The Zimsec O level Exam Timetable December 2020 is out and exams are starting in early December up until February. You can download the Grade 7, O level and A level timetables below. Download as pdf Grade 7 Exam Timetable O’level Exam Timetable
Some Important Chemical Reactions you should know (O level chemistry) Ionisation of elements Ionisation of Group 1 elements (alkaline metals) Atoms of Group 1 elements have 1 electron in the outer shell, so they ionise by losing 1 electron to form a positively charged ion of charge +1. This is oxidation because it involves loss …
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Electron Shells, Subshells and how they are filled (A level Chemistry) Many chemistry students face problems on electron shells, subshells and how they are filled. However, the issue of filling shells and sub-shells is very straight forward except for some minor exceptions that we are going to highlight of course. For some students, the problem …
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What are valence electrons (A level Chemistry) What are valence electrons? Welcome, and in this post we are going to be discussing about: what valency electrons are. how valency electrons determined the chemical properties of an atom. the relationship between the number of valence electrons of an element and its position on the periodic table. …
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How to use the periodic table In this post we are going to discuss on how to use the Periodic Table. To a random person, the Periodic Table might look like just an orderly arrangement of atoms but to a chemist, the Periodic Table is the summary of chemistry. The Period Table shows us: names …
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Water and its properties Water and its properties make it one of the most important compound on earth. More than 75% of the earth’s surface is covered with sea, rivers and lakes and this makes water the most common compound on earth. Water is also found in abundance in bodies of all living organisms. For …
How to solve quadratics by completing the square Completing the square is one of the most versatile technique in quadratic equations and expressions. By completing the square we can solve a quadratic function to find the: roots of the quadratic function turning points (maximum or minimum point) of the quadratic function Before we start solving …
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Preparation of Salts (O level Chemistry) Preparation of salts depends on the physical and chemical properties of the salt. For example, when choosing the best method to prepare a salt you need to consider the following: is the salt soluble? If yes, we usually prepare it by neutralisation of acid and carbonate or acid and …
Organic Chemistry Questions and Answers (O level Chemistry) Organic chemistry deals with the compounds of carbon, except for carbonates and carbon dioxide. The following is a list of organic chemistry questions and expected answers for O level chemistry students. The first question is about ethanol (from the alcohols functional group) and ethene (from the alkenes …
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What is a salt? A salt is a substance formed when the hydrogen of an acid is replaced by a metal. Three common ways of making a salt: When an acid neutralise a base or an alkalis. For example, sulphuric acid neutralises sodium hydroxide (an alkali) to produce sodium sulphate (a salt) and water. H2SO4(aq) …