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Chemistry Revision
Atoms consist of electrons surrounding a nucleus that contains protons and neutrons. Neutrons are neutral, but
protons and electrons are electrically charged: protons have a relative charge of +1 and electrons have a
relative charge of -1.

Atoms and elements

All substances are made of tiny particles called…

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Cu + O2 CuO
CHO, first carbon then hydrogen and then oxygen
Here is the balanced symbol equation:
2Cu + O2 2CuO
Calcium Carbonate

Limestone is mainly calcium carbonate, CaCO3, which when heated breaks down to form calcium oxide and
carbon dioxide. Calcium oxide reacts with water to produce calcium…

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The Earth's crust contains metals and metal compounds , but when found in the Earth these are often mixed with
other substances. To become useful, the metals have to be extracted from whatever they are mixed with. A metal
ore is a rock containing a metal, or a metal compound,…

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Most of the compounds in crude oil are hydrocarbons. These are compounds that contain hydrogen and carbon
atoms only, joined together by chemical bonds called covalent bonds. There are different types of hydrocarbon, but
most of the ones in crude oil are Alkanes.
The Alkanes are a family of…

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Acidic oxides
Carbon dioxide dissolves in water in the atmosphere to form a weakly acidic solution. This means that
rainwater is naturally slightly acidic. However, some of the products from burning fuels make rainwater more acidic
than normal. This is acid rain.
Acid rain reacts with metals and rocks such…


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