1867406
Description
Flashcards by Tim Parker, updated more than 1 year ago
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Created by Tim Parker
almost 11 years ago
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| Question | Answer |
| Why is Pure Iron too soft | Atoms are arranged so that the layers slide |
| How is steel made | By removing carbon from molten iron |
| Property of Stainless Steel | Resistant to corrosion |
| Property of High Carbon Steel | Hard |
| Property of Low Carbon Steel | Easily Bent |
| What is an Alloy? | A MIXTURE OF TWO OR MORE ELEMENTS, WHERE AT LEAST ONE IS A METAL |
| Pure copper, iron, gold and aluminium are too ___ for many uses. | Soft |
| Is an alloy harder or softer than pure metal? | Harder |
| What properties do TRANSITION METALS have in common? | - Malleable (Can be hammered or bent into any shape) - They are metals - They are good conductors of heat and electricity |
| What is an ore? | A rock containing a metal |
| Why is gold found as itself? | Because it is too unreactive to extract |
| How are metals produced? | When metal oxides have their oxygen removed. |
| Metals ABOVE carbon in the reactivity series have to be extracted by what method? | Electrolysis |
| Metals BELOW carbon on the reactivity series are extracted by how? | By adding carbon |
| Reaction in which oxygen is removed is called? | Reduction Reactions |
| What term is the same as 'High Concentration of Copper Compounds'? | Copper-Rich |
| How to extract from Copper-Rich ores? | Smelting (Heating in a furnace) |
| What research are scientists doing to do with copper? | Trying to find 'low grade ores' to extract copper without damaging the environment |
| What is PHYTOMINING | When plants absorb copper compounds through their roots, then are burnt to produce ash that contains copper compounds |
| What is BIOLEACHING | Where some bacteria absorb copper compounds, then produce solutions called leachates which contain copper compounds |
| Properties of Copper? | - Soft -Easily bent - Good conductor of electricity - Good for wiring |
| What is copper good for? | - Plumbing, pipes and tanks because it does not react with water and is a good conductor of heat - Wiring because it is a good conductor of electricity |
| Why should we recycle Aluminium? | Less energy is needed to produce recycled aluminium than to extract it from its ore. Less damage to the environment |
| What is aluminium used for? | -Aircraft -Trains -Overhead power cables -Saucepans -Cooking Foil |
| What is titanium good for? | -Fighter aircraft -Artificial hip joints -Pipes in nuclear power stations |
| Is Aluminium Low Density, or High Density | Low Density (It is lightweight for its size) |
| Why does Aluminium and Titanium resist corrosion? | They have a very thing layer of their OXIDE on the surface, which stops air and water getting to the metal. |
| Why is Aluminium and Titanium expensive to extract? | -It cannot be extracted by reduction with carbon -The processes have many stages -Large amounts of energy needed |
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