Sulfuric acid | h2so4 or h2o4s | cid 1118 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more. The comparable equilibrium constant for water, kw is 10−14, a factor of 1010 (10 billion) smaller in spite of the viscosity of the acid, the effective conductivities of the h3so4+ and hso4- ions are high due to an intra-molecular proton-switch mechanism (analogous to the grotthuss mechanism in water), making sulfuric acid a. 0620 chemistry 0620/33 paper 3 (extended theory), maximum raw mark 80 this mark scheme is published as an aid to teachers and candidates, to indicate the cambridge is publishing the mark schemes for the may/june 2013 series for most igcse, gce or sulfuric acid is a stronger acid/more dissociated [1. Mark scheme for the october/november 2013 series 0620 chemistry 0620/33 paper 3 (extended theory), maximum raw mark 80 this mark scheme is (b) (i) zno + h2so4 znso4 + h2o  (ii) zinc reduces / gives electrons / displaces (copper / cobalt / nickel ions)  forming copper / cobalt / nickel (metal which. When concentrated sulphuric acid is added to sodium chloride, hydrogen chloride gas is produced (i) write an equation for this reaction  (ii) calculate the concentration, in mol dm-3, of the solution formed when 196 g of hydrogen chloride are dissolved in water and the volume made up to 250 cm3  (d) the melting. Aqa qualifications a-level chemistry paper 3 (7405/3) mark scheme 7405 specimen paper version 05 page 2 mark scheme – a-level chemistry – specimen paper 3 2 of 10 section a question marking reagent add ethanol and concentrated sulfuric acid and warm result no sweet smell / no oily drops on. Mark scheme – a-level chemistry – chem2 – june 2015 5 of 36 (or converse for bromine) penalise m2 if (covalent) bonds are broken question marking guidance mark comments 2(a) m1 acidified potassium dichromate or k2cr2o7/h2so4 or k2cr2o7/h+ or acidified k2cr2o7 m2 (orange to) green.
This video contains top 10 most highlighted points of marking scheme of icse chemistry 2018 watch till the end to hope students will be benefited through this video for upcoming chemistry exam ma'amin one place o wrote sulphuric acid in place ofconc sulphuric acidwill i get marks there. Mark scheme for the october/november 2015 series 0620 chemistry 0620/33 paper 3 (extended theory), maximum raw mark 80 this mark scheme is published as an aid to teachers and candidates manufacture of sulfuric acid/ contact process manufacture of hydrogen solvent/dissolving coolant/cooling. 9701 chemistry 9701/52 paper 5 (planning, analysis, and evaluation), maximum raw mark 30 this mark scheme is published as an aid to teachers and cambridge is publishing the mark schemes for the may/june 2014 series for most igcse, gce allow sulfuric acid immiscible with trichloromethane layer [1 ] [1.
Coimisiún na scrúduithe stáit state examinations commission leaving certificate 2017 marking scheme chemistry higher level in the case of marking schemes that include model solutions or answers, it should be noted that these are not in dilute sulfuric acid electrolyte / in acidified water electrolyte (2 × 3. Gce chemistry b (salters) unit f335: chemistry by design advanced gce mark scheme for june 2016 oxford cambridge and rsa examinations ocr will not enter into any discussion or correspondence in connection with this mark scheme d iii methanol and conc sulfuric acid/ conc hydrochloric acid ✓ 1.
2011 chemistry higher finalised marking instructions scottish qualifications authority 2011 the information in this publication may be reproduced to support acid catalyst (0) ½ mark for condenser of some type ½ mark for methanol and stearic acid or “reactants” ½ mark for (concentrated) sulphuric acid in test tube. The proton-transfer reaction of sulfuric acid (h2so4) and ammonia (nh3) and the effect of the first two water (h2o) molecules were studied by density functional theory and ab initio molecular orbital theory the equilibrium structures , binding energies, and harmonic frequencies were calculated for each of.
2ai) tickbox: 159g of copper oxide reacts with 196 grams of sulphuric acid, whats the mass of the products  bottom box: 319 and 36 the following question is retardid 2aii) this got me they changed the fing equation: copper carbonate reacts with sulphuric acid (apparatus shown), describe. Gce chemistry (6ch05/01) all the marks on the mark scheme are designed to be awarded examiners should acids' concentrated hno3 and concentrated h2so4 extra reagents 1 question number acceptable answers reject mark 24(a)(ii) to prevent multiple substitutions/ to stop di- or. Potassium cyanide / kcn (1) with hydrochloric acid / sulfuric acid (to generate hcn) (1) ignore concentration of acids mark for hcl etc is consequential on kcn or hydrogen cyanide / hcn (1) with sodium hydroxide / other base (to make cyanide ions) (1) mark for naoh etc is consequential on hcn.
These marking instructions have been prepared by examination teams for use by sqa part one: general marking principles for chemistry higher addition of numbers no units required (deduct ½ mark for incorrect units) 9 a i concentrated sulphuric acid/ch2so4 1 sulphuric acid 9 a ii reaction mixture and/or ester.
These marking instructions have been prepared by examination teams for use by sqa appointed markers when marking external mark scheme worth ½ worth 0 10 (a) for drying, entry delivery tubes must be below surface of concentrated sulphuric acid and exit tube must be above (1) for collection, apparatus must. Mark scheme for the may/june 2015 series 0620 chemistry 0620/21 paper 2 (core theory), maximum raw mark 80 this mark scheme is published as an aid to 4(c)(ii) covalent 1 i single bond 4(d) sulfuric acid magnesium oxide/magnesium hydroxide/magnesium carbonate 2 a correct formulae r magnesium. International gcse chemistry 4ch0 2c – january 2012 question number expected answer accept reject marks 1 (a) proton neutron electron do not penalise careless use of solution or liquid for reaction mixture correct formula pb2+ + so4 2 ⎯ → pbso4 for 2 marks concentrated sulfuric acid 1 1 1 1. Higher chemistry general information for markers the general comments given below should be considered during all marking 1 marks should not be deducted for page 13 mark scheme worth ½ worth 0 8 (a) ethanoic (acetic) acid 1 (b ) (i) concentrated sulphuric acid (accept h2 so4 with correct state symbol) 1.