C1.5 Making Crude Oil Useful Flashcards Preview

GCSE Chemistry AQA > C1.5 Making Crude Oil Useful > Flashcards

Flashcards in C1.5 Making Crude Oil Useful Deck (20):
1

Describe the three steps of cracking

-The hydrocarbon is vaporised by heating it
-the vapour passes over a catalyst (aluminium oxide) at a very high temperature (400-700oC)
-The hydrocarbon splits apart

2

What two products are produced by cracking an alkane.

An alkane and an alkene

3

Describe the test for alkenes.

-React with bromine water
-Bromine water turns colourless

4

What does the term saturated mean?

Single bonds only

5

What does the term unsaturated mean?

Has one or more double bond(s)

6

Describe how ethanol is produced from ethene

Reacting with steam
in the presence of a catalyst

7

Name an advantage and disadvantage of using ethene to produce ethanol.

Advantage - ethanol is the only product.
Disadvantage - ethene comes from crude oil, which is non-renewable.

8

Write the word equation for the fermentation of sugar to produce ethanol

Sugar --> ethanol + carbon dioxide

9

Name an advantage and disadvantage of using fermentation to produce ethanol

Advantage - renewable, uses a low temperature and cheap equipment
Disadvantage - produces impure ethanol which needs to be distilled. Fermentation takes time.

10

What is a monomer

A single molecule which makes a polymer

11

What is a polymer

A long chain made from the same repeating molecule (monomer)

12

Name the polymer made from the polymerisation of ethene

Poly(ethene)

13

Name the monomer needed to produce the polymer, polychloroethene

Chloroethene

14

Describe the steps to extract oils from plants

-Plant material is crushed
-Oil is separated using a centrifuge
-Oil is refined using distillation

15

Name two uses of vegetable oils

Cooking
Use for biodiesel

16

Why are oils used for cooking

High boiling point
Adds flavour

17

Describe the process of hydrogenation

-Unsaturated vegetable oil is reacted with hydrogen
-with a nickel catalyst
-at about 60oC

18

Name a health effect of eating saturated fats, such as animal fats

Raises cholesterol levels in blood
Can cause heart disease

19

What is an emulsion?

Droplets of a liquid suspended in another liquid

20

Describe how an emulsion works

Emulsfier has a hydrophilic head and a hydrophobic tail
The hydrophilic end attracts water
The hydrophobic end attracts oil
This stops the mixture separating