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whenever you move a term across the equals sign, the sign changes. So first we are going to move all of the x terms onto the left side and all of the number terms onto the right side, remembering that if ...

As this question is worth 6 marks, 6 different points need to be made to get all the marks. These could be two from each structure that is given. The teeth in the mouth break down food into smaller pieces...

The unseen commentary can be very daunting - some students think you can't revise for it (because it's unseen, right?), but I think you can, and the key to doing well is: (1) to consider the key elements ...

Firstly, ensure that you have all of the notes from class (or from tutoring sessions) from throughout the year. If you do not have all of the topics that are covered in the exam in your book, then you nee...

NaOH + HCl --> NaCl + H2O

This is a typical acid-base reaction. The general formula for these reactions are Acid + Base --> Salt + Water. The metal in the base and the non-metal in the acid r...