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![]() World production is around 14.000 tonnes per year, the main producing country is Canada, with the USA, Australia, Mexico, JApan and Peru also being the major suppliers. ![]() Consequently, the main mining areas are those associated with zinc. No cadmium ore is mined for the metal, because more than enough is produced as a byproduct of the smelting of zinc from its ore, sphelerite (ZnS), in which CdS is a significant impurity, making up as much as 3%. The rest of the cadmium is released through human activities, such as manufacturing. About half of this cadmium is released into rivers through weathering of rocks and some cadmium is released into air through forest fires and volcanoes. Naturally a very large amount of cadmium is released into the environment, about 25,000 tons a year. After being applied it enters the environment mainly through the ground, because it is found in manures and pesticides. Cadmium also consists in the industries as an inevitable by-product of zinc, lead and copper extraction. It always occurs in combination with zinc. Cadmium has the ability to absorb neutrons, so it is used as a barrier to control nuclear fission.Ĭadmium can mainly be found in the earth's crust. Cadium has been used particularly to electroplate steel where a film of cadmium only 0.05 mm thick will provide complete protection against the sea. It is similar in many respects to zinc but it forms more complex compounds.Ībout three-fourths of cadmium is used in Ni-Cd batteries, most of the remaining one-fourth is used mainly for pigments, coatings and plating, and as stabilizers for plastics. It is soluble in acids but not in alkalis. Its surface has a bluish tinge and the metal is soft enough to be cut with a knife, but it tarnishes in air. ![]() Separation and Concentration Purification RequestĬadmium - Cd Chemical properties of cadmium - Health effects of cadmium - Environmental effects of cadmiumĬadmium is a lustrous, silver-white, ductile, very malleable metal.Plant Inspection & Process Optimalisation.In chemistry this is done according to physical and chemical properties. to classify close classify To arrange something into classes according to characteristics. For example, melting point, electrical conductivity, appearance at room temperature. It is possible to use information about an element’s physical properties close physical property A property of an element or compound which can be directly observed or measured. Metals are found on the left and in the middle, whereas non-metals are all on the right. The periodic table can be used to find out if an element is a metal or a non-metal. Elements are listed on the periodic table. account for around 20% of known elements close element A pure substance which is made from only one type of atom. Non-metal elements are on the right hand side of the periodic table. are metals, while non-metals close non-metal A substance that has the typical properties of a non-metal. It allows us to spot patterns and make predictions about other elements. Most elements in the periodic table close periodic table A table which lists all of the chemical elements and arranges them in a way that is useful. Gethin: They would just melt and it would just make a mess anyway. Gethin: So, it's great for thermometers, but not so good for pots and pans. So, when it gets hot the space between the particles expands and then this rises up the thermometer. Miss Armit: Yeah, because mercury's a great conductor of heat. Gethin: Well, it's something to do with the heat. Miss Armit: It's the only liquid transistor metal and because of its properties it's perfect for a thermometer. And gold and silver are used in jewellery, because they're shiny, they're malleable and unreactive with oxygen, so they don't rust easily. We've also got iron and aluminium and they're great at conducting heat, so we use these metals for our pots and pans. Miss Armit: Well, we've got copper and it's a really good conductor of electricity, so we use that in our wires. And what metals are we talking about here and what are they used for. Miss Armit: So their key properties are they conduct electricity, they conduct heat, they are malleable - which means they're bendy - and they're shiny. ![]() So we're going to talk about transition metals, which are found in the middle of the periodic table. Gethin: I think this is going to be good, isn't it. Miss Armit: So what we're going to look at today are the metal elements in Group 1 of the periodic table, along with the metal elements in the transition metal block of the periodic table and their properties. And today, we're going to be looking at the periodic table. What she doesn't know about chemistry is not worth knowing. Gethin: Today, we've got super science teacher Miss Armit with us. ![]()
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