Lesson Notes, Audio Lessons, Exam Questions
Lesson Notes, Audio Lessons, Exam Questions
See our detailed chemistry lesson notes for SS 1, SS 2, and SS 3 students, designed to align with the WAEC and NECO syllabus. These lessons cover all major chemistry topics, helping students grasp key concepts and prepare effectively for their exams.
Whether you’re revising, learning new topics, or need quick explanations, these notes serve as a valuable resource for mastering chemistry.
Access free SS 1 to SS 3 chemistry lesson notes aligned with WAEC & NECO syllabus. Learn important chemistry concepts and prepare for exams.
The passage of electricity through the electrolytes in their molten or dissolved state can cause chemical changes under suitable conditions. For example, the passage of electricity through the acidified water results in the formation of hydrogen and oxygen gases. The…
When an electric current is passed through an electrolyte solution, the ions of the electrolyte undergo chemical changes at the respective electrodes. The chemical reaction carried out by passing electricity is called electrolysis. it is important that we familiarize ourselves…
To account for the phenomena of electrolysis the Ionic Theory was put forward by Arrhenius in 1880. The theory states that electrolytes are made up of ions, which are built up in certain patterns called crystal lattice. When these substances…
Balancing by Ion Electron or Half-Reaction Method We are familiar with the balancing of chemical equations by inspection method. However, inspection method may not be useful for balancing the redox equations because in these equations, we have to keep in…
In our daily life we come across processes like rusting of iron articles, fading of the colour of the clothes, burning of the combustible substances such as cooking gas, wood, coal, etc. All these processes fall in the category of…
Most of the properties of the elements such as atomic volume, atomic size, ionization enthalpy, electron affinity and electronegativity are directly related to the electronic configuration of the atoms. These properties undergo periodic variation with the change in the atomic…
The Need For Classification of Elements Before the beginning of eighteenth century, only a very few elements were known and it was quite easy to study and remember their individual properties. In 1800, only 31 elements were known. This number…
It has a functional group of NH2. MOLECULAR FORMULAR/STRUCTURE It has a general molecular formula of RNH2 or structure of R – N – H H PREPARATION: They are derivatives of ammonia where one or more hydrogen atoms have been…
Carbohydrates are naturally occurring organic compounds containing carbon, hydrogen and oxygenwith oxygen in the ratio 1:2 as in water. The general molelcular formula of carbohydrates is Cx(H2O)y or CxH2yOy. Carbohydrates are generally polydroxyl aldehydes, ketones or any compound that on…
Polymerisation (addition and condensation) of plastics. Thermosplastic and thermosetting polymers, resins. A polymer is the final product, a macromolecule of high molecular mass. It consists of repeating units, and its general molecular formula may be represented as [repeating units]n where…
Sources, Properties and Uses: Detergents and Soaps Structure, their mode and action. Fats and oils belong to a general group of compounds known as lipids. SOURCES Fats are solids that usually come from animals e.g. Tallow (mutton fat). Oils are…
ALKANOATES General molecular formula, nomenclature, preparation, properties and uses. SOURCES The alkanoic acid or carboxylic acids are also called fatty acids because some of them are found in natural fats and oils. They contain the functional group called carboxy group.…
SOURCES OF ALKANOLS General molecular formular Alkanol is a homologous series with general molecular formular of Cn H2n+1OH or ROH. Or (CnH2n+2O). Nomenclature The names of alkanols are obtained by substituting “e” in alkanes with “Ol” in alkanol e.g. methanol…
Benzene: Benzene is a typical aromatic compound with molecular formula of C6H6. It has the structure of: Preparation C6H14 V2O2C6H6 + 4H2 The process is known as catalysticreforming . 3 ( H – C = C – H ) C6H6…
Alkynes are the homologous series of unsaturated hydrocarbon with a general molecular formua CnH2n-2. Alkynes show a high degree of unsaturation than alkenes, hence,t hey are chemically more reactive than the corresponding alkenes or alkanes. Examples are : H H…
Unsaturated Hydrocarbons These are hydrocarbons in which carbon atoms join with each other by multiple bonds. The multiple bond can be a double bond, e.g Alkene or a triple bond, e.g Alkyne. H – C = C – H H…
Saturated hydrocarbons are hydrocarbons consisting of carbon chains with single bonds between them, in which carbon joins with another carbon by a single covalent bond, e.g Alkanes ( like ethane C2H6, propane C3H8 ) H H HHH H – C …
Definition of Simple Machine A machine is a tool or device that makes work easier. It is defined as a tool which uses force applied (effort) at one point to overcome another resisting force (effort) at another point. Examples of…
Percentage of Oxygen in Air We have read that Air consists mainly of molecules of oxygen and nitrogen with important yet trace amounts of other gases. We know that the combustion of organic material requires oxygen. The idea here is…
Alkali is pronounced like alcohol, with ‘lie’ at the end instead of ‘hol’. An alkali is any substance which produces OH– ions in water. OH– ions are called hydroxide ions. If there are excess of (OH)– ions when a compound is…