Homologous series

Question 1

What is a isomer?

Answer 1

Compounds that have the same molecular formula but different structural formula

Question 2

Whats the use of copper can in a combustion experiment

Answer 2

Better heat transfer

Question 3

Whats a hydroxyl?

Answer 3

OH

Question 4

Mp and bp of alkanes

Answer 4

have very weak attractions between their molecules
-have very low melting & boiling points
-are volatile, flammable and runny
are insoluble in water.

Question 5

Mp and bp of alkenes

Answer 5

-very weak attractions between their molecules
-are insoluble in water
-have very low melting & boiling points
are volatile, flammable and not runny

Question 6

Whats a carboxyl?

Answer 6

COOH

Question 7

Facts about cycloalkanes

Answer 7

• burn to give CO2 and H2O on complete combustion
• saturated because they contain single C—C bonds
• can’t decolourise bromine water immediately

Question 8

How is a alkanol made

Answer 8

Water + alkene

Question 9

Uses of carboxylic acids

Answer 9

Soaps
Preservatives
Medicines
Vinegar(ethanoice acid)

Question 10

What is the homologous series?

Answer 10

group of compounds with:

• similar chemical properties
• the same general formula
• a gradual change in physical properties(melting and boiling point.)

Question 11

General formula for alkenes?

Answer 11

CnH2n

Question 12

Advantages of bioethanol

Answer 12

Renewable source of energy
Carbon neutral releases co2 when burned
But crops take in co2 during photosynthesis

Question 13

Facts about the alkane family.

Answer 13

• The simpler alkanes are mainly used as fuels
• burn to give carbon dioxide and water on complete combustion
• saturated because they contain only single C—C bonds
• cant decolourise bromine water immediately .

Question 14

What is used in a combustion experiment?

Answer 14

Insulation 
Thermometer
Alkanol burner
Copper can
Volume

Question 15

What is combustion(burning)

Answer 15

when a substance reacts with oxygen

Question 16

Whats the use of insulation in a combustion experiment

Answer 16

To stop heat loss

Question 17

General formula for alkanes

Answer 17

CnH2n + 2

Question 18

Properties of alcahols

Answer 18

• molecule size increases,bp increases due to stronger intermolecular forces of attraction
• molecule size increases,solubility decreases

Question 19

Name the addition reactions alkenes go through

Answer 19

Hydrogenation (addition of hydrogen)
Hydration(addition of water)
Bromination(addition of bromine)

Question 20

Name the three homologous series families

Answer 20

Alkanes
Alkenes
Cycloalkanes

Question 21

What is Fermentation ?

Answer 21

process in which ethanol is made from plant materials.
Glucose breaks down
Ethanol burned for energy

Question 22

Combustion in hydrocarbons

Answer 22

If theres enough oxygen, combust to form water and carbon dioxide

Question 23

What is cracking?

Answer 23

• process where longer hydrocarbin chains break down into smaller ones
• alumunium oxide is usually the catalyst

Question 24

Facts about the alkene family

Answer 24

• burn to give carbon dioxide and water on complete combustion
• unsaturated because they contain a double C = C bond
• C = C bond makes alkenes more reactive than alkanes.
• decolourise bromine water immediately on mixing