BTEC Chem Mock Paper Jan 2023 (PDF)

Please check the examination details below before entering your candidate information Candidate surname Other names Centre Number Learner Registration Number...

Please check the examination details below before entering your candidate information Candidate surname Other names Centre Number Learner Registration Number Pearson BTEC Level 3 Nationals Certificate, Extended Certificate, Foundation Diploma, Diploma, Extended Diploma Time 40 minutes Paper reference 31617H/1C Applied Science/Forensic and Criminal Investigation UNIT 1: Principles and Applications of Science I Chemistry SECTION B: PERIODICITY AND PROPERTIES OF ELEMENTS You must have: Total Marks a calculator and a ruler. Instructions Use black ink or ball-point pen. Fill in the boxes at the top of this page with your name, centre number and learner registration number. Answer all questions. Answer the questions in the spaces provided – there may be more space than you need. Information The exam comprises three papers worth 30 marks each: – Section A: Structures and Functions of Cells and Tissues (Biology) – Section B: Periodicity and Properties of Elements (Chemistry) – Section C: Waves in Communication (Physics). The total mark for this exam is 90. The marks for each question are shown in brackets – use this as a guide as to how much time to spend on each question. The periodic table of elements can be found at the back of this paper. Advice Read each question carefully before you start to answer it. Try to answer every question. your answers if you have time at the end. Check Turn over P74551A ©2023 Pearson Education Ltd. 1/1/1/ *P74551A0112*  Answer ALL questions. Write your answers in the spaces provided. Some questions must be answered with a cross in a box. If you change your mind about an answer, put a line through the box and then mark your new answer with a cross. 1 (a) In the periodic table, the elements are placed in different blocks. (i) Figure 1 shows an outline of part of the periodic table. The shapes show the positions of four elements. Figure 1 Identify the shape that shows the position of a d-block element in the periodic table. (1) A X B C D (ii) State one chemical property of a d-block element. (1) Multiple oxidation states.................................................................................................................................................................................................................................................................................... 2 *P74551A0212*  (b) Platinum is a d-block element. (i) The relative atomic mass of platinum is 195.1. Explain why the relative atomic mass of platinum is not a whole number. (3) There are many isotopes of this element. Some atoms vary in mass.................................................................................................................................................................................................................................................................................... so it cannot be a set mass. The relative atomic mass is an average of the masses of isotopes included.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... (ii) Describe the structure and bonding of platinum. You may draw a labelled diagram to support your answer. (4).................................................................................................................................................................................................................................................................................... Platinum is metalically bonded, meaning there is a strong.................................................................................................................................................................................................................................................................................... attraction between the surrounding sea of positive ions and the delocalised electrons within platinum. It has a regular latttice.................................................................................................................................................................................................................................................................................... formation, and is a giant lattice meaning it is very strong-.................................................................................................................................................................................................................................................................................... requiring large quantities of energy to destory the bonds within.................................................................................................................................................................................................................................................................................... it............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. (Total for Question 1 = 9 marks) 3 *P74551A0312* Turn over 2 Lithium, sodium and potassium are some of the elements in group 1 of the periodic table. (a) State, in terms of their electronic configuration, why these elements are all placed in the same group. (1) They each only have one electron in their outer shell........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ (b) When potassium reacts with water, a flame is seen. Potassium hydroxide solution and hydrogen gas are produced. (i) Identify the colour of the flame. (1) X A lilac B orange C red D yellow (ii) The balanced equation for the reaction is............... ) + 2H2O(........L 2K(........S Aq............... ) → 2KOH(...... G................. ) + H2(....................... ) Add the state symbols aq, g, l and s to the balanced equation. You must only use each state symbol once. (2) (iii) Explain, in terms of change in oxidation number, which element is reduced in the reaction. (2) Hydrogen, the oxidation number has changed from +1 to 0................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4 *P74551A0412* (c) A piece of potassium has a mass of 1.564 g. (i) Calculate the number of moles in this piece of potassium. (relative atomic mass of potassium = 39.1) (1) number of moles =.......0.04....................................................... (ii) The piece of potassium was reacted with water. The total volume of the solution produced was 5.0 dm3. Calculate the concentration of the solution produced in mol dm–3. If you did not get an answer for (c)(i), use the value 0.06 for the number of moles. (2) Conc = mol/ vol 0.04 / 5 = 0.008 concentration of solution =......... 0.008..................................................... mol dm –3 (Total for Question 2 = 9 marks) 5 *P74551A0512* Turn over 3 (a) Figure 2 shows a model of an atom. subshells 3s........................ 3p........................ 3d........................ 2s 2p 2s........................ nucleus Figure 2 (i) The model shows three shells of electrons. These shells can be split into subshells. The subshells of the second shell have been completed for you. Complete Figure 2 to show the subshells in the first and third shells. (2) (ii) State the maximum number of electrons that can occupy the 2p subshell. (1) 6.............................................................. 6 *P74551A0612*  (b) Electron affinity is the heat energy change when one mole of gaseous atoms gains one mole of electrons. Table 1 shows the equations and the energy change for the first two electron affinities of oxygen. equation energy change first electron affinity O(g) + e– → O–(g) releases energy second electron affinity O–(g) + e– → O2–(g) requires energy Table 1 Explain why the first electron affinity of oxygen releases energy but the second electron affinity of oxygen requires energy. (3)........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ In the first EA the electron is attracted (to a nucleus of a neutral atom. In the second EA the electron is.................................................................................................................................................................................................................................................................................... added to a negative ion So, in the second EA energy is needed) to overcome repulsion (of.................................................................................................................................................................................................................................................................................... negative ion)........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ (Total for Question 3 = 6 marks) 7 *P74551A0712* Turn over 4 Chlorine is a diatomic molecule, with the formula Cl2. Figure 3 shows molecules of chlorine gas. Figure 3 Discuss the bonding and intermolecular forces in chlorine gas. You may draw diagrams to support your answer. (6)........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 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(Total for Question 4 = 6 marks) TOTAL FOR PAPER = 30 MARKS 9 *P74551A0912*  BLANK PAGE 10 *P74551A01012*  BLANK PAGE 11 *P74551A01112* 12 *P74551A01212*