C1 Metals 4.0 / 5 based on 2 ratings ? ChemistryMetals, metal ores and alloysGCSEAQA Created by: ColdAsteroidCreated on: 09-02-16 17:35 What are the four main ores needed to be known at GCSE? Iron, copper, aluminium and titanium 1 of 31 What kind of metals are found in their native state in the ground? Unreactive metals (eg/ gold) 2 of 31 Where are most metals most commonly found? In ores reacted with other elements 3 of 31 Give an equation for an ore. Iron + Oxygen --> Iron oxide 4 of 31 What are ores? Rocks with enough metal/compound. Economical to extract 5 of 31 What is iron used for? To make steel (eg/ for skyscrapers) 6 of 31 What is copper good for? Making wires (excellent conductor) 7 of 31 What is aluminium used for? Making aircraft frames (low density/mass) 8 of 31 What is titanium good for? Medical implants (strong and unreactive) 9 of 31 What is the common way of extracting iron? A displacement reaction 10 of 31 How does a displacement reaction work? React iron oxide w/ more reactive element=>removes oxygen 11 of 31 What element do we often displace with and why? Carbon because it's very cheap 12 of 31 What don't we use to extract iron? More expensive metals 13 of 31 Give the word equation for a reduction reaction. Iron(iii)oxide + carbon (+heat)--> Iron + carbon dioxide 14 of 31 Give the symbol eqn. 2FE2O3 + 3C (+heat)--> 4Fe +3CO2 15 of 31 Where does the reaction take place? In a blast furnace 16 of 31 Why is the cast iron from a blast furnace not so good? Contains impurites (eg/ carbon) => iron becomes brittle 17 of 31 How do we get rid of the impurities? Get rid of carbon->blow O2 to iron-> remove C as CO2 18 of 31 Pure iron is too soft to be useful. Why? Atoms in layers (regular)=> can slide over each other 19 of 31 What are alloys? Metals combined with another element, often a different metal 20 of 31 Why are alloys therefore harder than pure metals? Different sized atoms=>irregular=>layers can't slide=>harder 21 of 31 What is steel? An alloy of iron with carbon 22 of 31 What does low-carbon steel contain? Properties and what it is good for? Low carbon=>easily shaped, used for car bodies 23 of 31 Why is high-carbon steel very hard? Useful for? Lots of C atoms, irregular, prevents sliding (eg/ railway lines, bridges) 24 of 31 What are the properties of stainless steel? Uses? Alloy of C and Cr and Ni. Corrosion resistant, (eg/ cutlery, containers) 25 of 31 What is copper used for? Making wires 26 of 31 What are copper's properties? Good conductor heat and electricity. No reaction with water 27 of 31 How do we extract copper? Is it pure? Use a smelter to produce impure copper. 28 of 31 What are the problems with copper ores and extraction? Therefore what must we do? They are running out. We must find alternative sources. 29 of 31 What is phytomining? Soil has SMALL amount of copper. Plants absorb it. 30 of 31 How do we retrieve the copper? Burn the plants and get the copper from the ash 31 of 31
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