By Margaret Cross
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Additional info for AQA AS Chemistry Student Unit Guide : Unit 1 Foundation Chemistry
The part questions are worth more marks than those in Section A. All the questions in this Questions and Answers section are structured, without answer spaces. You should use the number of marks as a guide to the length of the answer required. If a question is worth 4 marks, then you should expect to write no more than four sentences, making four separate points. The marking scheme identifies four key words or phrases that must be present for you to score the 4 marks. The total marks per question vary, up to 30 marks.
E. 1:1 or 1:2. ● mass concentration × V Use n = if a solid is involved or n = if a solution is involved. 9% ✓ Actual masses do not have to be given in questions about percentage atom economy; the required masses are obtained from the formulae given. Be sure to use the correct number of moles of reactants — in this case, 1 mol CO2 and 2 mol NH3.
A grade-C candidate is likely to score only the ﬁrst 3 marks. 8 tonnes ✓ This reacting masses question is relatively easy compared with some of the other calculations in this section. Marks are awarded for calculating the Mr of the compounds, realising that it is a 1:2 ratio in the equation and scaling down to produce the correct answer, which must include the correct units. 61 Q4 AS Chemistry uestion Amount of substance (II) (a) (i) Deﬁne the term ‘relative molecular mass’. 023 ؋ 1023. What is the name given to this number of molecules?