Edexcel Jun 2016 (IAL) Paper 3 Q (with explained solutions) |

Skip to content

Edexcel Jun 2016 (IAL) Paper 3 Q

Answers available below

Answer ALL the questions. Write your answers in the spaces provided. 1 Some tests are carried out on an inorganic compound A. Compound A is anhydrous and has one cation and one anion. (a) Compound A gives a lilac colour in a flame test. (i) Describe how to carry out a flame test. (3)(ii) Identify, by name or formula, the cation present in A. (1)(b) When a sample of solid A is placed in a test tube and heated, a gas and a vapour are evolved. The gas turns lime water cloudy and the vapour is identified as water. (i) Identify the gas evolved. (1)(ii) Give a test for the presence of water. State the positive result of the test. (2) TestResult(c) (i) Identify, by name or formula, the anion present in A. (1)*P46663A0216*<br />
(ii) Write the equation for the action of heat on A. Include state symbols in your equation. (2) (Total for Question 1 = 10 marks) *P46663A0316* Turn over<br />

Show answer

Question Number 1(a)(i) MP1 and MP2 Acceptable Answer Mark (3) Reject Nickel / chrome / chromium spatula Other acids Just water Just Bunsen Dip (clean) nichrome / platinum wire ALLOW NiCr for nichrome loop / rod for wire OR Silica rod (1) in (concentrated) hydrochloric acid / HCl(aq) ALLOW any mention of HCl(aq) e.g. cleaning or mixing solid and acid or making a paste HCl for HCl(aq) (1) IGNORE Dilute ALLOW (for MP1 and MP2) (Wooden) splint (in place of a wire) and Soaked in distilled / deionised water (2) MP3 then dipped in solid and placed in (hot / roaring / blue-cone) (Bunsen) flame ALLOW salt / compound / substance / paste / solution for solid On / over / under / near / show / above for in (1) IGNORE inoculating / flame-test (wire) Acceptable Answer Question Number 1(a)(ii) K+ OR Potassium (ion) Acceptable Answer Carbon dioxide / CO2 Question Number 1(b)(i) Reject Reject Mark (1) Mark (1)<br />
Question Number 1(b)(ii) MP2 dependent on MP1 Acceptable Answer Cobalt chloride / CoCl2 (paper) (1) Turns (from blue to) pink ALLOW Turns red (1) OR Anhydrous copper(II) sulfate / CuSO4 (1) Turns (from white to) blue (1) ALLOW copper(II) sulfate / CuSO4 (1) Turns from white and to blue (1) Acceptable Answer Question Number 1(c)(i) Question Number 1(c)(ii) Hydrogencarbonate / HCO3 ALLOW Hydrogen carbonate Bicarbonate potassium hydrogencarbonate / KHCO3 Acceptable Answer 2KHCO3(s)K2CO3(s) + H2O(l) + CO2(g) Correct species (1) Balanced & states (1) ALLOW H2O(g) 2KHCO3(s)K2O(s) + H2O(l) + 2CO2(g) scores (1) TE on cation in (a)(ii) If a hydrated Group 2 carbonate or lithium carbonate is used, correct balanced equation scores (1) No TE on a incorrect anion in (c)(i) Total for Question 1 = 10 marks Reject Boiling temperature Mark (2) Mark (1) Mark (2) Reject Carbonate / CO3 2 Reject Anhydrous carbonate (scores (0))<br />

Question

About us | Need Help? | Feedback

Proudly powered by WordPress | Theme: Sydney by aThemes.