By Margaret Cross
Pupil Unit publications are ideal for revision. every one advisor is written by way of an examiner and explains the unit specifications, summarises the suitable unit content material and contains a sequence of specimen questions and solutions.
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Extra resources for AQA AS Chemistry Student Unit Guide : Unit 1 Foundation Chemistry
25 ϭ forty four. three ✓ partly (i), it really is necessary to express the 3 phases focused on deriving the ﬁnal expression. partly (ii) you're steered to teach your operating, simply if you happen to make a clumsy slip. you want to constantly convert kPa to Pa and dm3 to m3. A grade-C candidate is probably going to lose the mark for the latter conversion. (d) moles of Na2CO3 = = mass Mr four. 00 106. zero moles of CO2 = zero. 0377 ✓ V= 60 nRT p ✓ = zero. 0377 ✓ = zero. 0377 × eight. 31 × 303 a hundred × 103 ✓ = nine. forty nine × 10Ϫ4 m3 ✓ (or zero. 949 dm3 or 949 cm3) There are 4 phases during this calculation. The ﬁrst mark is for the Mr and the second one is for the variety of moles of Na2CO3. to accomplish the 3rd mark, you want to appreciate that the ratio of Na2CO3 : CO2 is 1:1, as proven within the equation. The fourth mark is for utilizing the rearranged excellent fuel equation. universal blunders comprise now not changing °C to okay (by including 273) and never changing kPa to Pa. The ﬁnal solution will purely achieve a mark whether it is given to the proper variety of signiﬁcant ﬁgures and contains the devices. A grade-C candidate is probably going to attain merely the ﬁrst three marks. (e) Fe2O3 → 2Fe 159. 6 g ✓ → 2(55. eight) = 111. 6 g ✓ questions & solutions AQA Unit 1 seventy nine. eight g → fifty five. eight g seventy nine. eight tonnes → fifty five. eight tonnes ✓ This reacting plenty query is comparatively effortless in comparison with a few of the different calculations during this part. Marks are offered for calculating the Mr of the compounds, realising that it's a 1:2 ratio within the equation and thinning out to provide the proper solution, which needs to contain the right kind devices. sixty one Q4 AS Chemistry uestion quantity of substance (II) (a) (i) Deﬁne the time period ‘relative molecular mass’. (ii) The variety of molecules in 1 mole of carbon dioxide is 6. 023 ؋ 1023. what's the identify given to this variety of molecules? (b) Magnesium reacts with dilute hydrochloric acid to provide magnesium chloride and hydrogen: Mg(s) + 2HCl(aq) → MgCl2(aq) ؉ H2(g) Calculate the amount of zero. 500 mol dm؊3 hydrochloric acid had to react thoroughly with 1. 50 g of magnesium ribbon. (c) Magnesium carbonate decomposes to supply magnesium oxide and carbon dioxide: MgCO3(s) → MgO(s) ؉ CO2(g) (i) Calculate the utmost mass of magnesium oxide that may be shaped while 10. zero g of magnesium carbonate is decomposed thoroughly. (ii) In an test concerning the decomposition of magnesium carbonate, in simple terms four. 05 g of magnesium oxide used to be got. Calculate the share yield. (d) you're supplied with separate strategies of zero. a hundred mol dm؊3 sulfuric acid. (i) Calculate the mass of zinc had to thoroughly react with 50. zero cm3 of a zero. a hundred M answer of sulfuric acid. Zn(s) ؉ H2SO4(aq) → ZnSO4(aq) ؉ H2O(l) (ii) Calculate the amount of zero. 2 hundred mol dm؊3 sodium hydroxide answer had to react thoroughly with 50. zero cm3 of zero. a hundred mol dm؊3 resolution of sulfuric acid. 2NaOH(aq) ؉ H2SO4(aq) → Na2SO4(aq) ؉ H2O(l) (e) Carbamide, NH2CONH2, is used as a fertiliser, in animal feeds, in paper processing and in more than a few production methods. Its manufacture should be represented via the final equation: CO2 + 2NH3 → NH2CONH2 + H2O Calculate the proportion atom economic climate for the construction of carbamide.