Chemistry

2 © OCR 2023 1 The increase in global population means there is a greater need for drinking water. (a) What is the correct term for drinking water? Tick () one box. Ground water Potable water Sea water Waste water [1] (b) One source of drinking water is salt water. Describe a process that separates water from salt water. ................................................................................................................................................... .................

2 © OCR 2023 Section A You should spend a maximum of 30 minutes on this section. Write your answer to each question in the box provided. 1 Crude oil is a resource that is being made extremely slowly. Which word describes a resource that is being made extremely slowly? A Finite B Hydrocarbon C Non‑renewable D Petrochemical Your answer [1] 2 The Group 7 element fluorine is a gas at room temperature and pressure. The Group 7 elements show a trend in boiling points going down the gro...

2 © OCR 2023 Section A You should spend a maximum of 30 minutes on this section. Write your answer to each question in the box provided. 1 Which term is a correct description of ice turning from a solid to a liquid? A Chemical change B Evaporation C Freezing D Physical change Your answer [1] 2 Which equipment is needed for distillation? A Condenser, funnel, thermometer B Condenser, round-bottomed flask, thermometer C Thermometer, beaker, pH probe D Thermometer, measuring cylinder...

2 © OCR 2023 Section A You should spend a maximum of 30 minutes on this section. Write your answer to each question in the box provided. 1 A student does a flame test with a sample of potassium chloride. Which colour is the flame? A Lilac B Green‑blue C Red D Yellow Your answer [1] 2 What is the test for chlorine gas? A Damp universal indicator paper turns red then white B Decolourises bromine water C Limewater turns milky D Relights a glowing splint Your answer [1] 3 Why do...

2 © OCR 2023 Section A You should spend a maximum of 30 minutes on this section. Write your answer to each question in the box provided. 1 Where is most of the mass found in an atom? A Electrons B Neutrons C Nucleus D Protons Your answer [1] 2 Sodium fluoride has the formula NaF. The formula of the sodium ion is Na+ . What is the formula of the fluoride ion? A F + B F – C F 2+ D F 2– Your answer [1] 3 Which row of results shows that the pH of a solution is acidic? pH...

Generic Marking Principles These general marking principles must be applied by all examiners when marking candidate answers. They should be applied alongside the specific content of the mark scheme or generic level descriptors for a question. Each question paper and mark scheme will also comply with these marking principles. GENERIC MARKING PRINCIPLE 1: Marks must be awarded in line with: • the specific content of the mark scheme or the generic level descriptors for the question ...

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Test Bank for Chemistry: The Molecular Nature of Matter, 8th Edition 8e by Neil D. Jespersen, Alison Hyslop. Full Chapters test bank are included with answers - Chapter 1 to 22 included 0 A Very Brief History of Chemistry 1 0.1 Chemistry’s Important Concepts 2 0.2 Supernovas and the Elements 3 0.3 Elements and the Earth 5 0.4 Dalton’s Atomic Theory 7 0.5 Internal Structure of the Atom 8 Tools for Problem Solving 20 Review Questions and Problems 21 1 Scientific Meas...