Students session

Organic and Inorganic Compounds SHS Int. Science lesson1 ; WASSCE Standard


Alkane, Alkene, Alkyne and Aromatic hydrocarbon

The lesson specifically follows the WASSCE syllabus, Don’t worry some few things might be missing but your science Teacher will fil the Gap in School. Use this as a Guide.

Organic and inorganic compounds


Hydrocarbons (first four members in each group), alkanols (methanol, ethanol, propanol), alkanoic acids (first two members), alkanoates (first two members), fats and oils. Functional groups, properties and uses of organic compounds.

Classification of chemicals as organic and inorganic

Differences between organic and inorganic compounds. Importance of organic chemistry in industrialization.

Neutralization And Esterterification.

Differences between neutralization and esterification. Equations representing neutralization and esterification reactions.


Sources, application and effects of petrochemicals on the environment. The refinery of crude oil. Uses of petrochemical such as plastics, pharmaceuticals and agrochemicals.

Sample past questions


Definition of keywords and all important Terms

Hydrocarbon; is a compound containing carbon and hydrogen only.

Saturated hydrocarbons; Are organic compounds containing carbon – carbon single bonds only.

Unsaturated Hydrocarbons; Are organic compounds which contain  carbon – carbon   double or triple bonds.

Functional Group; is an atom or group of atoms or a bond in an organic compound that gives the molecule its characteristic chemical properties.

Cracking;  is the breakdown of complex or large molecules of hydrocarbons by action of heat or a catalyst to produce small molecules.

Polymerization;  is the combination of small organic molecules (monomers) to form large molecules (polymers)

Saponification; is a reaction between fats or oil and hot concentrated alkali to form soap and glycerol.

Ester ; an Ester is an organic compound produced by the reaction between an organic acid or alkanoic acid and an alcohol or alkanol.

Isomerism; is the occurrence of compounds of the same molecular formular but different structural formular.

Detergent; they are cleaning agents

Or they are substances that have cleaning power and can remove dirt from objects or substances].


Plastics; are polymers of hydrocarbons which can be molded into shapes.

Fats ; are solid esters or lipids obtained from the reaction between glycerol and long chain fatty acids.

Organic compounds ;Organic compounds can be defined as compounds which contain hydrocarbon.

Sources of Organic compounds

  1. Petroleum (Crude Oil)

2. Natural Gas

3. Coal From plants and Animals

Examples of natural organic compounds

1. Carbohydrates

2. Protein

3. Vitamins

4. Enzymes

5. Hormones

6. Herbs

7. Fats and oils

Examples of artificial organic compounds

1. Plastic

2. Insecticides

3. Pesticides

4. Soap

5. Dyes

6. Drugs etc.

Types of organic compounds

i. Hydrocarbons

ii. Alkanol

iii. Alkanoic acids

iv. Alkanoates

v. Fats and oils.

Hydrocarbons (first four members in each group),

Hydrocarbons Hydrocarbons are organic compounds, composed entirely of carbon and hydrogen.

Alkanes – They have single Bonds

Alkenes – they have double bond

Alkynes They have triple Bonds

Aromatic Hydrocarbons – Ring compounds

More in lesson two. You teacher will explain more ……

Inorganic compounds;

Inorganic compounds are compounds which do not contain hydrocarbons.

Examples of inorganic compounds

1. Chalk 2. Salt 3. Washing soda 4. Carbon monoxide, CO 5. Carbon dioxide, CO2   6. Trioxocarbonate (IV), CO3 2-


Differences between organic and inorganic compounds

Organic Compounds Inorganic Compounds
They mostly have covalent Bonds They mostly have ionic Bonds
Their reactions are very slow Their reactions are very fast
They have low melting points They have high melting points
They have low boiling points They have high boiling points
They are volatile They are less volatile
They are insoluble in water/ soluble in organic solvent They are soluble in organic solvent/ water


Your teacher will explain into details during face-to-face lessons

Also wait for Lesson two.

WASSCE  Sample Questions Theory

Define Each of the following terms

  1. Polymerization
  2. Saponification
  3. Cracking
  4. Esterification
  5. Detergent
  6. Hydrocarbon
  7. Fats
  8. Functional Group
  9. Plastic

Objective questions  will be in the Next lesson




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