Examiners’ Report June 2018 GCSE Chemistry 1CH0 1H

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Pearson aspires to be the world’s leading learning company. Our aim is to help everyone progress in their lives through education. We believe in every kind of learning, for all kinds of people, wh... erever they are in the world. We’ve been involved in education for over 150 years, and by working across 70 countries, in 100 languages, we have built an international reputation for our commitment to high standards and raising achievement through innovation in education. Find out more about how we can help you and your students at: www.pearson.com/uk. June 2018 Publications Code 1CH0_1H_1806_ER All the material in this publication is copyright © Pearson Education Ltd 2018 2 GCSE Chemistry 1CH0 1HIntroduction This examination paper was the first of this series for the 1CH0 1H, Chemistry Higher tier GCSE.This paper, like all the separate science examinations, contains ten questions giving a total of 100 marks. Six of the questions on this paper also appear on the 1SC0 1CH, Combined Science (Chemistry) Higher tier paper. This paper contains items worth 27 marks that also appear on the Foundation paper. These overlap items are the whole of question 2, question 3 parts (a) – (c) and the whole of question 4.Four of the questions assessed the chemistry topic 5 but did call on a couple of statements from earlier topics. The paper was targeted at grades 9 to 4, with about half the marks for grades 6 to 4. The paper made use of a variety of question types suitable for candidates at this level; multiple choice, calculations and short answer questions being the frequent types. The paper contained only two extended open response questions (6-mark), but 4-mark questions will feature more prominently in future papers. As with the other Chemistry papers, a minimum of 20% of the marks were for maths, a minimum of 15% for testing practical skills and a maximum of 15% on knowledge in isolation (recall) questions. GCSE Chemistry 1CH0 1H 3Question 1 (b) Many candidates performed well in this question and understood that the oil acted as barrier or protected the steel. But many only mentioned one factor needed for rusting, either oxygen or water, and so lost out on the second mark. The main misconception was where students mentioned oil minimising friction and then made the link to this causing a decrease in the corrosion with some students thinking lubrication was a sacrificial method of protection. A good answer. The oil acting as a barrier for the first marking point is seen from 'It prevents ..... from coming into contact with ...'. Also, '... oxygen or water ...' showing that both of these are needed for corrosion scored the second marking point. Focus your answer on the question being asked. 4 GCSE Chemistry 1CH0 1HThe first line of this does not answer the question. Lubricating the chain will reduce friction, but the question is about how lubricating the chain reduces corrosion. This idea of reducing friction was commonly seen and received no credit. There was no mention of air or water in the answer and their involvement in corrosion. So this answer scored 0 marks. [Show More]

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