CAIE A Level Chemistry 9701 · Group 2
Barium oxide, , reacts with water to form an alkaline solution. Barium metal also reacts with water.
Compare the reaction of barium oxide with water with the reaction of barium metal with water. In your answer, include a balanced equation for each reaction and state what is observed in each case.
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.
Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.