This site is maintained by Henry Welman, former provincial co-ordinator (2017-2022) for physical and technical sciences in the Free State, South Africa. Please read the disclaimer at the bottom of the posts.
Monday, 14 November 2016
Comments on the grade 10 chemistry paper (P2)
Do you have any questions/comments related to the grade 10 chemistry paper?
These two questions are on behalf of the group at the DTDC in Welkom: Question 3.7: The question wants an explanation in terms of "spaces" and "forces" for the part of the graph labelled B, which deals with a phase change. The first mark is given for mentioning that Ek remains the same. Can this mark not be allocated somewhere in the rest of the explanation, with the other three marks, where the issue of weakening of forces and increase in spacing are addressed? It feels as if the question should count three marks, but four are available and one of them (the first one) is now given for something that is not really applicable.
Q4.2.1: The underlined part includes "non-metals", but the question did not ask for a comparison between metals and non-metals. It wanted an explanation for the fact that metals form cations readily. Why should a learner then compare metals and non-metals? Can the mark be awarded if a learner states: "Metals have low first ionisation energies."?
Question 4.2.2: Same argument as for 4.2.1. Can the mark be awarded if a learner states: "Non-metals have high first ionisation energies."?
These two questions are on behalf of the group at the DTDC in Welkom:
ReplyDeleteQuestion 3.7: The question wants an explanation in terms of "spaces" and "forces" for the part of the graph labelled B, which deals with a phase change. The first mark is given for mentioning that Ek remains the same. Can this mark not be allocated somewhere in the rest of the explanation, with the other three marks, where the issue of weakening of forces and increase in spacing are addressed? It feels as if the question should count three marks, but four are available and one of them (the first one) is now given for something that is not really applicable.
Q4.2.1: The underlined part includes "non-metals", but the question did not ask for a comparison between metals and non-metals. It wanted an explanation for the fact that metals form cations readily. Why should a learner then compare metals and non-metals? Can the mark be awarded if a learner states: "Metals have low first ionisation energies."?
Question 4.2.2: Same argument as for 4.2.1. Can the mark be awarded if a learner states: "Non-metals have high first ionisation energies."?
There is no remedy for this. Stay on the memo.
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