C1 Cracking, polymers and ethanol Flashcards

1
Q

What process is used to break larger hydrocarbon molecules into smaller one?

A

Cracking

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2
Q

Describe this process.

A

Vaporise the hydrocarbon and pass over a hot aluminium oxide catalyst

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3
Q

What is a hydrocarbon?

A

Compound made from only carbon and hydrogen

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4
Q

What are the products of cracking?

A

Smaller alkanes and alkenes

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5
Q

What is a catalyst?

A

Something that speeds up a reaction without being used up

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6
Q

Give 3 uses of the products of alkenes.

A

Fuels, plastics, ethanol

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7
Q

Give the general formula of alkenes.

A

CnH2n

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8
Q

Are alkenes saturated or unsaturated?

A

Unsaturated

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9
Q

How can you test for unsaturation?

A

Bromine water is decolourised

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10
Q

What is the formula for ethene

A

C2H4

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11
Q

Draw a propene molecule.

A
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12
Q

What special feature does an alkene contain?

A

Double bond

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13
Q

What do you see if bromine is added to ethene?

A

Goes from orange to colourless

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14
Q

What is a monomer?

A

An alkene

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15
Q

What is a polymer?

A

Many monomers joined together

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16
Q

Give the reaction for the polymerisation of ethene?

A
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17
Q

Name the product for the polymerisation of ethene?

A

Polyethene

18
Q

Give the reaction for the polymerisation of propene?

19
Q

What feature do polymers not have that the monomers do?

A

Double bonds

20
Q

Polymers have many new uses, give 2 examples.

A

Hydrogels in nappies and waterproof coating like Gore-tex

21
Q

Many polymers are not biodegradable, what does this mean?

A

Don’t break down

22
Q

Give 2 problems with polymers not being biodegradable.

A

Fill up landfill sites and produce litter

23
Q

Some plastic bags are made from cornstarch polymer why is this useful?

A

Renewable and biodegradable

24
Q

List 3 ways in which polymers are disposed of.

A

Incineration, landfill and recycle

25
Give an advantage and disadvantage for incinerating polymers.
Give out energy Give out carbon dioxide which leads to global warming
26
Give an advantage and disadvantage for putting polymers in landfills.
Easy Don’t biodegrade so they get filled up
27
Give 3 advantages of recycling polymers.
Less waste in landfills Not wasting a non-renewable resource Less pollution produced and energy used
28
Give 2 disadvantages of recycling polymers.
Collecting and sorting Transportation
29
Give a word equation for the production of ethanol through fermentation.
Glucose + water → ethanol
30
Describe the process of fermentation.
Add sugar and yeast to warm water in the absence of oxygen
31
Describe another method of making ethanol
Reacts ethene with steam
32
Give a symbol equation for the reaction of ethene and steam.
C2H4 + H2O → C2H5OH
33
If ethanol is combusted what are the products?
Carbon dioxide and water
34
How much ethanol is produced in fermentation?
Less than 15%
35
Which process of making ethanol is continuous?
Ethene method
36
Which process of making ethanol uses non-renewable raw materials
Ethene method
37
Which process of making ethanol is completed in batches?
Fermentation method
38
Which process produces pure ethanol?
Ethene method
39
Give advantages and disadvantages for the fermentation method
cheap raw material Renewable plant material Low temperature batch method so slow Impure ethanol
40
Give advantages and disadvantages for the ethene method
pure ethanol fast uses non-renewable fossil fuels high energy costs