Metals and their uses 0.0 / 5 ? ChemistryMetals, metal ores and alloysGCSEAQA Created by: BusayoxoCreated on: 21-12-15 16:13 What is the definition of an ore? An ore contains enough metal to make it economic to extract the metal 1 of 21 What must happen to ores before the metal is extracted and purified? The ore must be mined and concentrated 2 of 21 Metals that are less reactive than carbon can be extracted from their oxides by? Reduction with carbon 3 of 21 Metals that are more reactive than carbon, such as aluminium are extracted by? Electrolysis 4 of 21 Why are metals that are extracted by electrolysis expensive? The use of large amounts of energy in extraction 5 of 21 Copper can be extracted from copper-rich ores by heating the ores in a furnace this is also known as? Smelting 6 of 21 How can the copper be purifed? By electrolysis 7 of 21 Phytomining and bioleaching are.. than smelting? More environmentally friendly 8 of 21 What is used in bioleaching to break the bonds of copper compound and make a leachate solution? Bacteria 9 of 21 What can be obtained from solutions of copper salts by electrolysis or by displacement using scrap iron? Copper 10 of 21 During electrolysis the positive metal ions move towards the negative electrode. Why does this happen? Because opposite charges attract 11 of 21 Why can't aluminium and titanium be extracted from their oxides by reduction with carbon? They are more reactive than carbon 12 of 21 What percentage of iron do Iron from the blast furnace contain? 96% 13 of 21 What makes iron brittle? Impurites 14 of 21 What is a steel? An alloy that contains mixtures of iron and carbon 15 of 21 What is a specific property of a low carbon steels? They are easily shaped 16 of 21 What is a specfic property of high carbon steels? They are hard 17 of 21 What is a specific property of stainless steels? They are resistant to corrosion 18 of 21 Pure copper, gold, iron, aluminium are too soft, what are these metals mixed with to make them harder? Small amounts of similar metals 19 of 21 What is the defintion of an alloy? A mixture of metals 20 of 21 Why are alloys stronger than pure metals? The metals are different sizes and therefore the layers cannot slide over each other 21 of 21
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