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The present perfect tense is really useful and needn't worry you! In English when we say things like 'I have gone' or 'We have arrived', this is the p...
Spanish verbs (words like 'to do' or 'to say' or 'to eat', in English) come in two main groups. Firstly, there are the -ar ending verbs, which make up about 70 per ...
Looking at the reaction between hydrogen and carbon monoxide to form methanol:
CO + 2 H2 ⇌ CH3OH
There are 3 moles on the left hand side and 1 mole on ...
x2 + y2 = 36 (1)
x = 2y + 6 (2)
You can solve simulateous equations in three ways: Substitution, addition or subtraction. If one equatio...
A useful way to answer oxidation/reduction questions is to remeber the acronym OIL RIG:
Oxidation Is Loss (of electrons)
...
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