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A mole is a unit of 'amount of stuff' and is equal to 6.022x10 23 . It is such a big number because we use the mole to describe how many atoms we have of something, so instead of saying "I have 6.022x10...

Fluorine has 1 more proton than oxygen and one more electron but the same number of shells so no increased shielding. This means there is more electostatic attraction from the nucleus so increased pull from ...

Potassium has 1 electron in its outer shell whilst Sulphur has 6 electrons in its outer shell, this can be deduced from the periodic table as Potassium is in group 1 and Sulphur group 6. When the two react t...

Titrations are used to make soluble salts (remember solubility rules) from an acid and an alkali. There are no solids involved in this reaction and the solutions made are colourless so there is no way of tel...

Bioethanol is a renewable fuel produced from plants, which photosynthesise to grow, taking in carbon dioxide and producing oxygen. This means there is no net increase in carbon dioxide, which is a greenhouse...