AQA · Chemistry · 8462
GCSE Chemistry (AQA): Separating Metals from Metal Oxides
Topic 4 — Chemical Changes. Generated from the caption track of Cognito's lesson video "GCSE Chemistry - Separating Metals from Metal Oxides | Extraction of Metals & Reduction"; each card deep-links to the moment in the video it came from. Lesson 4.08 of Cognito's AQA GCSE Combined Science (Trilogy) and Chemistry course (Higher tier), filed under AQA Chemistry 8462. Teaching by Cognito — https://cognitoedu.org/coursesubtopic/c2-gcse-aqa-h-c_4.08.
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What is the common name for iron oxide formed when iron reacts with air?
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Rust.
Define oxidation in terms of oxygen.
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The gaining of oxygen by a substance.
What is an ore?
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A metal-rich compound (rock) from which a metal can be extracted.
The most common iron ore is ?, a type of iron oxide.
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Fe2O3
Which cheap substance is used to reduce metal oxides to pure metals?
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Carbon — it takes the oxygen from the metal oxide, forming carbon dioxide.
In copper oxide + carbon → copper + carbon dioxide, which substance is oxidised?
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The carbon, because it gains oxygen.
Why is gold found in the Earth as a pure metal?
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It is too unreactive to react with oxygen, so it does not form an oxide.
Define reduction in terms of oxygen.
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The loss of oxygen from a substance.
In copper oxide + carbon → copper + carbon dioxide, which substance is reduced?
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The copper oxide — the copper loses oxygen.
Which metals can be extracted from their oxides by reduction with carbon?
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Metals less reactive than carbon, e.g. zinc, iron and copper.
How are metals more reactive than carbon extracted from their ores?
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By electrolysis, which uses a lot of energy and is therefore expensive.
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