C3 OCR

C3

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  • Created by: xfirereg
  • Created on: 02-05-16 18:33
What do tectonic plates float on?
The tectonic plates are floating on top of the mantle (molten rock)
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Why has Britain been located on different parts of the surface of the Earth?
Most tectonic plates move at speeds of a few cm per year. This means Britain today was at a different location on the surface of the Earth
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List three processes by which minerals are formed
Sedimentation, dissolving, evaporation, erosion and mountain building
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What is coal made from?
Coal consist mainly of carbon. Coal formed over millions of years by the fossilisation of layers of plant matter
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where is salt mined in the UK?
In the UK, salt is extracted from underground deposits. - Evaporation
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What is rock salt?
A mixture of salt and impurities found in underground deposits
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Three methods of obtaining salt industrially
1) Salt Mining 2) Solution Mining 3) Evaporating seawater
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What is a food preservative?
A food preservative is something added to foods to give them longer life before they go 'off' due to mould, bacteria etc.
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What is the main health concern associated with too much salt?
Eating too much salt can cause high blood pressure which could lead to strokes and heart attacks
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Name the three products of brine electrolysis
1) Chlorine 2) Hydrogen Sodium Hydroxide
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Two uses of chlorine
1) killing bacteria 2) disinfectants
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How is bleach made?
Reacting chlorine with sodium hydroxide
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Two toxic chemicals used in large-scale brine electrolysis
1) Mercury 2) Asbestos
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Why is chlorine added to water supplies?
It kills disease-causing microorganisms
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What is an alkali?
An alkali is a compound that dissolves to give a solution with a pH higher than 7
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Name three chemicals that are alkalis (Alkalis include soluble hydroxides and carbonates)
Sodium hydroxide, Potassium hydroxide, Calcium carbonate
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Products of reaction between calcium carbonate and sulfuric acid?
Calcium Sulfate + Water + Carbon Dioxide
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Why are alkalis added to some soils?
To neutralise acidic soils
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What happens when chemicals like DDT get into rivers?
kills of animals such as otters
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What does LCA stand for?
Life Cycle Assesment
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4 stages needed to be considered when doing an LCA
Choices of material, Manufacturing, Using the product, Product Disposal
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Other cards in this set

Card 2

Front

Why has Britain been located on different parts of the surface of the Earth?

Back

Most tectonic plates move at speeds of a few cm per year. This means Britain today was at a different location on the surface of the Earth

Card 3

Front

List three processes by which minerals are formed

Back

Preview of the front of card 3

Card 4

Front

What is coal made from?

Back

Preview of the front of card 4

Card 5

Front

where is salt mined in the UK?

Back

Preview of the front of card 5
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