chemistry 1.3.1 1.0 / 5 based on 1 rating ? ChemistryAcids, bases and saltsIGCSEAQA Created by: ambh0yleCreated on: 19-02-14 12:47 where are ores mined from? the ground 1 of 15 what do ores have to be before the metal is extracted and purified? it needs to be concentrated 2 of 15 what type of metals can we find in their native state? gold and other unreactive metals. 3 of 15 what changes whether a metal is worth extracting or not? how easy it is to extract it from its ore, how much metal the ore contains. 4 of 15 what does the reactivity series help us to decide? the best way to extract a metal from its ore. 5 of 15 metals that are less reactive than carbon are extracted how? from their oxides by reduction with carbon 6 of 15 how can metals be extracted? from compounds by displacement using a more reactive element. 7 of 15 what type of metals are extracted by electrolysis of molten compounds? Metals that are more reactive than carbon, such as aluminium. 8 of 15 how can copper be extracted from copper-rich ores? by heating the ores in a furnace (smelting) 9 of 15 what is phytomining? it uses plants to absorb metal compounds + the plants are burned to produce ash that contains the metal compounds. 10 of 15 what is bioleaching? it uses bacteria to produce leachate solutions that contain metal compounds. 11 of 15 How can copper be obtained from solutions of copper salts? by electrolysis or by displacement using scrap iron. 12 of 15 what metals cannot be extracted from their oxides by reduction with carbon? aluminium and titanium 13 of 15 why are current methods of extraction expensive? there are many stages in the processes, large amounts of energy are needed. 14 of 15 why should we recycle metals? because extracting them uses limited resources and is expensive in terms of energy and effects on the environment. 15 of 15
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