Organic Chem

Question 1

What is the general formula for alkanes?

Answer 1

CnH2n+2

Question 2

What is the general formula for alkenes?

Answer 2

CnH2n

Question 3

Name 4 alkanes.

Answer 3

1. Methane
2. Ethane
3. Propane
4. Butane

Question 4

Name 3 alkenes.

Answer 4

1. Ethene
2. Propene
3. Butene

Question 5

Which is a saturated or unsaturated solution (alkane & alkene)

Answer 5

Alkane = saturated
Alkene = unsaturated

Question 6

Alkanes are generally unreactive except in?

Answer 6

Combustion & Substitution by chlorine

Question 7

1. What are the conditions for complete combustion?
2. State a reason for incomplete combustion?

Answer 7

1.Presence of excess oxygen
2. Limited supply of oxygen

Question 8

What are Hydrocarbons?

Answer 8

Organic compounds that contain only Carbon and Hydrogen bonds

Question 9

1. Define homologous series?
2. What are the characteristics of a homologous series

Answer 9

1. A group of organic compounds with the same functional group and similar chemical properties
2. • Same general formula
   • Similar chemical properties due to same functional group
   • Gradation in physical properties such as increasing b.p. and m.p., increasing viscosity, decreasing flammability.

Question 10

1. What is the functional group of alkenes?
2. What is the functional group of alcohol?
3. What is the functional group of carboxylic acid?

Answer 10

1. C=C
2. O-H
3. COOH

Question 11

1. What are the products formed from combustion reaction of alkanes?
2. What are the products formed from incomplete combustion reaction of alkanes?

Answer 11

1.CO2 & H20

2. Carbon Monoxide, CO & H20

Question 12

What are the conditions for substitution of alkanes by halogens?

Answer 12

Presence of ultraviolet (UV) light

Question 13

What is addition polymerisation?

Answer 13

Unsaturated monomers (alkenes) join together to form a very large molecule without losing any molecules or atoms

Question 14

What is a macromolecule?

Answer 14

A large molecule made up of many small molecules