Chemistry G-H

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  • Created by: Lilly
  • Created on: 09-11-14 20:06
What are the properties of Metals?
• Lustrous (shiny), hard and high density • High tensile strength – can be stretched and shaped without losing its strength • High melting and boiling points • Good conductors of heat and electricity
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What does it mean if metal has a high tensile strength?
They resist being stretched
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Name the bonds found in metal
Metallic bonds
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Describe Metallic Bonding
Metallic bonding is the strong force of attraction between the sea of delocalised electrons and the closely packed positive metal ions.
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Describe why metals can conduct electricity:
Because metals have positive ions, which then the electrons are free to flow around, this forms delocalised electrons which then produce electricity.
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Explain why metals have a high melting point
Because it takes a lot of energy to overcome the delocalised electrons and metal ions.
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How are the particles arranged in a metal?
Particles in solid metals are packed closely together in a regular arrangement.
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What is a superconductor?
Metal that has a very low (almost zero) electrical resistance
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What are three potential benefits of superconductors?
• Loss free power transmissions • Super-fast electronic circuits • Powerful electromagnets
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Explain why metals have high boiling points
Metals have a high boiling point, because even more energy is used to break the metallic bonds than when melting a metal
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What are the drawbacks of superconductors?
* Superconductors only work at very low temperatures * The need for very low temperatures means that the applications of superconductors are limited.
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Why is it important to conserve water?
Fresh water is a limited resource. About 97% of the water on planet is salt water, so it is important to conserve fresh water.
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Name four types of water resources found in the UK:
• Lakes • Rivers • Reservoirs • Aquifers
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State three uses of water in industrial chemical processes:
• A solvent to dissolve other substances • A coolant to stop overheating happening • A cheap raw material
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Where do pollutants like nitrate come from?
Nitrate pollutants can come from fertiliser that runs off the fields.
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Where do pollutants like lead come from?
Lead pollutants come from old lead pipes.
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Where do pollutants like pesticides come from?
Pesticides from spraying crops in the fields close to water resources.
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Name the three main processes involved in water purification:
* Sedimentation * Filtration * Chlorination
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Explain the three main processes involved in water purification:
• Sedimentation - Removes large suspended particles • Filtration - Removes small suspended particles • Chlorination - Kills microbes in the water, helping to prevent disease.
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Explain the drawback of distilling sea water in large amounts
A lot of energy is needed to do this. It is usually too expensive to make large amounts of water this way.
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Why are some soluble substances are not removed during the purification process?
Some soluble substances may not be removed because they may be poisonous, so strict limits are placed on how how much of them can be in the water.
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What substances may water contain before it is purified?
* Dissolved salts and minerals. * Microbes. * Pollutants. * Insoluble Materials.
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What is Barium chloride solution used for?
Barium chloride solution is used to test water for dissolved \sulfate ions, it will form a white precipitate.
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What is Silver nitrate solution used for?
It is used to test for dissolved halide ions.
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What are the colours when testing for halide ions?
Chloride = White precipitate. Bromide = Creamy precipitate. Iodine = Pale yellow precipitate
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What is the balanced symbol equation for sodium sulfate solution with Barium chloride solution?
Balanced Symbol equation =
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What is the balanced symbol equation for sodium chloride solution with silver nitrate solution?
Balanced Symbol equation =
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What is the word equation for Lithium chloride mixed with silver nitrate?
Word Equation =
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What is the word equation for Lithium sulphate and barium chloride?
Word Equation =
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Other cards in this set

Card 2

Front

What does it mean if metal has a high tensile strength?

Back

They resist being stretched

Card 3

Front

Name the bonds found in metal

Back

Preview of the front of card 3

Card 4

Front

Describe Metallic Bonding

Back

Preview of the front of card 4

Card 5

Front

Describe why metals can conduct electricity:

Back

Preview of the front of card 5
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