A Level Chemistry B H433/01 Question Paper 2021

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Tuesday 5 October 2021 – Afternoon A Level Chemistry B (Salters) H433/01 Fundamentals of Chemistry Time allowed: 2 hours 15 minutes INSTRUCTIONS • Use black ink. You can use an HB pencil, bu... t only for graphs and diagrams. • Write your answer to each question in the space provided. If you need extra space use the lined pages at the end of this booklet. The question numbers must be clearly shown. • Answer all the questions. • Where appropriate, your answer should be supported with working. Marks might be given for using a correct method, even if your answer is wrong. INFORMATION • The total mark for this paper is 110. • The marks for each question are shown in brackets [ ]. • Quality of extended response will be assessed in questions marked with an asterisk (*). • This document has 32 pages. ADVICE • Read each question carefully before you start your answer You should spend a maximum of 40 minutes on this section. Write your answer to each question in the box provided. Answer all the questions. 1 Chlorine-35 is an isotope of chlorine. What is correct about an atom of chlorine-35? A It has 35 electrons. B It has 35 neutrons. C It has 35 protons. D It has 35 protons plus neutrons. Your answer [1] 2 What is meant by ‘heating to constant mass’? A Heating a sample for a long time. B Heating a sample, then weighing, then heating and weighing again several times. C Weighing a sample several times after heating it. D Weighing a sample several times before heating it. Your answer [1] 3 Which of these provides evidence that electrons are arranged in shells within atoms? A atomic spectra B electrolysis C the discovery of the neutron D the Geiger-Marsden experiment Your answer [1] 3 © OCR 2021 Turn over 4 Which equation represents the enthalpy change of formation of CO2? A C(s) + 2O(g) CO2(g) [Show More]

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