IB Chemistry HL - Periodicity

Which is correct about Na2O?

• It's a simple strongly acidic oxide

• The oxide ion, O2-, is a very weak base so it has a low tendency to combine with H ions

• It's a simple strongly basic oxide

• The reaction of Na2O with H2O gives a pH of 7

Na2O(s) + H2O(l) --> ?

Tags

NGSS.HS-PS1-7

Which is correct for MgO?

• The reaction of MgO with HCl gives a pH of around 10.3

• It requires less energy to break

• It's more strongly basic than Na2O since oxide ions are more weakly-bound

• The reaction of MgO with water gives a pH of around 10.3

Tags

NGSS.HS-PS1-1

MgO(s) + H2O(l) --> ?

Tags

NGSS.HS-PS1-7

Which is correct for P4O10

• It is classified as a basic oxide

• It has a pH of 0-1

• It reacts violently with water to give a very weak acid of H2PO4 (phosphoric acid)

• It has a pH of 13-14

Construct the balanced equation:

NO2 reacts with water to form nitrous acid(HNO2) and nitric acid(HNO3)

Construct the balanced equation:

NO2 reacts with water but the nitrous acid(HNO2) decomposes to nitric oxide(NO) with nitric acid(HNO3)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Construct the balanced equation:

N2O3 reacts with water to give nitrous acid(HNO2)

SO2(aq) + H2O(l) --> ?

SO3(aq) + H2O(l) --> ?