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Chemistry Core > Alkenes and Ethanol > Flashcards

Alkenes and Ethanol Flashcards

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1
Q

What is the bond of an Alkene

A

Double CC

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2
Q

Are alkenes Unsaturated or Saturated

Why?

A

Unsaturated

The double C bonds can open up to make new bonds

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3
Q

What are the first 3 Alkenes

A

Ethene

Propene

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4
Q

What is the structure of Ethene

A

H H

      C=C

H H

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5
Q

What is the structure of Propene

A

H H H

H C-C=C

  H              H
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6
Q

Explain the test for an alkene

A

Add substance to Bromine Water

The alkene will de colourise the bromine water taking it from orange to colourless

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7
Q

Explain why the test for Alkenes changes from Orange to colourless

A

Double bond has opened up and formed bonds with the Bromine

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8
Q

What is the formula for Ethene

A

C H

2 4

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9
Q

What is the formula for Propene

A

C H

3 6

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10
Q

What do we react Ethene with to get Ethanol

A

Steam

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11
Q

What is the process of turning Ethene to Ethanol

A

Hydration with Steam

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12
Q

Explain making Ethanol from Ethene

A

Hydrate Ethene with steam in the presence of a catalyst

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13
Q

What is an advantage of using the hydrating method to make ethanol

A

Cheap because Ethene’s cheap and not much is wasted

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14
Q

What is a disadvantage if using the hydrating method to make ethanol

A

Ethanol is produced from crude oil; this makes it non-renewable and so it will become expensive as resources start to run out

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15
Q

What is the alternative method to using hydration

A

Fermentation

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16
Q

What is the word equation for Fermentation

A

Sugar-> Carbon Dioxide + Ethanol

17
Q

How does Fermentation work

A

Convert sugar into Ethanol using yeast

18
Q

What do you need for fermentation

A

Lower Temperatures

Simpler Equipment

19
Q

What are 2 advantages of using Fermentation

A

Renewable as sugar is grown in many parts of the world

Can be used as a cheaper fuel in countries that don’t have oil reserves for making petrol

20
Q

What is a disadvantage of using Fermentation

A

Isn’t very concentrated so you still have to distil and purify it to increase its strength

21
Q

What is the rule to find the formula of n Alkene

A

C H

n 2n

Chemistry Core (17 decks)

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