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Explain why the first ionisation energy of sulphur is lower than that of phosphorus.

The general trend is that the first ionisation energies increases across the period from Na to Ar. But the first ionisation energy of sulphur is lower than phosphorus because the electronic configuration is ...
LR
Answered by Lana R. • Chemistry tutor
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State the H-O-H bond angle of a water molecule and explain why this is the case.

Oxygen has four groups of electrons surrounding it: two sets of lone pairs, and two pairs of electrons that it shares with hydrogens (in these pairs, one electron comes from each of the oxygen and the hydrog...
JP
Answered by Jasmine P. • Chemistry tutor
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What reaction occurs when benzene is mixed with equal amounts of sulphuric and nitric acid?

Intro: This is an electrophilic substitution reaction (nitration)Nitric acid and sulphuric acid are used to create the electrophile (NO 2 + )The electrophile then substitutes itself with a H atom on the benz...
SS
Answered by Simone S. • Chemistry tutor
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What is periodicity?

Periodicity is the trend in chemical and physical properties of the elements across each period of the periodic table.All elements in a period have the same number of shells, all elements in a group have the...
JA
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The equation for the reaction between ammonia and oxygen is shown. 4NH3(g) + 5O2(g) ⇌ 4NO(g) + 6H2O(g) . Calculate the entropy change of the reaction, using data from the table below.

GAS So / J K -1 mol -1 NH3(g) 193 O2(g) 205 NO(g) 211 H2O(g) 189 To calculate the entropy change, use Delta S = sum of products - sum of reactants, in their corresponding stoichometry. Remember to check the ...
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