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1 Write your name here Surname Other names Edexcel GCSE Centre Number Candidate Number Chemistry/Additional Science Unit C2: Discovering Chemistry Foundation Tier Thursday 13 June 2013 Morning Time: 1 hour You must have: Calculator, ruler Paper Reference 5CH2F/01 Total Marks Instructions Use black ink or ball-point pen. Fill in the boxes at the top of this page with your name, centre number and candidate number. Answer all questions. Answer the questions in the spaces provided there may be more space than you need. Information The total mark for this paper is 60. The marks for each question are shown in brackets use this as a guide as to how much time to spend on each question. Questions labelled with an asterisk (*) are ones where the quality of your written communication will be assessed you should take particular care with your spelling, punctuation and grammar, as well as the clarity of expression, on these questions. Advice Read each question carefully before you start to answer it. Keep an eye on the time. Try to answer every question. Check your answers if you have time at the end. You should use a calculator in this examination. Turn over P41938A 2013 Pearson Education Ltd. 1/1/1/1/ *P41938A0120*
2 The Periodic Table of the Elements Key 1 H hydrogen 1 4 He helium 2 7 Li lithium 3 9 Be beryllium 4 relative atomic mass atomic symbol name atomic (proton) number 11 B boron 5 12 C carbon 6 14 N nitrogen 7 16 O oxygen 8 19 F fluorine 9 20 Ne neon Na sodium Mg magnesium Al aluminium Si silicon P phosphorus S sulfur Cl chlorine Ar argon K potassium Ca calcium Sc scandium Ti titanium V vanadium Cr chromium Mn manganese Fe iron Co cobalt Ni nickel Cu copper Zn zinc Ga gallium Ge germanium As arsenic Se selenium Br bromine Kr krypton Rb rubidium Sr strontium Y yttrium Zr zirconium Nb niobium Mo molybdenum 42 [98] Tc technetium Ru ruthenium Rh rhodium Pd palladium Ag silver Cd cadmium In indium Sn tin Sb antimony Te tellurium I iodine Xe xenon Cs caesium Ba barium La* lanthanum Hf hafnium Ta tantalum W tungsten Re rhenium Os osmium Ir iridium Pt platinum Au gold Hg mercury Tl thallium Pb lead Bi bismuth 83 [209] Po polonium 84 [210] At astatine 85 [222] Rn radon 86 [223] Fr francium 87 [226] Ra radium 88 [227] Ac* actinium 89 [261] Rf rutherfordium 104 [262] Db dubnium 105 [266] Sg seaborgium 106 [264] Bh bohrium 107 [277] Hs hassium 108 [268] Mt meitnerium 109 [271] Ds darmstadtium 110 [272] Rg roentgenium 111 Elements with atomic numbers have been reported but not fully authenticated * The lanthanoids (atomic numbers 58-71) and the actinoids (atomic numbers ) have been omitted. The relative atomic masses of copper and chlorine have not been rounded to the nearest whole number. 2 *P41938A0220*
3 Answer ALL questions 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. Groups in the periodic table 1 The periodic table is very useful to chemists. (a) Complete the sentence by putting a cross ( ) in the box next to your answer. The periodic table is a table of A mixtures B C elements compounds D solutions (b) Complete the sentence by putting a cross ( Group 1 in the periodic table contains A transition metals ) in the box next to your answer. B C noble gases halogens D alkali metals *P41938A0320* 3 Turn over
4 (c) The table shows some of the gases in group 0 and some of their properties. The gases are shown in the order in which they appear in group 0. (i) Fill in the three spaces in the table. (3) gas atomic symbol density / g dm 3 reaction with metals helium He 0.12 no reaction neon Ne 1.44 no reaction argon Ar no reaction krypton 3.00 no reaction xenon Xe 3.56 (ii) Some light bulbs contain a metal filament. These light bulbs are filled with argon. Explain why argon, instead of air, is used inside these light bulbs. 4 *P41938A0420*
5 (d) The table shows some solids and some properties of solids. Draw one straight line from each solid to properties of that solid. solid iodine properties of solid a soft metal that reacts vigorously with water a grey solid that forms a purple vapour when heated potassium a yellow solid that does not conduct electricity copper a red-brown solid that reacts to form blue compounds (Total for Question 1 = 9 marks) *P41938A0520* 5 Turn over
6 BLANK PAGE 6 *P41938A0620*
7 Water 2 (a) A separating funnel is shown. The separating funnel can be used to separate two immiscible liquids, such as oil and water. Describe how you would use a separating funnel to separate two immiscible liquids. *P41938A0720* 7 Turn over
8 (b) Paper chromatography can be used to separate coloured substances. A student carried out a chromatography experiment on four food colourings. The four food colourings were brown, green, yellow and red. The diagram shows the results. solvent front start line brown colouring green colouring yellow colouring red colouring Use the results of the chromatography experiment to describe the colours present in the brown food colouring. 8 *P41938A0820*
9 (c) An experiment is carried out on two solutions to see if they conduct electricity. The apparatus used is shown. d.c. supply light bulb solution The two solutions used are sodium chloride solution and sucrose solution. Sodium chloride is an ionic compound. Sucrose is a simple molecular, covalent compound. Explain what happens when each solution is tested in the circuit shown. (3) (d) Calculate the relative formula mass of water, H 2 O. (Relative atomic masses: H = 1.0, O = 16) relative formula mass =... (Total for Question 2 = 8 marks) *P41938A0920* 9 Turn over
10 Atomic structure and the periodic table 3 (a) Complete the sentence by putting a cross ( ) in the box next to your answer. The particles in atoms are electrons, neutrons and protons. The mass of an electron is A greater than the mass of a neutron B C the same as the mass of a proton smaller than the mass of a proton D the same as the mass of a neutron (b) The atomic number of oxygen is 8. The mass number of an atom of oxygen is 17. Describe the number and type of particles in the nucleus of this atom. (c) Sulfur and oxygen are both in group 6 of the periodic table. Explain, in terms of their electronic configurations, why they are both in group *P41938A01020*
11 (d) An atom of phosphorus contains 15 electrons. Describe how these 15 electrons are arranged in a phosphorus atom. (e) Phosphorus oxide is a compound that contains covalent bonds. (i) Describe what is meant by a covalent bond. (ii) The formula of a molecule of phosphorus oxide is P 4 O 10. Give the empirical formula of this oxide.... (Total for Question 3 = 10 marks) *P41938A01120* 11 Turn over
12 Calcium carbonate 4 (a) Calcium nitrate solution reacts with sodium carbonate solution. The products are calcium carbonate and another salt. Write the word equation for this reaction. (b) (i) Complete the sentence by putting a cross ( ) in the box next to your answer. The colour produced in a flame test by calcium ions is A green B C lilac orange-red D yellow (ii) Describe how a flame test is carried out on a solid. (c) If calcium carbonate is heated strongly, it decomposes. CaCO 3 CaO + CO 2 If 100 g of calcium carbonate is heated a calculation shows that 44 g carbon dioxide should be formed. (i) In an experiment 100 g of calcium carbonate was heated and only 40 g carbon dioxide was formed. Calculate the percentage yield of carbon dioxide in this reaction. percentage yield of carbon dioxide =... % 12 *P41938A01220*
13 (ii) Suggest a reason why only 40 g of carbon dioxide was formed in the experiment. (d) Complete the sentence by putting a cross ( ) in the box next to your answer. Ionic compounds A conduct electricity when solid B C do not conduct electricity when molten have low boiling points D have high melting points (Total for Question 4 = 9 marks) *P41938A01320* 13 Turn over
14 Barium sulfate 5 (a) Barium sulfate contains barium ions, Ba 2+ sulfate ions, SO 4 2 (i) Give the formula of barium sulfate. (ii) Give the meaning of the term ion. (b) This is an X-ray photograph of part of a patient s body. Before the photograph was taken a suspension of barium sulfate was introduced into his body to show the required part. Many barium salts are toxic. Barium sulfate is insoluble in water. Source: andi-sheba.blogspot.com Explain why it is safe for the patient to have barium sulfate in his body. 14 *P41938A01420*
15 *(c) Barium sulfate is prepared by reacting barium chloride with sodium sulfate. The barium sulfate is formed as a precipitate. Describe an experiment to prepare a pure, dry sample of barium sulfate, starting with barium chloride crystals and sodium sulfate crystals. (6) (d) Barium reacts with chlorine to produce barium chloride, BaCl 2. Write the balanced equation for this reaction.. (Total for Question 5 = 12 marks) *P41938A01520* 15 Turn over
16 BLANK PAGE 16 *P41938A01620*
17 Reactions 6 (a) A technician made some dilute sodium hydroxide solution by carefully adding some solid sodium hydroxide to pure water. This is the hazard symbol on a bottle of solid sodium hydroxide. (i) State what this symbol shows about sodium hydroxide. (ii) Sodium hydroxide solution reacts with dilute hydrochloric acid. During the reaction heat is released. What type of reaction is this? Put a cross ( ) in the box next to your answer. A B C displacement endothermic neutralisation D precipitation *P41938A01720* 17 Turn over
18 (b) A catalyst is added to some reactions. Explain the meaning of catalyst. (c) Dilute hydrochloric acid reacts with calcium carbonate to produce carbon dioxide gas. Three different experiments were carried out using large pieces of calcium carbonate, small pieces of calcium carbonate and powdered calcium carbonate. The size of the calcium carbonate pieces was the only factor that was changed. In each experiment the volume of carbon dioxide released in five minutes was measured. The results are size of calcium carbonate pieces used volume of carbon dioxide released in five minutes / cm 3 large 3 small 7 powdered 50 Describe what this shows about the effect of the surface area of calcium carbonate on the rate of this reaction. 18 *P41938A01820*
19 *(d) Hydrochloric acid reacts with magnesium metal to produce hydrogen gas. magnesium + hydrochloric acid magnesium chloride + hydrogen Describe how you could use magnesium ribbon and a solution of hydrochloric acid to show that decreasing the concentration of the hydrochloric acid changes the rate of this reaction. (6) (Total for Question 6 = 12 marks) TOTAL FOR PAPER = 60 MARKS *P41938A01920* 19
20 BLANK PAGE 20 *P41938A02020*
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