Alkanes and Alkenes

HideShow resource information
  • Created by: Meggan
  • Created on: 24-09-13 21:19
What's a hydrocarbon?
Molecules containing hydrogen and carbon atoms ONLY
1 of 20
What are 3 features of a homologous series?
1) same general formula 2) trends in physical properties 3) same chemical properties
2 of 20
What does saturated mean?
SINGLE bonds
3 of 20
What sort of bonds do alkenes have?
Double covalent bonds
4 of 20
Which are more reactive; alkanes or alkenes?
Alkenes - double bond can be 'opened up'
5 of 20
General formula for alkanes?
Cn H2n+2
6 of 20
General formula for alkenes?
Cn H2n
7 of 20
What is an Isomer?
Something with the same molecular formula, but different structual forumla
8 of 20
What 2 reactions do alkanes do?
1) Combustion 2) Substitution reactions
9 of 20
What products are made in complete combustion? (plenty of oxygen)
Carbon dioxide and water (+lots of energy)
10 of 20
What products are made in incomplete combustion? (little oxygen)
Carbon, carbon monoxide, carbon dioxide, water (+little energy)
11 of 20
Where do alkanes get their energy from in substitution reactions?
U.V. light
12 of 20
What are the products of reacting methane with the halogen bromine?
Bromomethane + hydrogen bromide
13 of 20
What sort of reactions do alkenes undergo?
Addition Reactions
14 of 20
What product do you get when reacting ethene and bromine?
1,2 - Dibromoethane
15 of 20
What's the test for alkenes?
Decolourising bromine water from reddish-brown to colourless
16 of 20
Why do we crack hydrocarbons?
To get shorter hydrocarbon chains as they are more useful
17 of 20
What sort of reaction is cracking?
Thermal Decompositon
18 of 20
What conditions are needed for cracking?
600-700 degrees C, and a catalyst e.g. alumina or silica
19 of 20
How do you pass the large hydrocarbons over a catalyst in cracking?
Vaporise them
20 of 20

Other cards in this set

Card 2

Front

What are 3 features of a homologous series?

Back

1) same general formula 2) trends in physical properties 3) same chemical properties

Card 3

Front

What does saturated mean?

Back

Preview of the front of card 3

Card 4

Front

What sort of bonds do alkenes have?

Back

Preview of the front of card 4

Card 5

Front

Which are more reactive; alkanes or alkenes?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Organic Chemistry resources »