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Explain why the second ionisation energy of Magnesium is lower than the second ionisation energy of Sodium.

For the 2nd IE of Na an electron is being removed from the 2p subshell.For the 2nd IE of Mg an electron is being removed from the 3s subshell.It requires more energy to remove an electron from a lower energy...
NR
Answered by NATHAN R. • Chemistry tutor
18830 Views

Why do the boiling points of the hydrogen halides increase as you go down the group from HCl to HI?

That's a fantastic question. Here, we must consider two types of intermolecular forces as these are the attractive forces that affect the boiling point of a substance: van der Waals and permanent dipole perm...
AS
Answered by Amarpal S. • Chemistry tutor
18837 Views

What would be the pH of a reaction between potassium oxide and water?

Potassium oxide is an ionic compound: K 2 O Made up of ions K + and O 2- When added to the water the oxide reacts to form a hydroxide compound.K 2 O + H 2 O = 2KOHKOH is made of K + and OH - ions. The high l...
AM
Answered by Alice M. • Chemistry tutor
10386 Views

Imagine a reaction A for which the values of ΔH and ΔS are both negative. It is known that the absolute value of ΔS is 3 times smaller than the absolute value of ΔH. For what values of T does reaction A occur spontaneously?

We know that a reaction occurs spontaneously when ΔG<0 and that ΔG=ΔH-TΔS. So, we know that the reaction will be spontaneous when ΔH<TΔS.Its is given that ΔH and ΔS are <0 and that |ΔH|=3*|S|. From ...
AC
Answered by Andre C. • Chemistry tutor
2126 Views

Why is the melting point of saturated carbon chains greater than unsaturated carbon chains?

Unsaturated carbon chains contain one or more C-C double bonds. Due to the C-C double bonds, the chain is kinked which means it is not able to pack regularly which results in a lower melting point.
CH
Answered by Charles H. • Chemistry tutor
3415 Views