Chemistry Unit 2

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  • Created by: jenni2906
  • Created on: 13-05-15 18:03
Benefits of recycling?
Plastic is heated then moulded into new shape, polymer chains in plastic have weak intermolecular forces that allow polymer chains to become mobile when heated.
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Graphite.
Weak intermolecular forces so layers can slide.
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Why does graphite conduct electricity?
Has delocalised electrons which carry current. Diamond has no delocalised electrons.
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What is Co2?
Simple molecule. Has weak intermolecular forces.
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Where is the mixture separated in gas chromatography?
The column.
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Where is the relative molecular mass measure in gas chromatography?
Mass spectrometer.
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What is thermosoftening?
Chains with weak intermolecular forces that are weak and easily broken when heated.
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Why is the chromatography line drawn in pencil?
Because ink dissolves in the solvent.
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What does mass spectroscopy do?
Identifies solvents.
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What does the molecular ion peak do?
Gives the relative molecular mass of the molecule.
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What is the diamond giant structure?
Strong bonds between carbon. Covalent bonds. Each carbon forms four bonds.
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What does the mass spectrometer do?
give the relative molecular mass of a substance.
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Why can this question not be answered by science alone?
Based on opinion. Cannot be determind by experiment.
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What is silicon dioxide?
Covalent giant structure. High melting point, lots of energy needed to break bonds.
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Why is there not a 100% yield?
It is a reversible reaction.
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What is ammonium nitrate?
A fertiliser.
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How do you work out one mole of a substance?
Mass divided by relative formula mass.
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Why do thermosoftening polymers melt?
There are no cross links.
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Why does mixture rise when baked?
Gas is produced.
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What does cryolite do in electrolysis?
Lowers the melting point so less energy is needed to melt it.
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What does hydroxide do?
Makes waste alkaline.
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What is the reaction between aqueous ammonia solution and an acid?
Neutralisation reaction.
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What produces ammonium nitrate?
Nitric acid.
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What are the properties of a giant structure?
Electrostatic forces, oppositely charged ions, high melting points.
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Gold is the only catalyst for some reactions. Why?
Catalysts are not used up, improves speed of reaction.
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When can't current flow?
When the ions can't move.
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Why are alloys harder than pure metals?
Alloys are different so layers are distorted so don't slide.
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Why can metals conduct electricity?
They have delocalised electrons that can move in the metal and carry the current.
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Properties of simple molecular substances?
Low boiling point, weak intermolecular forces, less energy needed.
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Other cards in this set

Card 2

Front

Graphite.

Back

Weak intermolecular forces so layers can slide.

Card 3

Front

Why does graphite conduct electricity?

Back

Preview of the front of card 3

Card 4

Front

What is Co2?

Back

Preview of the front of card 4

Card 5

Front

Where is the mixture separated in gas chromatography?

Back

Preview of the front of card 5
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