ACSI 2018 Prelim Paper 3

Anglo-Chinese School (Independent) Year 6 Preliminary Examination 2018 INTERNATIONAL BACCALAUREATE DIPLOMA PROGRAMME CHEMISTRY HIGHER LEVEL PAPER 3 Thursday 13th September 2018 1 hour 15 minutes INSTRUCTIONS TO CANDIDATES • Do not open this examination paper until instructed to do so. • Write your candidate session number in the box above. • A calculator is required for this paper. • A copy of the Chemistry Data Booklet is required for this paper. • Answer all questions from Section A and Section B in the boxes provided. • If you use additional sheets of paper for your answer, attach them to the booklet. Indicate the question number clearly on these sheets. • The maximum mark for this examination paper is [45 marks]. This question paper consists of 12 printed pages including this cover page. 0 0 2 3 2 9 For examiner’s use Section A Qn 1 / 10 Qn 2 / 5 Section B Qn 3 / 7 Qn 4 /5 Qn 5 / 8 Qn 6 /8 Qn 7 /2 Total /45 Candidate Session Number

2 Section A Answer all questions. Write your answers in the boxes provided. 1. The overall PSI (Pollutant Standard Index) is an air quality indicator that is based on five pollutants namely particulate matter (PM10), sulfur dioxide, carbon monoxide, ozone and nitrogen dioxide. To calculate the overall PSI for an area, the PSI pollutant value of each pollutant is firstly calculated using the formula and table of P and C values given below. n P C PM10 (g m−3) SO2 (g m−3) CO (mg m−3) Ozone (g m−3) NO2 (g m−3) 1 50 50 80 5 118 - 2 100 150 365 10 157 - 3 200 350 800 17 235 1130 4 300 420 1600 34 785 2260 5 400 500 2100 46 980 3000 6 500 600 2620 58 1180 3750 PSI pollutant value = [ P(n+1)- P(n) C(n+1)- C(n) × (concentration of each pollutant measured - C(n))] + P(n) Given the concentration of each pollutant (with units as stated in the table above), where C(n+1) > concentration of each pollutant measured > Cn. The highest PSI pollutant value calculated for the 5 pollutants will be taken as the overall PSI for that area. In Singapore, the 24-hr overall PSI is used by the National Environmental Agency (NEA) to provide health advisory. 24-hr overall PSI Healthy Persons Elderly, Pregnant women & children Persons with chronic lung disease, heart disease and stroke <100 Normal activities 101-200 Minimise prolonged or strenuous outdoor physical exertion. Minimise prolonged outdoor activity. Avoid all outdoor activities. If outdoor activity is unavoidable, wear N95 mask. 201-300 Avoid all outdoor activities. If outdoor activity is unavoidable, wear N95 mask. Avoid all outdoor activities. If outdoor activity is unavoidable, wear N95 mask (for adults). >300 Minimise all outdoor exposure. If outdoor activity is unavoidable, wear N95 mask. (This question continues on the following page)

3 (Question 1 continued) (a) (i) In a 1