Explain why first ionisation energy decreases down a group.
As you go down the group, ionisation energy decreases because there are more electron shells and shielding increases, therefore the outer electron is further away from the positive nucleus and is less strongly attracted to it.
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All answers ▸At 25 °C, the initial rate of reaction is 3.1 × 10−3 mol dm−3 s−1 when the initial concentration of C is 0.48 mol dm−3 and the initial concentration of D is 0.23 mol dm−3 . Calculate a value for the rate constant at this T when rate = k [C][D].
How can I use an infrared spectrum with a mass spectrum to identify an unknown compound?
Analysing IR spectrum.
What is meant by the term amphoteric? and give an example of a reaction using NaOH that could be used to distinguish between a solution of amphoteric AlCl3 and non-amphoteric MgCl2.