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Вы можете ознакомиться и скачать презентацию на тему Inert metals. Доклад-сообщение содержит 24 слайдов. Презентации для любого класса можно скачать бесплатно. Если материал и наш сайт презентаций Mypresentation Вам понравились – поделитесь им с друзьями с помощью социальных кнопок и добавьте в закладки в своем браузере.

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General Properties They do not have a tendency to have an ionic structure so they are inert in chemical reactions. They have very high density, so they are called heavy metals. They are found in nature as pure metals.

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Copper is also used in the production of alloys. Some important alloys are: Copper is also used in the production of alloys. Some important alloys are: brass (Cu, Zn), bronze (Cu, Zn, Sn, or Al )

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OCCURRENCE In nature, it is found as compounds and in elemental form. The most important copper minerals are chalcopyrite (copper pyrite) (Cu . FeS2), chalcocite (Cu2S), agurite (CuCO3–Cu(OH)2), cuprite (Cu2O) and malachite (CuCO3 .Cu(OH)2).

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Chemical properties Copper is a less active metal than hydrogen. That's why it doesn't react with water, HCl, diluted H2SO4 or other acids.

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Compounds of Copper Copper has +1 and +2 charges in its compounds. Ions with +1 are called copper (I) or cuprous, and ions with +2 are called copper (II) or cupric. The most important cuprous compounds are: copper (I) oxide (Cu2O), and copper (I) chloride (Cu2Cl2), and those of cupric compounds are copper (II) chloride (CuCl2), and copper (II) sulfate (CuSO4).

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ZINC Zinc is the first member of group 2B. Zinc takes +2 oxidation state in its compounds. Zinc is a bluish-white metal The density of zinc is 7.14 g/cm3. Melting point is 419.5°C and boiling point is 907°C

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OCCURRENCE Zinc is not found in elemental form in nature. It is found as compounds, such as zincblende (ZnS), willemite (Zn2SiO4 . H2O), smithsonite or calamine (ZnCO3), and franklinite (ZnO .Fe2O3) in crustal rocks.

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CHEMICAL PROPERTIES

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Chromium is the first member of group 6B. Chromium is the first member of group 6B. Pure chromium is grey in color, hard and bright like silver. The melting point is 1907°C, the boiling point is 2671°C and its density is 7.19 g/cm3 at room temperature.

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OCCURRENCE The percentage of chromium is about 0.14% by mass in the earth’s crust. The most important mineral of chromium is chromite (FeO . Cr2O3), which has a brownish-black color.

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CHEMICAL PROPERTIES The main oxidation states of chromium are +2, +3 and +6, but it may exist from +1 to +6 oxidation states. Powdered chromium is more active. It may be reacted easily with NO3– and SO42– compounds, and with O2 gas.

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1. Chromium metal reacts with halo-acids, such as HCl and HBr, slowly. 1. Chromium metal reacts with halo-acids, such as HCl and HBr, slowly.

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COMPOUNDS 1)Chromium (III) Oxide, Cr2O3 Chromium (III) oxide is a green colored powder.

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2) Chromium (VI) Oxide, CrO3 Chromium (VI) oxide is a red colored solid that melts at 197°C. It is a powerful oxidizing agent

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3. Chromates (CrO42–) and dichromates (Cr2O72– ) 3. Chromates (CrO42–) and dichromates (Cr2O72– ) Chromates of alkali metals, magnesium and calcium are soluble in water. Soluble chromates have usually yellow color.

Теги Inert metals

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