Aqa a level exampro - Study guides, Revision notes & Summaries

1 AqA EXAMPRO A-LEVEL CHEMISTRY Practice Paper 1 MARK SCHEME Maximum marks: 105 View detailed guidance on the conclusions you can draw from your students' performance in these papers on the MERiT welcome page. Understand how your students compare with others and target revision effectively by entering marks into MERiT. (a) (i) [H+][OH-J OR (H3O+][OH-J Ignore (aq) Must have [ J not () (ii) 3.46 X 10-14 (= 1.86 X 10-7) If no square root, CE= 0 pH= 6.73 Must be 2dp (iii) [H+] = 10...

We have too many Physics resources to list here so visit include: • additional practice papers to help students prepare for exams • guidance on how to plan both the AS and A-level courses with supporting schemes of work for co-teaching • several AQA-approved student textbooks reviewed by experienced senior examiners • guidance on maths skills requirements with additional support via Exampro • resources to support key topics (including the optional topics), with detailed lesson ...

A-LEVEL CHEMISTRY PRACTICE P 3 1 A 5.00 g sample of potassium chloride was added to 50.0 g of water initially at 20.0 °C. The mixture was stirred and as the potassium chloride dissolved, the temperature of the solution decreased. (a)Describe the steps you would take to determine an accurate minimum temperature that is not influenced by heat from the surroundings. (b)The temperature of the water decreased to 14.6 °C. Calculate a value, in kJ mol−1, for the enthalpy of solution of potassi...

1 In this question, give all values of pH to 2 decimal places. (a)The ionic product of water has the symbol Kw (i)Write an expression for the ionic product of water. __________________________________________________________ (1) (ii)At 42°C, the value of Kw is 3.46 × 10−14 mol2 dm−6. Calculate the pH of pure water at this temperature (to 2 decimal places). __________________________________________________________ (iii)At 75 °C, a 0.0470 mol dm–3 solution of sodium hydroxide h...

1 The following table gives the names and structures of some structural isomers with the molecular formula C5H10 (a)Isomer 1 exists as E and Z stereoisomers. (i)State the meaning of the term stereoisomers (ii)Draw the structure of the E stereoisomer of Isomer 1.