Nitrogen, which makes up about 78% of our atmosphere, is a colorless, odorless, tasteless and chemically unreactive gas at room […]
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Category: Chemistry
Free Chemistry online learning lesson notes and videos for Secondary school and High school students. The lesson notes, videos and interactive slideshows are built on curriculum that is designed to meet national and international O’ Level standard for Senior High School or Senior Secondary school students (SS1, SS2, SS3 or SHS1, SH2, SH3) and Grade 9, Grade 10, Grade 11 and Grade 12 students.
Free online lesson notes and videos for the following exam preparations: WAEC, JAMB, Cambridge O’Level, NECO, GCE, British IGSCE, KCSCE, United States and Canada High School Exam preparations, etc.
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The Halogens
There are six elements in Group VIIA, the next-to-last column of the periodic table. As expected, these elements have certain […]
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Oxygen and it’s compound
Oxygen is the most abundant element on earth. It is found almost in everything in nature and also in free […]
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History of hydrogen
Hydrogen comes from Greek meaning “water producer” (“hydro” =water and “gennao”=to make). First isolated and identified as an element by Cavendish […]
Reversible reactions A reversible reaction is one which can be made to go in either direction depending on the conditions. […]
https://www.youtube.com/embed/eJXL0IrbtqEEnergy is conserved in chemical reactions. One way of stating the ‘law of Conservation of Energy’ is to say the […]
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Rate of chemical reaction
Chemical reaction rate refers to one or more of the following: The rate of disappearance of one of the reactants. The […]
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Mole concept
Since it is not possible to calculate the weight of particles individually, a collection of such particles called mole is […]
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Molar Volume
Molar volume is the volume occupied by one mole of any gas at a definite pressure and temperature. It is […]
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