Chemistry gcse coursework help

Following the same technique as before we know that there is 1 Calcium atom in this formula, but the Oxygen and Hydrogen are inside a bracket with a subscript 2 after it.

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There are 1 Sodium atom, 3 Magnesium atoms, 6 Aluminium atoms, 6 Silicon atoms and 18 Oxygen atoms before the brackets.This means that it is made from Hydrogen and Oxygen, both of these are gases at room temperature but when they are joined together in a compound they are liquid at room temperature.The main thing you need to remember about Ionic is that the electrons are thrown across or given.What you need to know for GCSE Science and Additional Science for GCSE Chemistry and GCSE Physics.

A full electron outer shell is what atoms want because it is when they are most stable, the noble gases or group 8 have full outer shells and they are very very very unreactive meaning they are highly stable.The bonding that takes place is all to do with the outer shell electrons, bonding only uses the outer shell electrons.

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In the second bracket there is an Oxygen and Hydrogen atom with a subscript of 4 outside meaning there are 4 Oxygen atoms and 4 Hydrogen atoms.

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The important things to remember about C hemical formulas are that the identification of the elements are as C hemical symbols (for greater detail see this post ).CO 2 is the chemical formula for Carbon Dioxde, it contains 1 Carbon atom and 2 Oxygen atoms.

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You have to keep adding more to either side to make it balanced.

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