4 (a) A company makes glass using silica, soda, lime and magnesia. The table gives information about the proportions used. Percentage of total mass Pie chart sector angle Silica 75 270° Soda 15 Lime and magnesia 10 (i) Complete the table. [2] (ii) Complete the pie chart to show this information. 270° Silica [1] (iii) The masses of lime and magnesia used are in the ratio lime : magnesia = 3 : 2. Find the percentage of the total mass of glass that is magnesia. ..............................................% [1] (iv) The company uses 8.25 kg of soda to make some glass. Work out how many kilograms of silica they use. ............................................. kg [2] © UCLES 2023 0580/33/O/N/23 9 (b) The company uses the formula M = 2.5#A#T to find the mass of a sheet of glass. M is the mass in kilograms. A is the area in square metres. T is the thickness in millimetres. Use the formula to calculate the mass of a rectangular sheet of glass that is 1.9 m long, 0.6 m wide and 8 mm thick. ............................................. kg [2] (c) In one year, 130 000 000 tonnes of glass were produced worldwide. Write this number in standard form. ................................................. [1] (d) The company sets targets to recycle its waste materials. The bar chart shows the target rate and the actual rate for some of its recycling. Key: Metal Target rate Actual rate Paper & cardboard Glass Plastic Wood 0 10 20 30 40 50 60 70 80 90 100 Percentage recycling rate (i) The target rate for recycling glass was 55%. The actual rate for recycling glass was 70%. Complete the bar chart. [2] (ii) Which materials did the company recycle at more than double their target rate? ...................................................................................... [2] © UCLES 2023 0580/33/O/N/23 [Turn over 10