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An aldehyde will react with Tollen's reagent to form a characteristic silver mirror, whereas a ketone will not react. This is because an aldehyde can be oxidised to a carboxylic acid, reducing Tollen's reage...

Completing the square means to put our equation into a slightly different form which looks like this, where a and b are real numbers: (x+a) 2 + b = 0 From here, we can rearrange the equation and directly sol...

This is a very important skill - for GCSE, above and below! The first stage is to read the poem at least twice, first just going over it, and the second time underlining or highlighting things that you find ...

The simple past is formed with an auxiliary verb plus the past participle. The two auxiliary verbs are essere and avere . When to use avere Avere is the most common auxiliary verb. It is used with transative...

Mitosis consists of four basic phases. 1. Prophase 2. Metaphase 3. Anaphase 4. Telophase It is a common mistake to believe that interphase is part of mitosis. In fact, interphase is just a preparation stage ...