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Start by identifying the atoms that are going to be bonded to each other, for example, two hydrogen atoms, and then work out how many electrons are in the outer shell of those atoms. Hydrogen only has one...

(Talk about needing to memorise colour tests for base metals and tests for Halides) The compound is KI (potassium Iodide) because potassium compounds burn with a lilac flame, and production a pale yellow ...

First of all, it is important to note that changing the pressure will only affect the gas molecules in the reaction. Taking a simple equilibrium equation such as:

2SO_{2 (g)} + O_{2 (g) ...}