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Mean Deviation This is the average sum of the deviations from the arithmetic mean (i.e. the sum of the differences between the scores and the mean) divided by the total frequency. Example 1 Find the mean deviation in the following test scores, Score (x) Frequency (f) 95 1 85 1 80 1 75 4 70 […]
Introduction Fats and oils are naturally-occurring esters of three long carboxylic acids called fatty acid with a special type of alcohol called glycerol ( propane- 1,2,3-triol). Glycerol has three carbon atoms, each with an –OH group on. These fats and oils belong to a group of compounds called lipids. Fats are solid at room temperature,
Classwork Series and Exercises {Chemistry- SS3}: Fats and Oils Read More »
Introduction A machine is essentially a device or tool which allows a force (or effect) applied at one point to overcome a resisting force (or load) at another point. Consider a simple machine such as a screw. We apply a small turning force at the head and the screw is able to move through a
Classwork Series and Exercises {Physics- SS2}: Machines Read More »
Substitution Methods The method of solving “by substitution” works by solving one of the equations (you choose which one) for one of the variables (you choose which one), and then plugging this back into the other equation, “substituting” for the chosen variable and solving for the other. Then you back-solve for the first variable. Solve
Classwork Series and Exercises {Mathematics- SS1}: Simultaneous Equations Read More »
Introduction Viscosity simply means friction in fluids. It is observed that it is easier to pour water or kerosene from a container than to pour honey or engine oil. A little stone dropped into a cylinder of water gets to the bottom of the cylinder faster than when the same stone is dropped into a
Classwork Series and Exercises {Physics- SS1}: Viscosity Read More »
Introduction In everyday life, the term work is applied to any form of activity that requires the exertion physical or mental effort, someone may say ‘I go to work’, another may say ‘I work in the office of the director’, so it is used variously with different meaning as it appeals to the user. In
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Introduction Alkanoic acids are also known as carboxylic acids. A carboxylic acid can he identified from the carboxyl functional group and the ‘-oic’ name ending. Structural Examples of carboxylic acids Nomenclature (Naming Alkanoic Acids) Alkanoic acids are named as follows: The number of carbon atoms in the longest carbon atom chain is noted The corresponding
Classwork Series and Exercises {Chemistry- SS3}: Alkanoic Acids Read More »
Standard Index Form Standard index form is also known as standard form. It is very useful when writing very big or very small numbers. In standard form, a number is always written as: a × 10 n a is always between 1 and 10. n tells us how many places to move the decimal point. Example
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Introduction In chemistry, quantitative laws used to express magnitudes of electrolytic effects, first described by the English scientist Michael Faraday in 1833. The quantities of substances produced or consumed by the electrolysis process is dependent upon the following: electric current measured in amperes or amps time measured in seconds the number of electrons required to
Classwork Series and Exercises {Chemistry- SS2}: Faraday’s Laws of Electrolysis Read More »
Resistivity Resistivity: The resistance of a wire or material conductor maintained at a constant temperature is related to its length (l) and its cross-sectional area (A) by the expression R = ρ l/A Where ρ is a constant of proportionality known as the resistivity of the material Then we could deduce ρ = RA/l Thus
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