Key Area 1: Homologous Series

Question 1

Burning =

Answer 1

Combustion

Question 2

Fuels

Answer 2

Substances that can be burned to produce energy. Produce energy for heat and light transport.

Question 3

When a substance burns it combines with?

Answer 3

Oxygen

Question 4

A homologous series is a group of compounds that…

Answer 4

1. Can be represented by a general formula
2. Have similar chemical properties
3. Show gradual change in physical properties such as boiling and melting points

Question 5

Alkanes are

Answer 5

Commonly used as fuels

Insoluble in water

Question 6

General formula of Alkanes

Answer 6

Cn H2n +2

Question 7

Compounds containing only single carbon - carbon bonds (c-c) are described as

Answer 7

Saturated

Question 8

As the molecular size increased

Answer 8

Their melting and boiling points increase

Question 9

Alkenes. If they contained at least one carbon - carbon double bond (c=c) described as

Answer 9

Unsaturated

Question 10

General formula of Alkene

Answer 10

Cn H2n

Question 11

Isomers

Answer 11

Compound with the same molecular formula but different structural formula

Question 12

Cycloalkanes are a homologous series of

Answer 12

Saturated cyclic hydrocarbons

Question 13

General formula of Cycloalkanes

Answer 13

Cn H2n

Question 14

Examples of isomers

Answer 14

Cycloalkanes and alkanes

Question 15

Fuel oil and gasoline are mixtures of

Answer 15

Alkanes and Cycloalkanes

Question 16

Cycloalkanes are used as

Answer 16

Fuels and solvents

Question 17

Alkanes, alkenes and Cycloalkanes all take part in

Answer 17

Combustion (they all burn)

Question 18

Alkenes are more

Answer 18

Reactive

Question 19

Alkenes undergo

Answer 19

Addition reactions

Question 20

Definition of addition reaction (hydration reactions)

Answer 20

One in which two or more molecules join to produce a single larger molecule and nothing else

Question 21

Test for unsaturation

Answer 21

Presence of unsaturatiob in organic compounds are shown using brine solution

It has a red/orange colour but if shaken with an unsaturated hydrocarbon the bromine molecules add on across the carbon to carbon double bonds and the reaction turns rapidly colourless

Question 22

Insoluble =

Answer 22

Immiscible

Question 23

All hydrocarbons are … in water

Answer 23

Immiscible

Question 24

Main component of a natural gas?

Answer 24

Methane

Question 25

Elements present in hydrocarbons

Answer 25

Hydrogen and Carbon

Question 26

Ethene is made by a process known as

Answer 26

cracking

Question 27

Hydration is adding??
Creates??

Answer 27

Water (H20, H and OH)
Creates an alcohol

Question 28

Hydrogenation is adding?
Creates?

Answer 28

Adding hydrogen (H, H)
Creates an alkane

Question 29

Halogénation is adding??
Creates??

Answer 29

A halogen (Br, I etc.)
Creates a dihaloalkane

Question 30

A hydrocarbon is?

Answer 30

A compound that contains ONLY hydrogen and carbon

Question 31

The more branches the molecule has?

Answer 31

The lower the boiling point