2026 H2 Timed Practice Paper 2 QP (to upload)

NJC SH2 Timed Practice 9476/2/26 [Turn over NATIONAL JUNIOR COLLEGE SH2 MID YEAR TIMED PRACTICE Higher 2 CANDIDATE NAME SUBJECT CLASS REGISTRATION NUMBER CHEMISTRY Paper 2 Structured Questions Candidates answer on Question Paper. Additional Materials: Data Booklet 9476/02 7 July 2026 2 hours READ THE INSTRUCTIONS FIRST Write your subject class, registration number and name on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions in the spaces provided on the Question Paper. The use of an approved scientific calculator is expected, where appropriate. A Data Booklet is provided. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use 1 /7 2 /19 3 /15 4 /18 5 /12 6 /9 Paper 2 Total /80 This document consists of 24 printed pages including 1 blank page.

2 NJC SH2 Timed Practice 9476/2/26 1 (a) Two organic compounds, A and B, can co -polymerise to produce a polyester. On treatment with hot acidified sodium dichromate( VI), compound A, C4H10O2, is converted into compound B. Compound B can also be formed from fumaric acid, HO2CCH=CHCO2H, upon treatment with hydrogen over a nickel catalyst (i) Draw the structures for compounds A and B. A B [2] (ii) Draw the structural formula of one repeat unit of the polymer formed from compounds A and B. [1] Poly(A-B) is a biodegradable plastic and can be used for food packaging like disposable tablewares and paper cups. (iii) Suggest why poly(A-B) is biodegradable. …………………………………………………………………………………….…. ……………………………………………………………………….………………. ……………………………………………………………………………………….. [1]

3 NJC SH2 Timed Practice 9476//2/26 [Turn over (b) Ethane-1,2-diol, HOCH2CH2OH, has a wide variety of uses including in antifreeze in cars. Ethane-1,2-diol undergo a series of steps to form NH2CH2CH2NH2. HOCH2CH2OH Step 1 Y ethanolic NH3 heat in sealed tube H2NCH2CH2NH2 (i) Suggest the structure of Y and state the reagents and conditions for step 1. Y: ………………………………………………………………………………. Step 1: ………………………………………………………………………………. [2] (ii) Deduce which compound, HOCH 2CH2OH or NH 2CH2CH2NH2 has a higher boiling point. …………………………………………………………………………………….…. …………………………………………………………………………………….…. ………….………………………………………………………………………... [1] [Total: 7]

4 NJC SH2 Timed Practice 9476/2/26 2 Bromine can form several compounds under suitable conditions as shown in Table 2.1. Table 2.1 Bromine containing species Oxidation number of Br Br − −1 BrO− +1 BrF4− +3 BrO3−