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Periodicity QP

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Total cards: 7•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (7)

#1
Front (Question)

Give an equation for phosphorus oxide with water. Suggest a pH. [2]

Back (Answer)

[1] P4O10 + 6H2O → 4H3PO [2] 1

#2
Front (Question)

Explain, in terms of crystal structure and bonding, why silicon oxide has a higher melting point then phosphorus oxide [4]

Back (Answer)

[1] SiO2 is macromolecular [2] Strong covalent bonds [3] P4O10 is molecular or simple covalent molecule [4] Weak van der Waals forces between molecules

#3
Front (Question)

Give one element which deviates from the general trend of ionisation energy and why? [3]

Back (Answer)

[1] Aluminium [2] (Outer) electron in (3)p orbital / sub-shell [3] (3p) higher in energy / slightly more shielded (than 3s)

#4
Front (Question)

Meaning of periodicity [1]

Back (Answer)

[1] Repeating pattern/trends (of physical or chemical properties/reactions)

#5
Front (Question)

Rank the size of S, P, Cl and Ar

Back (Answer)

S8 > P4 > Cl2 > Ar

#6
Front (Question)

Why does Na2O form an alkaline solution when reacting with water [2]

Back (Answer)

[1] Sodium oxide contains O2– ions [2] These O2– ions react with water forming OH– ions

#7
Front (Question)

Ionic equation when P4O10 react with an excess NaOH [1]

Back (Answer)

[1] P4O10 + 12OH– -> 4PO43- + 6H2O