AQA GCSE Combined Science: Trilogy Chemistry Paper 2F June 2024 PDF

Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. GCSE COMBINED SCIENCE: TRILOGY Foundation Tier...

Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. GCSE COMBINED SCIENCE: TRILOGY Foundation Tier F Chemistry Paper 2F Tuesday 11 June 2024 Morning Time allowed: 1 hour 15 minutes Materials For Examiner’s Use For this paper you must have: a ruler Question Mark a scientific calculator 1 the periodic table (enclosed). 2 Instructions 3 Use black ink or black ball-point pen. 4 Pencil should only be used for drawing. Fill in the boxes at the top of this page. 5 Answer all questions in the spaces provided. 6 If you need extra space for your answer(s), use the lined pages at the end of 7 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 TOTAL marked. In all calculations, show clearly how you work out your answer. Information The maximum mark for this paper is 70. The marks for questions are shown in brackets. You are expected to use a calculator where appropriate. You are reminded of the need for good English and clear presentation in your answers. *JUN248464c2F01* IB/M/Jun24/G4005/E7 8464/C/2F  2 Do not write outside the 0 1 box The Earth’s atmosphere has changed during the last 4.6 billion years. 0 1. 1 What is the approximate percentage of nitrogen and of oxygen in the Earth’s atmosphere today? Draw one line from each gas to the percentage of that gas. [2 marks] 0 1. 2 The approximate percentage of carbon dioxide in the Earth’s early atmosphere was 95%. Which are two reasons why the percentage of carbon dioxide has decreased since the Earth’s early atmosphere? [2 marks] Tick () two boxes. Combustion of fuels Deforestation Dissolving in oceans Photosynthesis Respiration *02* IB/M/Jun24/8464/C/2F  3 Do not write outside the 0 1. 3 Figure 1 shows the change in the percentage of carbon dioxide in the Earth’s box atmosphere from 1800 to 2020. Figure 1 Describe the trend in the percentage of carbon dioxide in the Earth’s atmosphere from 1800 to 2020. Use data from Figure 1. [3 marks] Turn over ► *03* IB/M/Jun24/8464/C/2F  4 Do not write outside the box Carbon dioxide is a greenhouse gas. 0 1. 4 Which of the following is also a greenhouse gas? [1 mark] Tick () one box. Argon Methane Nitrogen Oxygen 0 1. 5 Which of the following is an environmental problem caused by greenhouse gases? [1 mark] Tick () one box. Acid rain Climate change Global dimming *04* IB/M/Jun24/8464/C/2F  5 Do not write outside the 0 1. 6 Calculate the relative formula mass (Mr) of carbon dioxide (CO2). box Relative atomic masses (Ar): C = 12 O = 16 [2 marks] Relative formula mass of carbon dioxide = 11 Turn over for the next question Turn over ► *05* IB/M/Jun24/8464/C/2F  6 Do not write outside the There are no questions printed on this page box DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED *06* IB/M/Jun24/8464/C/2F  7 Do not write outside the 0 2 Different tests can be used to identify chemicals. box 0 2. 1 A student measured the melting points of four substances. Table 1 shows the results. Table 1 Substance Melting point in °C A 52 to 54 B 61 C –2 to 0 D 80 to 82 Which substance was pure? Give one reason for your answer. [2 marks] Substance Reason Question 2 continues on the next page Turn over ► *07* IB/M/Jun24/8464/C/2F  8 Do not write outside the box Anhydrous copper sulfate can be used to test for water. The word equation for the reaction is: anhydrous copper sulfate + water ⇌ hydrated copper sulfate 0 2. 2 Complete the sentence. Choose answers from the box. [2 marks] blue green red white yellow When water is added to anhydrous copper sulfate, the colour changes from to. 0 2. 3 The reaction between anhydrous copper sulfate and water is reversible. How does the word equation show that the reaction is reversible? [1 mark] *08* IB/M/Jun24/8464/C/2F  9 Do not write outside the 0 2. 4 The formula of anhydrous copper sulfate is CuSO4 box What is the total number of atoms in the formula CuSO4? [1 mark] Tick () one box. 3 4 6 7 0 2. 5 Chlorine is a gas. Describe the test for chlorine. Give the result. [2 marks] Test Result 8 Turn over for the next question Turn over ► *09* IB/M/Jun24/8464/C/2F  10 Do not write outside the 0 3 Printer ink is a mixture of chemicals. box 0 3. 1 What is the name given to a mixture that has been designed as a useful product? [1 mark] Tick () one box. Formula Formulation Fraction A student used chromatography to investigate the colours in a printer ink. Figure 2 shows the chromatogram. Figure 2 *10* IB/M/Jun24/8464/C/2F  11 Do not write outside the 0 3. 2 The student used a ruler for the start line. box What would the student have used to draw the start line? Give one reason for your answer. [2 marks] Reason 0 3. 3 Determine the Rf value of the red colour. Use the equation: distance moved by colour Rf = distance moved by solvent [4 marks] Distance moved by red colour Distance moved by solvent Rf = Question 3 continues on the next page Turn over ► *11* IB/M/Jun24/8464/C/2F  12 Do not write outside the 0 3. 4 Table 2 shows the Rf values of four blue colours. box Table 2 Blue colour Rf Cerulean 0.40 Cobalt 0.15 Prussian 0.88 Ultramarine 0.68 The student determined that the Rf value of the blue colour in the printer ink was 0.86 Suggest which blue colour was used in the printer ink. Give one reason for your answer. [2 marks] Blue colour Reason 9 *12* IB/M/Jun24/8464/C/2F  13 Do not write outside the 0 4 Tap water must be safe to drink. box 0 4. 1 What name is given to water that is safe to drink? [1 mark] Tick () one box. Ground water Potable water Waste water 0 4. 2 Water is sterilised to make the water safe to drink. Which two of the following are used to sterilise drinking water? [2 marks] Tick () two boxes. Carbon dioxide Electrolysis Filtration Ozone Ultraviolet light Question 4 continues on the next page Turn over ► *13* IB/M/Jun24/8464/C/2F  14 Do not write outside the A student investigated the mass of dissolved solids in samples of river water, box sea water and tap water. This is the method used. 1. Weigh an evaporating basin. 2. Measure 100 cm3 of river water. 3. Pour the river water into the evaporating basin. 4. Heat the evaporating basin until all the water has evaporated. 5. Weigh the evaporating basin and dissolved solids. 6. Calculate the mass of dissolved solids in the water. 7. Repeat steps 1 to 6 with sea water and then with tap water. 0 4. 3 Which is the most suitable equipment to measure 100 cm3 of water? [1 mark] Tick () one box. Beaker Conical flask Measuring cylinder *14* IB/M/Jun24/8464/C/2F  15 Do not write outside the 0 4. 4 Table 3 shows the results. box Table 3 Mass in grams Type of water Evaporating Evaporating basin and Dissolved basin dissolved solids solids River 112.1 113.1 1.0 Sea 110.5 114.0 X Tap 115.3 115.4 0.1 Calculate value X in Table 3. [1 mark] X= g 0 4. 5 Identify the variables used in the investigation. Draw one line from each variable to the example of the variable. [2 marks] Turn over ► *15* IB/M/Jun24/8464/C/2F  16 Do not write outside the Table 4 shows the mass of different types of ions dissolved box in 1 dm3 of sea water. Table 4 Mass of type of ion dissolved in Type of ion 1 dm3 of sea water in grams Calcium 0.4 Magnesium 1.3 Sulfate 2.7 *16* IB/M/Jun24/8464/C/2F  17 Do not write outside the 0 4. 6 Complete Figure 3. box You should: complete the scale for the y-axis plot the data from Table 4 as a bar chart. [3 marks] Figure 3 10 Turn over for the next question Turn over ► *17* IB/M/Jun24/8464/C/2F  18 Do not write outside the 0 5 Life cycle assessments (LCAs) are used to assess the environmental impact of box different products. 0 5. 1 212 million kilograms of aluminium is used for packaging in the UK each year. 68.0% of aluminium packaging is recycled. Calculate the mass of aluminium packaging that is recycled in the UK each year. [2 marks] Mass of aluminium recycled = million kg *18* IB/M/Jun24/8464/C/2F  19 Do not write outside the 0 5. 2 Drinks cans are made from aluminium. box An aluminium can has a mass of 15.8 g. 1000 g = 1 kg Calculate the whole number of aluminium cans that can be made from 4.00 kg of aluminium. [4 marks] Whole number of cans = Question 5 continues on the next page Turn over ► *19* IB/M/Jun24/8464/C/2F  20 Do not write outside the 0 5. 3 Table 5 shows three methods used to dispose of wood and steel after use. box Table 5 Percentage (%) of material disposed of by each method As waste Recycled Burnt Wood 58 36 6 Steel 15 85 0 Evaluate the sustainability of the disposal of wood and steel. [4 marks] 10 *20* IB/M/Jun24/8464/C/2F  21 Do not write outside the 0 6 Alkanes and alkenes are hydrocarbons. box 0 6. 1 Define the term ‘hydrocarbon’. [1 mark] 0 6. 2 The general formula for alkanes is CnH2n+2 Determine the formula of the alkane with 10 carbon atoms. [1 mark] Formula = Question 6 continues on the next page Turn over ► *21* IB/M/Jun24/8464/C/2F  22 Do not write outside the 0 6. 3 Crude oil is a mixture of hydrocarbons. box Figure 4 represents industrial equipment used to separate crude oil into fractions. Figure 4 Explain how crude oil is separated into fractions. Use Figure 4. [4 marks] *22* IB/M/Jun24/8464/C/2F  23 Do not write outside the 0 6. 4 The alkane molecule C14H30 can be cracked to produce smaller molecules. box Balance the equation for the reaction. [1 mark] C14H30 → C8H18 + C3H6 Question 6 continues on the next page Turn over ► *23* IB/M/Jun24/8464/C/2F  24 Do not write outside the box Propene (C3H6) is an alkene. 0 6. 5 Describe the test for alkenes. Give the result. [2 marks] Test Result 0 6. 6 Poly(propene) is made from propene. Figure 5 represents the repeating unit of poly(propene). Figure 5 What type of substance is poly(propene)? [1 mark] 10 *24* IB/M/Jun24/8464/C/2F  25 Do not write outside the 0 7 Some factors affect the rates of chemical reactions. box 0 7. 1 A student investigated the effect of changing the particle size of calcium carbonate on the rate of reaction with hydrochloric acid. Figure 6 shows the apparatus. Figure 6 Describe a method the student could use to produce valid results. [6 marks] Turn over ► *25* IB/M/Jun24/8464/C/2F  26 Do not write outside the 0 7. 2 The student investigated the effect of increasing the temperature on the box rate of a reaction. Explain the effect of increasing the temperature on the rate of a reaction. Refer to particles and collisions in your answer. [3 marks] *26* IB/M/Jun24/8464/C/2F  27 Do not write outside the Catalysts affect the rate of reactions. box 0 7. 3 What is meant by a ‘catalyst’? [2 marks] 0 7. 4 What are catalysts in biological systems called? [1 mark] 12 END OF QUESTIONS *27* IB/M/Jun24/8464/C/2F  28 Do not write outside the There are no questions printed on this page box DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED *28* IB/M/Jun24/8464/C/2F  29 Do not write outside the box Question Additional page, if required. number Write the question numbers in the left-hand margin. *29* IB/M/Jun24/8464/C/2F  30 Do not write outside the box Question Additional page, if required. number Write the question numbers in the left-hand margin. *30* IB/M/Jun24/8464/C/2F  31 Do not write outside the box Question Additional page, if required. number Write the question numbers in the left-hand margin. *31* IB/M/Jun24/8464/C/2F  32 Do not write outside the There are no questions printed on this page box DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED Copyright information For confidentiality purposes, all acknowledgements of third-party copyright material are published in a separate booklet. 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