Unit 2 Topic 5 Organic Flashcards Preview

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Flashcards in Unit 2 Topic 5 Organic Deck (36):
1

What is a homologous series?

A family of organic compounds

2

What 4 things does each member of a homologous series have in common?

- Same general formula
- Each member differs by a CH2 group
- They have similar chemical properties
- Gradual change in physical properties as number of Carbon atoms increases

3

Give 4 homologous series?

Alkanes
Alkenes
Carboxylic Acids
Alcohols

4

Give 4 Alkanes?

Methane
Ethane
Propane
Butane

5

Give molecular formula of the first 4 Alkanes?

Methane CH4
Ethane C2H6
Propane C3H8
Butane C4H10

6

What is combustion?

The reaction of a fuel with oxygen

7

Give the word equation for complete combustion?

Fuel + Oxygen ---> Carbon Dioxide + Water + Energy

8

Give the word equation for incomplete combustion?

Fuel + Little Oxygen ---> Carbon Monoxide + Water + Energy

9

Give 2 alkenes and their molecular formula?

Ethene C2H4
Propene C3H6

10

How to distinguish between an alkene and Alkane?

Alkane in bromine water stays brown, but an alkene in bromine water turns the solution colourless

11

What is the functional group in an alkene?

The double bond between 2 carbon atoms

12

What states are ethene and propene at at room temperature?

Gas

13

Why are alkenes described as unsaturated molecules, while Alkanes described as saturated?

Alkenes are unsaturated because they can still bond with another substance, however Alkanes cannot

14

What are polymers?

Large organic molecules formed when smaller molecules form together in a long chain

15

What is addition polymerisation?

The process of adding monomers together to make a polymer

16

What is a monomer?

The small molecules that add together to form a polymer

17

Give 3 properties of polythene?

Light
Flexible
Resistant to acidic or alkaline conditions

18

Give 2 uses of polythene?

Cling film
Bottles

19

Give 3 properties of PVC?

Tough
Waterproof
Good insulator

20

Give 2 uses of PVC?

Electric cables
Umbrellas

21

Give 2 benefits of plastics?

Extremely long lasting
Excellent insulation properties

22

Give 2 methods of plastics disposal?

Landfill
Incineration

23

Give an advantage of using landfill to dispose of plastics?

Landscape can be re landscaped after use

24

Give a disadvantage of using landfill to dispose of plastic?

Wastes land

25

Give an advantage of using an incinerator to dispose plastics?

Heat energy can generate electricity

26

Give a disadvantage of using incineration to dispose plastics?

Ash residue is toxic

27

Give 2 alcohols and their molecular formula?

Methanol CH3OH
Ethanol C2H5OH

28

Give word equation for fermentation?

Glucose ---> Carbon dioxide + Ethanol
C6H12O6 ---> 2CO2 + 2 C2H5OH

29

Give 2 uses of ethanol?

Alcoholic beverages
Fuel

30

Give use of potassium dichromate?

Breathalysers

31

What colour change occurs with potassium dichromate when ethanol is present? Why?

Orange to Green

This is because the Potassium Dichromate oxidises the ethanol and converts it in to ethanoic acid

32

Give 2 carboxylic acids and their molecular formula?

Methanoic acid HCOOH
Ethanoic Acid CH3COOH

33

What state are carboxylic acids at room temperature?

Liquid

34

What state are alcohols at room temperature?

Liquid

35

Give 2 uses of ethanoic acid?

Flavouring
Preservatives

36

Give 3 environmental concerns about the petro chemical industry?

Transport of crude oil can result in spillages
Drilling for crude oil can result in leaks
Air pollution due to release of combustion products in to atmosphere