sc22, hydrocarbons (paper 2)

Question 1

define an alkane

Answer 1

homologous series of saturated hydrocarbons

Question 2

define saturated

Answer 2

atoms are linked only by single bonds

Question 3

what is the general molecular formula for an alkane

Answer 3

C n H 2n + 2

Question 4

what does the combustion/oxidation of an alkane produce

Answer 4

carbon dioxide and water

Question 5

state the word equation for the combustion/oxidation for an alkane

Answer 5

alkae + oxygen –> carbon dioxide + water

Question 6

define alkene

Answer 6

homologous series of unsaturated hydrocarbons

Question 7

what is the general molecular formula for an alkene

Answer 7

C n H 2n

Question 8

state the word equation for the combustion/oxidation for an alkene

Answer 8

alkene + oxygen –> carbon dioxide + water

Question 9

state the word equation for the reaction of an alkene with bromine

Answer 9

alkene + bromine –> colourless compound

Question 10

what does ethene reacting with bromine produce

Answer 10

dibromoethane

Question 11

define an isomer

Answer 11

compounds with the same molecular formula but a different arrangement of atoms

Question 12

how can you distignuish between an alkane and an alkene

Answer 12

• add a few drops of bromine water
• alkane stays orange
• alkene decolourises