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C1 Extracting metals
Edexcel C1 topic 4 Extracting Metals
Question | Answer |
---|---|
What is an ore? | Rocks that contain enough of a metal compound so that profit can be made when you extract the metal from the metal oxide |
"Aluminium + Oxygen --> Aluminium Oxide". What type of reaction is it? | Oxidation |
Name a metal that can be extracted by heating with Carbon | Zinc, Iron |
Name a metal that must be extracted by electrolysis | Aluminium, Sodium |
Name a metal that can be found native | Gold , Platinum |
Why can Iron be extracted by heating with Carbon? | because Iron is LESS reactive THAN Carbon (saying "Iron is not very reactive" is not enough) |
Why must Sodium be extracted by electrolysis? | because Sodium is MORE reactive THAN Carbon (saying "Sodium is very reactive" is not enough) |
"Aluminium + Iron Oxide --> Aluminium Oxide + Iron". What chemical is oxidised? | Aluminium |
"Aluminium + Iron Oxide --> Aluminium Oxide + Iron". What chemical is reduced? | Iron Oxide |
What type of compounds are found in metal ores? | Mostly Metal Oxides |
When you heat Tin Oxide with Carbon, you can extract Tin. Write the word equation. | Tin Oxide + Carbon --> Tin + Carbon Dioxide |
You get Aluminium when you electrolyse Aluminium Oxide. Write the word equation for the electrolysis of Aluminium Oxide. | Aluminium Oxide --> Aluminium + Oxygen |
Name the two methods to extract metals from their ores. | Heating with Carbon and Electrolysis |
Balance the following equation: __ PbO + __ C --> __ Pb + __ CO2 | 2 PbO + 1 C --> 2 Pb + 1 CO2 |
Balance the following equation: ___ Zn + ___ O2 --> ___ ZnO | 2 Zn + 1 O2 --> 2 ZnO |
State advantages of recycling metals | Saves natural resources (Ores will run out), saves energy (Recycling Aluminium uses only 5% of the energy needed to extract Aluminium fronm the Ore) |
State limitations of recycling metals | The energy used in sorting rubbish from the metals |
What does "malleable" mean? | Can be hammered into shape |
What does "ductile" mean? | Can be stretched into wires |
Why is Aluminium used for making the airplane frame? | Because Aluminium is not as dense as other metals, so the airplane will not be too heavy. Yet Aluminium is a fairly strong metal. |
Why is Copper used for making electrical cables? | Because Copper is one of the best conductors. |
Why is Gold used for jewellery? | Because Gold is shiny and STAYS shiny, as it does not react with Oxygen in the air. |
Why do not not use pure Iron for making bridges? What do we use instead? | Pure Iron is too soft. We use an ALLOY of Iron: steel |
Why do we use alloys of Gold for Jewellery rather than pure gold? | Pure Gold is too soft. We use an ALLOY of Gold |
Give a use for Aluminium and explain why Aluminium is used (rather than another metal) | Aluminium can be used for making the big electricity cables (the ones hung between pylones) because Aluminium is lightweight. Using a different metal would mean that the cables would be heavier. |
Give a use for Copper and explain why Copper is used (rather than another metal) | Water pipes because Copper is not very reactive, so Copper will not react with the water. |
What is an Alloy? | A MIXTURE of two metals (NOT a compound) |
Use the idea of particles to explain why pure metals are malleable. | In a Metal, particles are organised in a regular arrangement, because the particles are all the same size. When a force is applied a layer of particles can slide over the rest of the metallic structure |
Use the idea of particles to explain why pure alloys are stronger than pure metals. | In an Alloy, particles are different sizes so there is no regular arrangement. When a force is applied a layer of particles can NOT slide over the rest of the metallic structure |
What are the two metals making the alloy Nitinol? | Nickel and Titanium |
What is a smart Alloy? | An alloy that can go back to its original shape when you HEAT it up |
24-Carat gold is made of 100% Gold. How much Gold is there is an 18-Carat Gold? | 100/24*18=75% |
100% Gold is said to have 1000 parts per thousand fineness. How much Gold is there is a 250-fineness Gold? | 100/1000*250=25% |
Why is Aluminium used for making cans even when Aluminium is so reactive? | Aluminium reacts very quickly with Oxygen to form a thin layer of Aluminium Oxide. The Aluminium Oxide is NOT reactive. |
Why is Aluminium extracted by electrolysis but Iron extracted by heating with Carbon? | Because Aluminium is more reactive THAN CARBON, so the Carbon can not take away the Oxygen; but Iron is less reactive THAN CARBON, so Carbon can take away Aluminium (compare the reativity of metals TO CARBON) |
How many carats in pure gold? | 24 Carats |
What is the keyword that means "easy to shape" | Malleable |
Why should we recycle metals? | To save resources (Ores are a finite resource); to save energy (extracting metals spends more energy than recycling); to reduce CO2 emissions (less CO2 produced during recycling) ["to keep on re-using metals" does not explain} |
What should you say instead of "to save the environment";"to reduce pollution";"it is more eco-friendly" | State WHICH GAS is produced (CO2? SO2?) and how it affects the environment (Greenhouse? acid rain?) |
Which method would you use to extract Sodium from its ore? | Electrolysis (because Sodium is a metal more reactive THAN CARBON) |
Which method would you use to extract Iron from its ore? | Heating with Carbon (because iron is less reactive THAN CARBON) |
To make Iron, Iron Oxide is heated with Carbon Monoxide and Carbon Dioxide is formed. Write the word equation for the extraction of Iron. | Iron Oxide + Carbon Monoxide --> Iron + Carbon Dioxide |