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(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 ...

• Across period 2, the nuclear charge increases from Li (3+) to Ne (10+) as protons are added to the nucleus. - The electros are removed from the same main energy level and electrons in the same main ...

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) ...}

To balance redox equations, do the following steps:
-Divide into 2 half equations
-Balance the formula EXCEPT for oxygen and hydrogen
-Balance the number of oxygens by adding water
...

Acid + Alkali --> Salt + Water Hydrochloric Acid + Sodium Hydroxide --> Sodium Chloride + Water