0620_w20_qp_32
A paper of Chemistry, 0620
Questions:
8
Year:
2020
Paper:
3
Variant:
2
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1
The diagram shows part of the Periodic Table. I II III IV V VI VII VIII Ca Fe Pt Zn Al Cl Br Ar I C O F K Answer the following questions using only the symbols of the elements in the diagram. Each symbol may be used once, more than once or not at all. State the symbol of the element that: provides an inert atmosphere in lamps forms an oxide which is used to neutralise acidic industrial waste has an atom which forms a stable ion by the loss of one electron is a metal used as an inert electrode forms an ion whose aqueous solution gives a green precipitate on addition of aqueous sodiumhydroxide. Chlorine is an element. State the meaning of the term element. An isotope of chlorine is shown. 35Cl Deduce the number of protons and neutrons in this isotope. number of protons number of neutrons  Complete the electronic structure of a chlorine atom. Cl  
2. Atoms, elements and compounds  →  2.2. Atomic structure and the Periodic Table
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The table shows the mass of air pollutants, in nanograms, in 1000 cm3 samples of air taken over a four month period. mass of pollutant in 1000 cm3 of air / nanograms month oxides of nitrogen sulfur dioxide carbon monoxide ozone particulates April 144.3 5.9 2.5 33.9 21.9 May 114.2 2.0 2.1 39.6 21.7 June 110.2 6.1 1.8 31.5 21.3 July 115.4 2.5 2.6 24.2 19.0 Answer these questions using only the information in the table. Name the pollutant that shows a continual decrease in concentration between April and July. Name the pollutant present in the lowest concentration in May. Calculate the mass of carbonmonoxide in 200 cm3 of the sample of air taken in April.  nanograms Sulfurdioxide contributes to acid rain. State one source of the sulfurdioxide in the air. Give one adverse effect of acid rain on buildings. State one use of sulfur dioxide. Sulfurdioxide is oxidised to sulfurtrioxide, SO3. Complete the chemical equation for this reaction. SO2 + O2 → SO3 Complete the energy level diagram for the oxidation of sulfurdioxide to sulfurtrioxide by writing these words on the diagram: ● ● reactants ● ● products. energy progress of reaction  Explain, using information on the energy level diagram, how you know that this reaction is exothermic. Nitrogenmonoxide is a catalyst in the oxidation of sulfurdioxide to sulfurtrioxide. State the meaning of the term catalyst. Sulfurtrioxide reacts with water to form dilute sulfuricacid. Identify which one of these pH values represents the pH of dilute sulfuric acid. Draw a circle around the correct answer. pH 2 pH 7 pH 9 pH 13 Particulates are tiny solid particles in the air. They show Brownian motion. Identify one statement that best describes Brownian motion. Tick one box. The particles move from a higher concentration to a lower concentration. The particles are smaller than oxygen molecules. Brownian motion is an example of diffusion. The particles move in a random zig-zag motion.  
10. Chemistry of the environment  →  10.3. Air quality and climate
6. Chemical reactions  →  6.3. Reversible reactions and equilibrium
6. Chemical reactions  →  6.4. Redox
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Some properties of four substances, E, F, G and H, are shown in the table. substance strength ductility (how easy it is to pull into a wire) electrical conductivity when solid resistance to corrosion E very strong good good very good F weak good good poor G strong not ductile good poor H strong very good very good good Answer these questions using only the information in the table. State which substance, E, F, G or H, is best used to make electricity cables. Explain your answer. substance explanation  State which substance, E, F, G or H, is best used for making cutlery. Explain your answer. substance explanation  
9. Metals  →  9.2. Uses of metals
2. Atoms, elements and compounds  →  2.7. Metallic bonding
2. Atoms, elements and compounds  →  2.4. Ions and ionic bonds
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The structure of compound J is shown. C C O O C H C H H H H H H C C O H H H On the structure, draw a circle around the carboxylic acid functional group. Deduce the formula of compound J to show the number of carbon, hydrogen and oxygen atoms. Complete the table to calculate the relative molecular mass of compound J. Use your Periodic Table to help you. type of atom number of atoms relative atomic mass carbon hydrogen 10 × 1 = 10 oxygen  relative molecular mass = Acids react with bases such as calciumoxide. Complete the word equation for the reaction of hydrochloricacid with calciumoxide. hydrochloric acid + calcium oxide +  The chemical equation for the reaction of lime (calciumoxide) with ammoniumsulfate is shown. CaO + (NH4)2SO4 → CaSO4 + 2NH3 + H2O Name the compound with the formula CaSO4. Complete these phrases about ammonia, NH3, using words from the list. acid blue gaseous green liquid pink solid solution white The state of ammonia at room temperature is . Aqueous ammonia turns damp red litmus paper .  
3. Stoichiometry  →  3.1. Formulae
11. Organic chemistry  →  11.7. Carboxylic acids
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Ethane is an alkane. Draw the structure of ethane to show all of the atoms and all of the bonds.  Complete the chemical equation for the complete combustion of propane. C3H8 + 5O2 → CO2 + H2O Methane is an alkane which is produced by the fractional distillation of petroleum. State one other process which puts methane into the atmosphere. Give one major use of methane. Alkanes and alkenes are hydrocarbons. State the meaning of the term hydrocarbon. Alkanes and alkenes can be distinguished by a chemical test. Name the reagent that can be used to distinguish between alkanes and alkenes. Alkenes are manufactured by cracking alkanes. Name an element that is also produced by cracking alkanes. State one condition required for cracking alkanes. 
11. Organic chemistry  →  11.4. Alkanes
11. Organic chemistry  →  11.5. Alkenes
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Electrolysis is used to extract reactive metals from metal compounds. Describe the electrolysis of molten sodiumchloride. In your answer include: ● ● a labelled diagram of the apparatus used ● ● the observations made at the positive and the negative electrode. observation at positive electrode observation at negative electrode  Use the kinetic particle model to describe the arrangement and separation of the particles in solid sodium. arrangement separation  Sodium is a metal in Group I of the Periodic Table. Iron is a transition element. Give two ways in which the physical properties of iron differ from the physical properties of sodium.  The chemical equation for the reaction between iron(oxide and carbonmonoxide is shown. Fe2O3 + 3CO → 2Fe + 3CO2 Explain how this equation shows that carbonmonoxide has been oxidised. 
4. Electrochemistry  →  4.1. Electrolysis
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A student investigated the rate of decomposition of hydrogenperoxide, H2O2, in the presence of a catalyst by measuring the volume of oxygen released at 10 second intervals. 2H2O2 → 2H2O + O2 Complete the diagram to show a suitable method for collecting and measuring the volume of the oxygen. Label your diagram. hydrogen peroxide + catalyst  The graph shows how the volume of oxygen changes as the reaction proceeds. time / s volume of oxygen / cm3 Answer these questions using information from the graph. Describe how the rate of this reaction changes with time. Deduce the time taken to collect 60 cm3 of oxygen.  time = s The experiment is repeated without using a catalyst. Draw a line on the grid to show how the volume of oxygen changes with time when no catalyst is used. All other conditions stay the same. Describe what effect an increase in temperature has on the rate of this reaction. All other conditions stay the same. Identify which one of these elements is likely to act as a catalyst in chemical reactions. Draw a circle around the correct answer. C Mg Na Ni S Describe a test for oxygen. test result  
6. Chemical reactions  →  6.2. Rate of reaction
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This question is about metals and compounds of metals. Iron reacts with dilute hydrochloricacid to form an iron(salt and a gas which pops with a lighted splint. Complete the word equation for this reaction. iron + hydrochloric acid +  Identify two correct statements about iron. Tick two boxes. Iron forms an alloy called steel. The commonest ore of iron is called bauxite. Iron is usually extracted from its ore by electrolysis. Iron is oxidised by carbon in the blast furnace. Both oxygen and water are needed for iron to rust.  The table compares the reactions of four metals with warm water and with steam. metal reaction with warm water reaction with steam chromium no reaction slow reaction copper no reaction no reaction iron very slow reaction slow reaction magnesium very slow reaction rapid reaction Put the four metals in order of their reactivity. Put the least reactive metal first. least reactive most reactive  Crystals of cobalt(chloride, CoCl 2•6H2O, can be prepared by reacting excess cobalt(carbonate powder with dilute hydrochloricacid. Describe how to prepare a sample of pure dry cobalt(chloride crystals after the reaction is complete. In your answer describe how to: ● ● remove the excess cobalt(carbonate from the reaction mixture ● ● crystallise the cobalt(chloride ● ● dry the crystals. A few drops of water were added to a sample of solid anhydrous cobalt(chloride, CoCl 2. The equation for the reaction is shown. CoCl 2 + 6H2O CoCl 2•6H2O State the meaning of the symbol . State the colour change observed when water is added to anhydrous cobalt(chloride. from to 
9. Metals  →  9.4. Reactivity series
6. Chemical reactions  →  6.3. Reversible reactions and equilibrium
10. Chemistry of the environment  →  10.1. Water
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