Chemistry 1b

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  • Created by: deadarlia
  • Created on: 19-05-16 12:13
What is cracking ?
Cracking is the splitting up of long-chain hydrocarbons.
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Give a typical example of a substance that is cracked and the products that you get from cracking it.
Diesil is cracked to form PETROL, PARAFFIN and ETHENE for plastics.
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What kind of carbon-carbon bond do alkenes have ?
Double bond
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What is the general formula for alkenes ?
C2H4
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What are ploymers? What kinds of substances can form polymers?
Polymers are long-chain molecules. Ethene molecules can be joined up to produce poly(ethene).
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Give two factors which affects the physical properties of a polymer.
What it's made from and The tempreature and pressure.
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List four uses of polymers.
LYCRA , TOOTH FILLINGS , BIODEGRADABLE PACKAGING and MEMORY FOAM.
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Why might poolymers be more expensive in the future?
As crude oil recources get used up, the prices will rise.
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Why do some oils need to be distilled after they have been extracted?
To refine the oil and remove water, solvents and impurities.
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List two advantages of cooking with oil.
They provide a lot of energy and they contain essential fatty acids.
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What kind of carbon-carbon bond do saturated oils contain?
Double bonds.
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What happens when you react unsaturated oils with hydrogen?
They're hardened
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What is an emulsion? Give an example.
An emullsion is a substance that doesnt mix with other substances.
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How do emulsifiers keep emulsions stable ?
Then stop them from naturally seperating out.
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Suggest one problem with adding emulsifiers to food.
Some people are allergic to emulifiers.
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Give one reason why Alfred Wegners theory of continental drift wasn't accepted for a long time.
He used inacurate data in his calculations.
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What can be found beneath the earths crust?
Mantle
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Why can't scientists accurately pedict volcanoes and earthquakes ?
Tetonic plates can stay in place for a while and then suddenly lurch forwards and its impossible to predict when.
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Name the two main gasses that make up the earths atmosphere today.
Nitrogen and Oxygen
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Explain why todays atmosphere is different from the earths early atmosphere.
The earths surface was originoly molten so any atmosphere just "boiled away".
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What is meant by 'primordial soup'?
The primordial soup theory states that billions of years ago, the Earths atmosphere was rich in NITROGEN, HYDROGEN, AMMONIA and METHATNE.
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Other cards in this set

Card 2

Front

Give a typical example of a substance that is cracked and the products that you get from cracking it.

Back

Diesil is cracked to form PETROL, PARAFFIN and ETHENE for plastics.

Card 3

Front

What kind of carbon-carbon bond do alkenes have ?

Back

Preview of the front of card 3

Card 4

Front

What is the general formula for alkenes ?

Back

Preview of the front of card 4

Card 5

Front

What are ploymers? What kinds of substances can form polymers?

Back

Preview of the front of card 5
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