CAIE A Level Chemistry 9701 · Chemical bonding
The hydroxonium ion, , forms when a hydrogen ion, , bonds to a water molecule, . Compare the bond formed between the oxygen atom and the added with the two O-H covalent bonds already present in the water molecule. Refer to how each type of bond is formed and to how the two types of bond would be represented in a dot-and-cross diagram.
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.