C1 - Products From Oil Flashcards Preview

GCSE Chemistry > C1 - Products From Oil > Flashcards

Flashcards in C1 - Products From Oil Deck (25)
Loading flashcards...
0

How are smaller hydrocarbons made and why?

Large hydrocarbons are broken down by mixing them with steam and heating or passing the vapours over a hot catalyst. This is done because smaller hydrocarbons are more useful.

1

What reaction takes place in cracking?

Thermal decomposition

2

What is the formula for alkenes?

CnH2n

3

What is an alkene?

An unsaturated hydrocarbon

4

What bonds do alkenes have that alkanes don't?

Double bonds

5

What test is used to distinguish an alkene from an alkane?

If bromine water turns colourless, the compound is an alkene.

6

What is a monomer?

Small molecules that are a product of crude oil.

7

What is a polymer?

A molecule made up of many monomers,

8

What is polymerisation?

The joining of monomers. The double bonds are broken and form bonds with other monomers to form polymers.

9

What are smart polymers?

Materials that can change their properties according to light, heat, etc.

10

Give three examples of how smart polymers can be used in medicine.

-Easy-peel plasters
-Hydrogel
-Shape memory

11

What are the problems with disposing of plastics?

-Piles of unsightly rubbish
-Damage wildlife
-Take up landfill space

12

What is a biodegradable plastic?

The plastic can be decomposed by microbes.

13

How can polymers be made biodegradable?

Starch can be used in production.

14

Give an example of a biodegradable plastic.

PLA ( Poly(lactic acid))

15

Give two advantages of using biodegradable plastics.

-Crude oil can be preserved.
-There is less impact on the environment.

16

Give two disadvantages of using biodegradable plastics.

-Wildlife habitats could be destroyed to make farmland.
-The corn is used to make plastic rather than feed people.

17

What are the two main methods of making ethanol?

-Hydration
-Sugar fermentation

18

What is hydration in ethanol production?

Reacting steam with ethene with a catalyst.

19

What is the equation for producing ethanol by fermentation?

Sugar --yeast--> ethanol + carbon dioxide

20

What is the symbol equation for producing ethanol using sugar fermentation?

C6H12O6 ----> 2C2H5OH + 2CO2

21

What is the equation for producing ethanol using hydration?

Ethene + steam --catalyst--> ethanol

22

Give two advantages of producing ethanol by hydration.

-The process is continuous
-There is no waste product

23

Give two disadvantages of using fermentation to produce ethanol.

-The production is a batch process so takes a long time.
-The process releases carbon dioxide.

24

Give a disadvantage of producing ethanol by hydration.

-Using ethene relies on crude oil which is non-renewable