A-Level Environmental Science Paper 1

Materials For this paper you may use: • a calculator. Instructions • Use black ink or black ball-point pen. Pencil should only be used for drawing. • Fill in the boxes at the top of this page. • Answer all questions 1 to 10 and one essay from question 11. • You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. • If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s). • Do all rough work in this book. Cross through any work you do not want to be marked. Information • The marks for questions are shown in brackets. • The maximum mark for this paper is 120. • All questions should be answered in continuous prose. • You will be assessed on your ability to: – use good English – organise information clearly – use specialist vocabulary where appropriate. Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. A-level ENVIRONMENTAL SCIENCE Paper 1 2 *02* IB/G/Jun21/7447/1 Do not write outside the Answer all questions in the spaces provided. box 0 1 Table 1 shows some treatment processes that are used to remove specific contaminants from water. Complete Table 1 by adding one or more ticks to each row to identify which treatment processes are used to remove each specific contaminant. The first row has been completed for you. [5 marks] Table 1 Contaminant Treatment process Activated carbon filtration Phytoremediation Reverse osmosis Screening Sedimentation UV light Salt Heavy metals Litter Organic pollutants Pathogens Suspended solids 5 3 *03* Turn over ► IB/G/Jun21/7447/1 Do not write outside the 0 2 box The Rowland-Molina hypothesis explains how the properties of chlorofluorocarbons (CFCs) may cause ozone depletion in the stratosphere. 0 2 . 1 Describe two chemical properties of CFCs on which the Rowland-Molina hypothesis is based. [2 marks] 1 2 Question 2 continues on the next page 4 *04* IB/G/Jun21/7447/1 Do not write outside the Figure 1 shows changes in the area of ozone depletion in the stratosphere from box 1979 to 2017 over the Southern Hemisphere. Figure 1 0 2 . 2 Use the trend line in Figure 1 to calculate the mean annual rate of decrease in the area of ozone depletion over the Southern Hemisphere from 2003 to 2017. Give your answer to two significant figures. Show your working. [2 marks]