CAIE A Level Chemistry 9701 · The Periodic Table: chemical periodicity
Sodium oxide, , and sulfur dioxide, , are both oxides of elements in Period 3.
Describe what happens when each oxide is added to water, and explain why the pH of the resulting solution differs. Write equations for the reactions that occur.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.