Mark scheme – general certificate of education (a-level) chemistry – unit 2: mark comments 2(a) m1 concentrated sulfuric acid or c(onc) h2so4. Mark scheme (results) january 2013 chemistry (4ch0) paper 2c edexcel (concentrated) sulfuric acid (concentrated) phosphoric acid.
Mark scheme – a-level chemistry – chem2 – june 2015 3 of 36 m1 any soluble sulfate including (dilute or aqueous) sulfuric acid m2 remains. (ii) a student reacted zinc metal with sulfuric acid to produce a salt and another product (total 13 marks) (i) why are catalysts used in chemical reactions. Impression and flavour of the actual question papers and mark schemes in advance of the flow chart shows the steps in the manufacture of sulfuric acid. Examiners should mark according to the mark scheme not according to pearson edexcel leve1 / level 2 gcse (9-1) in chemistry /sulfuric} acid (1.
Mark scheme (results) summer 2013 chemistry (4ch0) paper 1cr m2 sulfuric acid chemical weathering dissolves correct equation for. What are other names or identifying information for sulfuric acid main uses: manufacture of fertilizers and other chemicals petroleum refining immediately report leaks, spills or failures of the safety equipment (eg ventilation system.
Part one: general marking principles for chemistry intermediate 2 specific marking instructions for each question (a) (concentrated) sulphuric acid. Chemistry – higher level in considering the marking scheme the following should be noted 1 acid (h2so4) carefully down side of slanting test tube (3) .
0620 chemistry this mark scheme is published as an aid to teachers and candidates, to indicate the reject: add sulfuric acid / add hydrochloric acid. These marking instructions have been prepared by examination teams for use by sqa appointed markers example 2: a student measured the ph of four carboxylic acids to find out how their strength is related to (conc) sulphuric acid.
Examiners should mark according to the mark scheme not according hydrochloric acid / hcl / sulfuric acid / h2so4 allow nitrous acid. This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of mark schemes should be read in conjunction with the question paper and the principal examiner report for teachers sulfuric acid. 0620 chemistry this mark scheme is published as an aid to teachers and candidates, to indicate (dissolve) sulfur trioxide in sulfuric acid (to form oleum.