitive but is an intermediate in reactions such as the Cadiot–Chodkiewicz coupling and the Sonogashira coupling . Conjugate addition to enones and carbocupration of alkynes can also be achieved with organocopper compounds. Copper(I) forms

252-420: A Scottish word meaning 'course', was used as the name of a place where curling was played. As curling is played on ice, the name has been retained for the construction of ice areas for other sports and uses. Early attempts in the construction of artificial ice rinks were first made in the 'rink mania' of 1841–44. The technology for the maintenance of natural ice did not exist, therefore these early rinks used

336-696: A covalent character and are relatively weak. This observation explains the low hardness and high ductility of single crystals of copper. At the macroscopic scale, introduction of extended defects to the crystal lattice , such as grain boundaries, hinders flow of the material under applied stress, thereby increasing its hardness. For this reason, copper is usually supplied in a fine-grained polycrystalline form, which has greater strength than monocrystalline forms. The softness of copper partly explains its high electrical conductivity ( 59.6 × 10   S /m ) and high thermal conductivity, second highest (second only to silver) among pure metals at room temperature. This

420-643: A nickel ) consists of 75% copper and 25% nickel in homogeneous composition. Prior to the introduction of cupronickel, which was widely adopted by countries in the latter half of the 20th century, alloys of copper and silver were also used, with the United States using an alloy of 90% silver and 10% copper until 1965, when circulating silver was removed from all coins with the exception of the half dollar—these were debased to an alloy of 40% silver and 60% copper between 1965 and 1970. The alloy of 90% copper and 10% nickel, remarkable for its resistance to corrosion,

504-407: A pinkish-orange color . Copper is used as a conductor of heat and electricity, as a building material , and as a constituent of various metal alloys , such as sterling silver used in jewelry , cupronickel used to make marine hardware and coins , and constantan used in strain gauges and thermocouples for temperature measurement. Copper is one of the few metals that can occur in nature in

588-425: A spin of 3 ⁄ 2 . The other isotopes are radioactive , with the most stable being Cu with a half-life of 61.83 hours. Seven metastable isomers have been characterized; Cu is the longest-lived with a half-life of 3.8 minutes. Isotopes with a mass number above 64 decay by β , whereas those with a mass number below 64 decay by β . Cu , which has

672-399: A blast furnace. A potential source of copper is polymetallic nodules, which have an estimated concentration 1.3%. Like aluminium , copper is recyclable without any loss of quality, both from raw state and from manufactured products. In volume, copper is the third most recycled metal after iron and aluminium. An estimated 80% of all copper ever mined is still in use today. According to

756-464: A blue crystalline penta hydrate , the most familiar copper compound in the laboratory. It is used in a fungicide called the Bordeaux mixture . Polyols , compounds containing more than one alcohol functional group , generally interact with cupric salts. For example, copper salts are used to test for reducing sugars . Specifically, using Benedict's reagent and Fehling's solution the presence of

840-458: A cold climate, indoors or outdoors, although both types are of frozen water. A more proper technical term is 'mechanically frozen' ice. An example of this type of rink is the outdoor rink at Rockefeller Center in New York . Modern rinks have a specific procedure for preparing the surface. With the pipes cold, a thin layer of water is sprayed on the sand or concrete to seal and level it (or in

924-709: A directly usable metallic form ( native metals ). This led to very early human use in several regions, from c.  8000 BC . Thousands of years later, it was the first metal to be smelted from sulfide ores, c.  5000 BC ; the first metal to be cast into a shape in a mold, c.  4000 BC ; and the first metal to be purposely alloyed with another metal, tin , to create bronze , c.  3500 BC . Commonly encountered compounds are copper(II) salts, which often impart blue or green colors to such minerals as azurite , malachite , and turquoise , and have been used widely and historically as pigments. Copper used in buildings, usually for roofing, oxidizes to form

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1008-457: A green patina of compounds called verdigris . Copper is sometimes used in decorative art , both in its elemental metal form and in compounds as pigments. Copper compounds are used as bacteriostatic agents , fungicides , and wood preservatives . Copper is essential to all living organisms as a trace dietary mineral because it is a key constituent of the respiratory enzyme complex cytochrome c oxidase . In molluscs and crustaceans , copper

1092-505: A half-life of 12.7 hours, decays both ways. Cu and Cu have significant applications. Cu is used in Cu Cu-PTSM as a radioactive tracer for positron emission tomography . Copper is produced in massive stars and is present in the Earth's crust in a proportion of about 50 parts per million (ppm). In nature, copper occurs in

1176-687: A layer of brown-black copper oxide which, unlike the rust that forms on iron in moist air, protects the underlying metal from further corrosion ( passivation ). A green layer of verdigris (copper carbonate) can often be seen on old copper structures, such as the roofing of many older buildings and the Statue of Liberty . Copper tarnishes when exposed to some sulfur compounds, with which it reacts to form various copper sulfides . There are 29 isotopes of copper. Cu and Cu are stable, with Cu comprising approximately 69% of naturally occurring copper; both have

1260-532: A natural color other than gray or silver. Pure copper is orange-red and acquires a reddish tarnish when exposed to air. This is due to the low plasma frequency of the metal, which lies in the red part of the visible spectrum, causing it to absorb the higher-frequency green and blue colors. As with other metals, if copper is put in contact with another metal in the presence of an electrolyte , galvanic corrosion will occur. Copper does not react with water, but it does slowly react with atmospheric oxygen to form

1344-458: A properly built space. This consists of a bed of sand or occasionally a slab of concrete , through (or on top of) which pipes run. The pipes carry a chilled fluid (usually either a salt brine or water with antifreeze , or in the case of smaller rinks, refrigerant ) which can lower the temperature of the slab so that water placed atop will freeze. This method is known as 'artificial ice' to differentiate from ice rinks made by simply freezing water in

1428-407: A red-brown precipitate with copper(II) salts. Compounds that contain a carbon-copper bond are known as organocopper compounds. They are very reactive towards oxygen to form copper(I) oxide and have many uses in chemistry . They are synthesized by treating copper(I) compounds with Grignard reagents , terminal alkynes or organolithium reagents ; in particular, the last reaction described produces

1512-451: A rich variety of compounds, usually with oxidation states +1 and +2, which are often called cuprous and cupric , respectively. Copper compounds promote or catalyse numerous chemical and biological processes. As with other elements, the simplest compounds of copper are binary compounds, i.e. those containing only two elements, the principal examples being oxides, sulfides, and halides . Both cuprous and cupric oxides are known. Among

1596-434: A solid polymer material designed for skating using normal metal-bladed ice skates. High density polyethelene (HDPE) and ultra-high molecular weight polyethylene (UHMW) are the only materials that offer reasonable skating characteristics, with UHMW synthetic rinks offering the most ice-like skating but also being the most expensive. A typical synthetic rink will consist of many panels of thin surface material assembled on top of

1680-417: A solution of glycerine with ether , nitrogen peroxide and water . The pipes were covered by water and the solution was pumped through, freezing the water into ice . Gamgee discovered the process while attempting to develop a method to freeze meat for import from Australia and New Zealand , and patented it as early as 1870. Gamgee operated the rink on a membership-only basis and attempted to attract

1764-423: A sturdy, level and smooth sub-floor (anything from concrete to wood or even dirt or grass) to create a large skating area. Periodically after the ice has been used, it is resurfaced using a machine called an ice resurfacer (sometimes colloquially referred to as a Zamboni – referring to a major manufacturer of such machinery). For curling, the surface is 'pebbled' by allowing loose drops of cold water to fall onto

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1848-561: A substitute consisting of a mixture of hog's lard and various salts. An item in the May 8, 1844 issue of Eliakim Littell 's Living Age headed "The Glaciarium" reported that "This establishment, which has been removed to Grafton street East' Tottenham Court Road , was opened on Monday afternoon. The area of artificial ice is extremely convenient for such as may be desirous of engaging in the graceful and manly pastime of skating". By 1844, these venues fell out of fashion as customers grew tired of

1932-424: A variety of minerals, including native copper , copper sulfides such as chalcopyrite , bornite , digenite , covellite , and chalcocite , copper sulfosalts such as tetrahedite-tennantite , and enargite , copper carbonates such as azurite and malachite , and as copper(I) or copper(II) oxides such as cuprite and tenorite , respectively. The largest mass of elemental copper discovered weighed 420 tonnes and

2016-436: A variety of weak complexes with alkenes and carbon monoxide , especially in the presence of amine ligands. Copper(III) is most often found in oxides. A simple example is potassium cuprate , KCuO 2 , a blue-black solid. The most extensively studied copper(III) compounds are the cuprate superconductors . Yttrium barium copper oxide (YBa 2 Cu 3 O 7 ) consists of both Cu(II) and Cu(III) centres. Like oxide, fluoride

2100-768: A wealthy clientele, experienced in open-air ice skating during winters in the Alps . He installed an orchestra gallery, which could also be used by spectators, and decorated the walls with views of the Swiss Alps . The rink initially proved a success, and Gamgee opened two further rinks later in the year: at Rusholme in Manchester and the "Floating Glaciarium" at Charing Cross in London, this last significantly larger at 35.1 by 7.6 metres (115 by 25 ft). The Southport Glaciarium opened in 1879, using Gamgee's method. In

2184-583: Is a constituent of the blood pigment hemocyanin , replaced by the iron-complexed hemoglobin in fish and other vertebrates . In humans, copper is found mainly in the liver, muscle, and bone. The adult body contains between 1.4 and 2.1 mg of copper per kilogram of body weight. In the Roman era , copper was mined principally on Cyprus , the origin of the name of the metal, from aes cyprium (metal of Cyprus), later corrupted to cuprum (Latin). Coper ( Old English ) and copper were derived from this,

2268-405: Is a highly basic anion and is known to stabilize metal ions in high oxidation states. Both copper(III) and even copper(IV) fluorides are known, K 3 CuF 6 and Cs 2 CuF 6 , respectively. Some copper proteins form oxo complexes , which, in extensively studied synthetic analog systems, feature copper(III). With tetrapeptides , purple-colored copper(III) complexes are stabilized by

2352-401: Is because the resistivity to electron transport in metals at room temperature originates primarily from scattering of electrons on thermal vibrations of the lattice, which are relatively weak in a soft metal. The maximum possible current density of copper in open air is approximately 3.1 × 10  A/m , above which it begins to heat excessively. Copper is one of a few metallic elements with

2436-529: Is critical. The popularity of the sport of hockey in Canada has led its icemakers to be particularly sought after. One such team of professionals was responsible for placing a loonie coin under center ice at the 2002 Winter Olympics in Salt Lake City, Utah ; as both Canadian teams (men's and women's) won their respective hockey gold medals, the coin was christened "lucky" and is now in the possession of

2520-611: Is located on the campus of Northeastern University . This American rink is the original home of the National Hockey League (NHL) Boston Bruins . The Bruins are the only remaining NHL team who are members of the NHL's Original Six with their original home arena still in existence. The Guidant John Rose Minnesota Oval is an outdoor ice rink in Roseville, Minnesota , that is large enough to allow ice skaters to play

2604-533: Is melted in a furnace and then reduced and cast into billets and ingots ; lower-purity scrap is refined by electroplating in a bath of sulfuric acid . The environmental cost of copper mining was estimated at 3.7 kg CO2eq per kg of copper in 2019. Codelco, a major producer in Chile, reported that in 2020 the company emitted 2.8t CO2eq per ton (2.8 kg CO2eq per kg) of fine copper. Greenhouse gas emissions primarily arise from electricity consumed by

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2688-444: Is one of the most important constituents of silver and karat gold solders used in the jewelry industry, modifying the color, hardness and melting point of the resulting alloys. Some lead-free solders consist of tin alloyed with a small proportion of copper and other metals. The alloy of copper and nickel , called cupronickel , is used in low-denomination coins, often for the outer cladding. The US five-cent coin (currently called

2772-437: Is recovered from mine tailings and heaps. A variety of methods are used including leaching with sulfuric acid, ammonia, ferric chloride. Biological methods are also used. A significant source of copper is from recycling. Recycling is facilitated because copper is usually deployed in its metallic state. In 2001, a typical automobile contained 20–30 kg of copper. Recycling usually begins with some melting process using

2856-440: Is typically played on a tarmac tennis court that has been flooded with water and allowed to freeze. The sports of broomball, curling, ice stock sport, spongee, Moscow broomball, and the game of crokicurl, do not use ice skates of any kind. While technically not an ice rink, ice tracks and trails , such as those used in the sport of speed skating and recreational or pleasure skating are sometimes referred to as "ice rinks". Rink ,

2940-411: Is used for various objects exposed to seawater, though it is vulnerable to the sulfides sometimes found in polluted harbors and estuaries. Alloys of copper with aluminium (about 7%) have a golden color and are used in decorations. Shakudō is a Japanese decorative alloy of copper containing a low percentage of gold, typically 4–10%, that can be patinated to a dark blue or black color. Copper forms

3024-686: The British Geological Survey , in 2005, Chile was the top producer of copper with at least one-third of the world share followed by the United States, Indonesia and Peru. Copper can also be recovered through the in-situ leach process. Several sites in the state of Arizona are considered prime candidates for this method. The amount of copper in use is increasing and the quantity available is barely sufficient to allow all countries to reach developed world levels of usage. An alternative source of copper for collection currently being researched are polymetallic nodules , which are located at

3108-607: The Great Lakes may have also been mining copper during this time, making it one of the oldest known examples of copper extraction in the world. There is evidence from prehistoric lead pollution from lakes in Michigan that people in the region began mining copper c.  6000 BC . Evidence suggests that utilitarian copper objects fell increasingly out of use in the Old Copper Complex of North America during

3192-486: The Hockey Hall of Fame after having been retrieved from beneath the ice. In bandy , the size of the playing field is 90–110 m (300–360 ft) x 45–65 m (148–213 ft). For internationals, the size must not be smaller than 100 m × 60 m (330 ft × 200 ft). The variety rink bandy is played on ice hockey rinks . The size of figure skating rinks can be quite variable, but

3276-553: The International Resource Panel 's Metal Stocks in Society report , the global per capita stock of copper in use in society is 35–55 kg. Much of this is in more-developed countries (140–300 kg per capita) rather than less-developed countries (30–40 kg per capita). The process of recycling copper is roughly the same as is used to extract copper but requires fewer steps. High-purity scrap copper

3360-511: The International Skating Union prefers Olympic-sized rinks for figure skating competitions, particularly for major events. These are 60 by 30 m (197 by 98 ft). The ISU specifies that competition rinks must not be larger than this and not smaller than 56 by 26 m (184 by 85 ft). Although there is a great deal of variation in the dimensions of actual ice rinks, there are basically two rink sizes in use at

3444-726: The Neolithic period and the Bronze Age was formerly termed the Chalcolithic period (copper-stone), when copper tools were used with stone tools. The term has gradually fallen out of favor because in some parts of the world, the Chalcolithic and Neolithic are coterminous at both ends. Brass, an alloy of copper and zinc, is of much more recent origin. It was known to the Greeks, but became a significant supplement to bronze during

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3528-525: The Vinča culture date to 4500 BC. Sumerian and Egyptian artifacts of copper and bronze alloys date to 3000 BC. Egyptian Blue , or cuprorivaite (calcium copper silicate) is a synthetic pigment that contains copper and started being used in ancient Egypt around 3250 BC. The manufacturing process of Egyptian blue was known to the Romans, but by the fourth century AD the pigment fell out of use and

3612-612: The winter in climates where the surface freezes thickly enough to support human weight. Rinks can also be made in cold climates by enclosing a level area of ground, filling it with water, and letting it freeze. Snow may be packed to use as a containment material. An example of this type of "rink", which is a body of water converted into a skating trail during winter, is the Rideau Canal Skateway in Ottawa, Ontario . In any climate, an arena ice surface can be installed in

3696-613: The 'smelly' ice substitute. It wasn't until thirty years later that refrigeration technology developed to the point where natural ice could finally be feasibly used in the rink. The world's first mechanically frozen ice rink was the Glaciarium , opened by John Gamgee , a British veterinarian and inventor, in a tent in a small building just off the Kings Road in Chelsea, London , on 7 January 1876. Gamgee had become fascinated by

3780-548: The 9th or 10th century AD. Carbon dating has established mining at Alderley Edge in Cheshire , UK, at 2280 to 1890 BC. Ötzi the Iceman , a male dated from 3300 to 3200 BC, was found with an axe with a copper head 99.7% pure; high levels of arsenic in his hair suggest an involvement in copper smelting. Experience with copper has assisted the development of other metals; in particular, copper smelting likely led to

3864-517: The Bronze Age and a shift towards an increased production of ornamental copper objects occurred. Natural bronze, a type of copper made from ores rich in silicon, arsenic, and (rarely) tin, came into general use in the Balkans around 5500 BC. Alloying copper with tin to make bronze was first practiced about 4000 years after the discovery of copper smelting, and about 2000 years after "natural bronze" had come into general use. Bronze artifacts from

3948-541: The Middle East; a copper pendant was found in northern Iraq that dates to 8700 BC. Evidence suggests that gold and meteoric iron (but not smelted iron) were the only metals used by humans before copper. The history of copper metallurgy is thought to follow this sequence: first, cold working of native copper, then annealing , smelting , and, finally, lost-wax casting . In southeastern Anatolia , all four of these techniques appear more or less simultaneously at

4032-790: The United States opened in 1894, the North Avenue Ice Palace in Baltimore, Maryland , and the Ice Palace in New York City . The St. Nicholas Rink , ( a.k.a. "St. Nicholas Arena"), was an indoor ice rink in New York City which existed from 1896 until its demolition in the 1980s. It was one of the earliest American indoor ice rinks made of mechanically frozen ice in North America and gave ice skaters

4116-521: The affected areas is highly acidic, with a pH range of 2.1–4.9, and shows elevated electrical conductivity levels between 280 and 1561 mS/cm. These changes in water chemistry make the environment inhospitable for fish, essentially rendering the water uninhabitable for aquatic life. Numerous copper alloys have been formulated, many with important uses. Brass is an alloy of copper and zinc . Bronze usually refers to copper- tin alloys, but can refer to any alloy of copper such as aluminium bronze . Copper

4200-541: The atmosphere; 150 mg/kg in soil; 30 mg/kg in vegetation; 2 μg/L in freshwater and 0.5 μg/L in seawater. Most copper is mined or extracted as copper sulfides from large open pit mines in porphyry copper deposits that contain 0.4 to 1.0% copper. Sites include Chuquicamata , in Chile, Bingham Canyon Mine , in Utah, United States, and El Chino Mine , in New Mexico, United States. According to

4284-766: The beginning of the Neolithic c.  7500 BC . Copper smelting was independently invented in different places. The earliest evidence of lost-wax casting copper comes from an amulet found in Mehrgarh , Pakistan, and is dated to 4000 BC. Investment casting was invented in 4500–4000 BC in Southeast Asia Smelting was probably discovered in China before 2800 BC, in Central America around 600 AD, and in West Africa about

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4368-416: The case of concrete, to keep it from being marked). This thin layer is painted white or pale blue for better contrast; markings necessary for hockey or curling are also placed, along with logos or other decorations. Another thin layer of water is sprayed on top of this. The ice is built up to a thickness of 19 to 38 mm ( 3 ⁄ 4 to 1 + 1 ⁄ 2  in). Synthetic rinks are constructed from

4452-531: The company, especially when sourced from fossil fuels, and from engines required for copper extraction and refinement. Companies that mine land often mismanage waste, rendering the area sterile for life. Additionally, nearby rivers and forests are also negatively impacted. The Philippines is an example of a region where land is overexploited by mining companies. Copper mining waste in Valea Şesei, Romania, has significantly altered nearby water properties. The water in

4536-522: The deprotonated amide ligands. Complexes of copper(III) are also found as intermediates in reactions of organocopper compounds, for example in the Kharasch–Sosnovsky reaction . A timeline of copper illustrates how this metal has advanced human civilization for the past 11,000 years. Copper occurs naturally as native metallic copper and was known to some of the oldest civilizations on record. The history of copper use dates to 9000 BC in

4620-461: The depths of the Pacific Ocean approximately 3000–6500 meters below sea level. These nodules contain other valuable metals such as cobalt and nickel . Copper has been in use for at least 10,000 years, but more than 95% of all copper ever mined and smelted has been extracted since 1900. As with many natural resources, the total amount of copper on Earth is vast, with around 10 tons in

4704-563: The discovery of iron smelting . Production in the Old Copper Complex in Michigan and Wisconsin is dated between 6500 and 3000 BC. A copper spearpoint found in Wisconsin has been dated to 6500 BC. Copper usage by the indigenous peoples of the Old Copper Complex from the Great Lakes region of North America has been radiometrically dated to as far back as 7500 BC. Indigenous peoples of North America around

4788-545: The fastest water exchange rate (speed of water ligands attaching and detaching) for any transition metal aquo complex . Adding aqueous sodium hydroxide causes the precipitation of light blue solid copper(II) hydroxide . A simplified equation is: Aqueous ammonia results in the same precipitate. Upon adding excess ammonia, the precipitate dissolves, forming tetraamminecopper(II) : Many other oxyanions form complexes; these include copper(II) acetate , copper(II) nitrate , and copper(II) carbonate . Copper(II) sulfate forms

4872-638: The highest levels of ice hockey . Historically, earlier ice rinks were smaller than today. Official National Hockey League rinks are 26 m × 61 m (85 ft × 200 ft). The dimensions originate from the size of the Victoria Skating Rink in Montreal, Quebec , Canada. Official Olympic and International ice hockey rinks have dimensions of 30 m × 60 m (98.4 ft × 197 ft). Sledge hockey ( a.k.a. "Para ice hockey", or "sled hockey"), uses

4956-571: The ice and freeze into rounded peaks. Between events, especially if the arena is being used without need for the ice surface, it is either covered with a heavily insulated floor or melted by allowing the fluid in the pipes below the ice to warm. A highly specialized form of rink is used for speed skating ; this is a large oval (or ring ) much like an athletic track. Because of their limited use, speed skating ovals are far less common than hockey or curling rinks. Those skilled at preparing arena ice are often in demand for major events where ice quality

5040-421: The lanes surround the exterior of an ice rink. The sport requires the use of a special type of racing skate, the speed skating ice skate . Copper Copper is a chemical element ; it has symbol Cu (from Latin cuprum ) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity . A freshly exposed surface of pure copper has

5124-517: The largest artificial outdoor refrigerated sheet of ice in North America. It is a world-class facility that is primarily used for ice sports such as ice skating, ice hockey, speed skating, and bandy. The oval hosts several national and international competitions throughout the year, including the USA Cup in bandy. The first building in Canada to be electrified was the Victoria Skating Rink which opened in 1862 in Montreal , Quebec, Canada. The rink

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5208-511: The later spelling first used around 1530. Copper, silver , and gold are in group 11 of the periodic table; these three metals have one s-orbital electron on top of a filled d- electron shell and are characterized by high ductility , and electrical and thermal conductivity. The filled d-shells in these elements contribute little to interatomic interactions, which are dominated by the s-electrons through metallic bonds . Unlike metals with incomplete d-shells, metallic bonds in copper are lacking

5292-419: The level of <1% Cu. Concentration of the ore is required, which begins with comminution followed by froth flotation . The remaining concentrate is the smelted, which can be described with two simplified equations: Cuprous oxide reacts with cuprous sulfide to convert to blister copper upon heating This roasting gives matte copper, roughly 50% Cu by weight, which is purified by electrolysis. Depending on

5376-630: The marshlands of The Fens , skating was developed early as a pastime during winter where there were plenty of natural ice surfaces. This is the origin of the Fen skating and is said to be the birthplace of bandy . The Great Britain Bandy Association has its home in the area. In Germany, the first ice skating rink opened in 1882 in Frankfurt during a patent exhibition. It covered 520 m (5,600 sq ft) and operated for two months;

5460-454: The measurements of an ice hockey rink , though may be slightly larger due to the sport having originated in Europe where the bandy field influenced the size and development of smaller ice rinks. Tracks and trails are occasionally referred to as ice rinks in spite of their differences. Ice skating tracks and ice skating trails are used for recreational exercise and sporting activities during

5544-472: The modern world. The price of copper is volatile . After a peak in 2022 the price unexpectedly fell. The global market for copper is one of the most commodified and financialized of the commodity markets , and has been so for decades. The great majority of copper ores are sulfides. Common ores are the sulfides chalcopyrite (CuFeS 2 ), bornite (Cu 5 FeS 4 ) and, to a lesser extent, covellite (CuS) and chalcocite (Cu 2 S). These ores occur at

5628-516: The numerous copper sulfides , important examples include copper(I) sulfide ( Cu 2 S ) and copper monosulfide ( CuS ). Cuprous halides with fluorine , chlorine , bromine , and iodine are known, as are cupric halides with fluorine , chlorine , and bromine . Attempts to prepare copper(II) iodide yield only copper(I) iodide and iodine. Copper forms coordination complexes with ligands . In aqueous solution, copper(II) exists as [Cu(H 2 O) 6 ] . This complex exhibits

5712-438: The only winter activities or sports whereby ice skaters use tracks and lanes designed to include bends rather than using a simple straightway. Some ice rinks are constructed in a manner allowing for a speed skating rink to be created around its outside perimeter. Speed skating tracks or "rinks" can either be created naturally or artificially and are made either outdoors or inside indoor facilities. Tracks may be created by having

5796-500: The opportunity to enjoy an extended skating season. The rink was used for pleasure skating, ice hockey , and ice skating , and was an important rink involved in the development of the sports of ice hockey and boxing in the United States . The oldest indoor artificial ice rink still in use in the United States is Boston, Massachusetts 's, Matthews Arena (formerly Boston Arena) which was built between 1909 and 1910. The rink

5880-428: The ore, sometimes other metals are obtained during the electrolysis including platinum and gold. Aside from sulfides, another family of ores are oxides. Approximately 15% of the world's copper supply derives from these oxides. The beneficiation process for oxides involves extraction with sulfuric acid solutions followed by electrolysis. In parallel with the above method for "concentrated" sulfide and oxide ores, copper

5964-436: The refrigeration system was designed by Jahre Linde, and was probably the first skating rink where ammonia was used as a refrigerant. Ten years later, a larger rink was permanently installed on the same site. Ice skating quickly became a favorite pastime and craze in several American cities around the mid 1800s spawning a construction period of several ice rinks. Two early indoor ice rinks made of mechanically frozen ice in

6048-409: The refrigeration technology he encountered during a study trip to America to look at Texas fever in cattle. In March of that same year it moved to a permanent venue at 379 Kings Road, where a rink measuring 12.2 by 7.3 metres (40 by 24 ft) was established. The rink was based on a concrete surface, with layers of earth, cow hair and timber planks. Atop these were laid oval copper pipes carrying

6132-499: The rink dimensions defined by a standard Canadian ice hockey rink . The sport of spongee , a.k.a. "sponge hockey", does not use ice skates. A skateless outdoor winter variant of ice hockey, spongee has its own rules codes and is played strictly within the Canadian city of Winnipeg as a cult sport. The sport generally uses the rink dimensions defined by a standard Canadian ice hockey rink . Rinkball rinks today typically use

6216-790: The same rink dimensions used by ice hockey rinks . Ringette utilizes most of the standard ice hockey markings used by Hockey Canada , but the ringette rink uses additional free-pass dots in each of the attacking zones and centre zone areas as well as a larger goal crease area. Two additional free-play lines (one in each attacking zone) are also required. A ringette rink is an ice rink designed for ice hockey which has been modified to enable ringette to be played. Though some ice surfaces are designed strictly for ringette, these ice rinks with exclusive lines and markings for ringette are usually created only at venues hosting major ringette competitions and events . Most ringette rinks are found in Canada and Finland . Playing area, size, lines and markings for

6300-750: The secret to its manufacturing process became lost. The Romans said the blue pigment was made from copper, silica, lime and natron and was known to them as caeruleum . The Bronze Age began in Southeastern Europe around 3700–3300 BC, in Northwestern Europe about 2500 BC. It ended with the beginning of the Iron Age, 2000–1000 BC in the Near East, and 600 BC in Northern Europe. The transition between

6384-607: The sport of bandy . Its perimeter is used as an oval speed skating track. The facility was constructed between June and December 1993. It is the only regulation-sized bandy field in North America and serves as the home of USA Bandy and its national bandy teams. The $ 3.9 million renovation project planned for the Guidant John Rose Minnesota Oval was set to be completed before the opening of the rink's 29th season on November 18, 2022. The oval measures at 400 meters long and 200 meters wide, which makes it

6468-406: The sport of curling , but was kept in use once the winter team sport of ice hockey became established. There are two types of ice rinks in prevalent use today: natural ice rinks , where freezing occurs from cold ambient temperatures, and artificial ice rinks (or mechanically frozen), where a coolant produces cold temperatures underneath the water body(on which the game is played), causing

6552-405: The standard Canadian ringette rink are similar to the average ice hockey rink in Canada with certain modifications. Early in its history, ringette was played mostly on rinks constructed for ice hockey, broomball , figure skating , and recreational skating, and was mostly played on outdoor rinks since few indoor ice rinks were available at the time. The organized format of broomball uses

6636-438: The sugar is signaled by a color change from blue Cu(II) to reddish copper(I) oxide. Schweizer's reagent and related complexes with ethylenediamine and other amines dissolve cellulose . Amino acids such as cystine form very stable chelate complexes with copper(II) including in the form of metal-organic biohybrids (MOBs). Many wet-chemical tests for copper ions exist, one involving potassium ferricyanide , which gives

6720-399: The top kilometer of Earth's crust, which is about 5 million years' worth at the current rate of extraction. However, only a tiny fraction of these reserves is economically viable with present-day prices and technologies. Estimates of copper reserves available for mining vary from 25 to 60 years, depending on core assumptions such as the growth rate. Recycling is a major source of copper in

6804-531: The water body to freeze and then stay frozen. There are also synthetic ice rinks where skating surfaces are made out of plastics. Besides recreational ice skating, some of its uses include: ice hockey, sledge hockey ( a.k.a. "Para ice hockey", or "sled hockey"), spongee ( a.k.a. sponge hockey), bandy , rink bandy , rinkball , ringette , broomball (both indoor and outdoor versions), Moscow broomball , speed skating , figure skating , ice stock sport , curling, and crokicurl . However, Moscow broomball

6888-511: The winter season including distance ice skating. Ice trails are created by natural bodies of water such as rivers, which freeze during winter, though some trails are created by removing snow to create skating lanes on large frozen lakes for ice skaters. Ice trails are usually used for pleasure skating, though the sport and recreational activity of Tour skating can involve ice skaters passing over ice trails and open areas created by frozen lakes. To date, speed skating and ice cross downhill are

6972-435: Was created using natural ice . At the start of the twentieth century it had been described as "one of the finest covered rinks in the world" and was used during winter for pleasure skating, ice hockey, and skating sports. In summer months, the building was used for various other events. Many ice rinks consist of, or are found on, open bodies of water such as lakes, ponds, canals, and sometimes rivers; these can be used only in

7056-527: Was found in 1857 on the Keweenaw Peninsula in Michigan, US. Native copper is a polycrystal , with the largest single crystal ever described measuring 4.4 × 3.2 × 3.2 cm . Copper is the 26th most abundant element in Earth's crust , representing 50 ppm compared with 75 ppm for zinc , and 14 ppm for lead . Typical background concentrations of copper do not exceed 1 ng/m in

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