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The reaction is as follows:

2H₂ + O₂ -> 2H₂O

This means that for every 2 molecules of Hydrogen gas, one...

I would first get the student to find the elements on the Periodic Table, and work out how many valence electrons each atom had. Then I would get them to draw the structures of hydrogen and chlorine us...

58.5

Relative formula mass (M_r) is found by adding together the relative atomic masses (A_r) of all the atoms present in a compound. 

S...

Alkanes are saturated because they contain only single covalent bonds. Alkenes are unsaturated because they do have double covalent bonds.

What you need for these equations are a calculator, periodic table and the following equation:

Mass (g) = Mr x Moles     (important equation to remember)

In t...