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Download AQA GCSE CHEMISTRY Higher Tier Paper 1 2025/2026 Questions Combined With Marking Scheme and more Exams Medicine in PDF only on Docsity!
Please write clearly in block capitals. Centre number Candidate number Sumame Forename(s) Candidate signature GCSE CHEMISTRY Higher Tier Paper 1 | declare this is my own work. Monday 19 May 2025. = Morning Time allowed: 1 hour 45 minutes Materials For Examiner's Use For this paper you must have: © aruler Question Mark * ascientific calculator « the periodic table (enclosed). Instructions e 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 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. TOTAL e|Nloalalalelrn|a Information ¢ The maximum mark for this paper is 100. « The marks for questions are shown in brackets. You are expected to use a calculator where appropriate. In all calculations, show clearly how you work out your answer. You are reminded of the need for good English and clear presentation in your answers. JUN2584621HO1 varoveeoren 8462/1H Donot write outside the box [3] Asodium atom can be represented as *?Na Complete Figure 1 to show the electronic structure of a sodium atom. [1 mark] Figure 1 [4] Mendeleev created an early periodic table. Mendeleev placed most of the elements in order of atomic weight. Tellurium and iodine were not placed in order of atomic weight. Why did Mendeleev not place tellurium and iodine in order of atomic weight? [1 mark] [5] Argon is an element in Group 0 of the periodic table. Explain why argon is unreactive. [2 marks] Turn over> 02 IBIM/Jun25/8462/1H An element X consists of two isotopes. [6] What is meant by ‘isotopes’? Answer in terms of subatomic particles. [2 marks] Table 1 Mass number Percentage abundance (%) 113 4 115 96 Which is the closest estimate to the relative atomic mass of X? Tick (W) one box. ~113 ~114 ~115 Table 1 shows the mass numbers and percentage abundances of the isotopes of X. [1 mark] Donot write outside the box 02 IB/M/Jun25/8462/1H Donot write outside the [2] Calcium is in Group 2 of the periodic table. box Sulfur is in Group 6 of the periodic table. Describe what happens when a calcium atom reacts with a sulfur atom. Answer in terms of electrons and ions. [4 marks] 02 IBIM/Jun25/8462/1H Figure 3 shows the structure of graphite. Figure 3 Key @ Carbon atom [3] Describe the structure and bonding of graphite. [4 marks] Extra space 02 Turn over> IB/M/Jun25/8462/1H Donot write outside the box Donot write outside the This question is about metals and metal oxides. box Tin (Sn) is extracted from tin oxide using carbon. The equation for the reaction is: SnOz2 + C — Sn + CO) [4] Which substance is reduced in this reaction? Give one reason for your answer. Answer in terms of oxygen. [2 marks] Substance reduced Reason [2] Why can carbon be used to extract tin from tin oxide? [1 mark] Question 3 continues on the next page Turn over> 02 IB/M/Jun25/8462/1H 10 [3] Cadmium (Cd) can be extracted by the reaction of cadmium oxide with carbon. The equation for the reaction is: CdO + C — Cd + CO Calculate the percentage atom economy for the production of cadmium in this reaction. Relative atomic masses (A): C=12 Cd=112 Relative formula mass (M,): CdO = 128 [3 marks] Percentage atom economy = % [4] Tungsten is a transition metal. Potassium is a Group 1 metal. Give two differences between the properties of tungsten and the properties of potassium. [2 marks] 02 IB/M/Jun25/8462/1H Donot write outside the box 12 Donot write outside the The elements in Group 7 of the periodic table are known as the halogens. box Figure 4 shows information about some of the elements in Group 7. Figure 4 200}- 100}— Temperature in °C -100}— -200+- -300}- Fluorine Chlorine Bromine lodine Element Key: | Melting point im Boiling point IB/M/Jun25/8462/1H a2 13 Donot write outside the [4] Predict the boiling point of chlorine. box Use Figure 4. [1 mark] °C [2] what is the state of fluorine at -250 °C? Use Figure 4. [1 mark] Astatine (At) is an element in Group 7. [3] What is the number of electrons in the outer shell of an astatine atom? [1 mark] [4] Hydrogen reacts with astatine to produce hydrogen astatide. Predict the formula of hydrogen astatide. [1 mark] Question 4 continues on the next page Turn over> 02 IB/M/Jun25/8462/1H 15 Donot write outside the This question is about small particles. ‘box Before the discovery of the electron, atoms were thought to be tiny spheres that could not be divided. [4] The discovery of the electron led to the plum pudding model of the atom. Describe the plum pudding model of the atom. [2 marks] [2] The model of the atom changed again after the alpha particle scattering experiment. Give two conclusions that were made from the alpha particle scattering experiment. [2 marks] 1 2 [3] Niels Bohr made another change to the model of the atom. What was this change? [1 mark] Turn over> 02 IB/M/Jun25/8462/1H 16 [4] Ahelium atom has a radius of 1.4 x 10-° m. The nucleus of this atom has a radius of 1.7 x 10-§ m. How many times larger is the radius of the atom than the radius of the nucleus? Tick (W) one box. ~1000 times larger ~10 000 times larger ~100 000 times larger ~1 000 000 times larger [1 mark] 02 IB/M/Jun25/8462/1H Donot write outside the ‘box 18 oma out Aluminium is extracted by the electrolysis of a molten mixture. box The mixture contains aluminium oxide and one other substance. [4] Aluminium oxide is an ionic compound. Explain why aluminium oxide has a very high melting point. [4 marks] Extra space [2] Name the substance added to aluminium oxide to form the mixture. [1 mark] [3] Give one reason why a mixture is used as the electrolyte. [1 mark] 02 IB/M/Jun25/8462/1H 19 oma Oxygen is produced at the positive electrode. oe pox [4] Write the half equation for the reaction that produces oxygen at the positive electrode. [2 marks] — + [5] The positive electrode must be continually replaced. Explain why. [3 marks] 11 Turn over for the next question Turn over> IB/M/Jun25/8462/1H 02 
