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A covalent bond is formed due to a shared pair of electrons between to atoms. It occurs between two non-metal atoms eg) HClAn ionic bond is formed when there is a strong electrostatic attraction between o...

A reaction in which a substance is broken down into 2 or more substances by heat. An example is the breakdown of calcium carbonate into carbon dioxide and calcium oxide.

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Crude oil is seperated using a method called fractional distillation. The hydrocarbons that make up crude oil have different boiling points, so when the crude oil is heated, each compound evaporates at...

Avogadro's number is simply used as a way of telling us how much of a substance we have. 

The number is 6.022 x 10²³, and if we have that number of particles, we can make it ea...

An atom of hydrogen contains 1 proton, 1 electron and 0 neutrons. When hydrogen loses an electron to become H+ only a proton remains. 

We can work out the number of neutrons an atom has by...