0620_w23_qp_32
A paper of Chemistry, 0620
Questions:
8
Year:
2023
Paper:
3
Variant:
2
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1
A list of compounds is shown. ammonia carbon dioxide carbon monoxide cobalt(chloride ethane ethene glucose methane potassium sulfate sodium phosphate sulfur dioxide Answer the following questions using only the compounds from the list. Each compound may be used once, more than once or not at all. Give the name of the compound that: is an unsaturated hydrocarbon leads to the deoxygenation of water in rivers is a gas which turns damp red litmus paper blue is the main constituent of natural gas is a product of photosynthesis is a compound of a transition element. 
11. Organic chemistry  →  11.3. Fuels
11. Organic chemistry  →  11.2. Naming organic compounds
11. Organic chemistry  →  11.1. Formulae, functional groups and terminology
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Petroleum is a mixture of hydrocarbons. Describe two characteristics of a mixture.  Fig. 2.1 shows a fractionating column for separating petroleum into different hydrocarbon fractions. lubricating oil bitumen refinery gas fraction gasoline A kerosene diesel oil fuel oil On Fig.2.1, draw an X inside the column to show where the hydrocarbon with the lowest volatility collects. Name the fraction labelled A in Fig.2.1. State the name of the fraction which has hydrocarbons with the longest chain length. State one use of the fuel oil fraction. 
11. Organic chemistry  →  11.3. Fuels
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Table3.1 shows the average concentrations, in ng / 1000 cm3, of air pollutants in four different years. Table 3.1 year concentration of air pollutant in ng / 1000 cm3 carbon monoxide hydrocarbons oxides of nitrogen particulates sulfur dioxide 2.5 12.0 19.6 28.0 30.0 2.0 13.5 21.8 30.1 21.7 1.8 14.8 18.5 27.5 23.8 1.6 16.0 22.7 26.2 25.0 Name the oxide pollutant that has the highest concentration in 2021. Name the pollutant that shows a continuous decrease in concentration from 2019 to 2022. Calculate the average mass, in ng, of particulates in a 250 cm3 sample of polluted air in 2019.  mass = ng State one adverse effect of particulates on health. Particulates are formed by the incomplete combustion of hydrocarbons. State the meaning of the term incomplete combustion. Oxides of nitrogen contribute to acid rain. Choose from the list the pH value for an acidic solution. Draw a circle around your chosen answer. pH 5 pH 7 pH 9 pH 13 Complete the sentence about removing oxides of nitrogen from car exhausts by choosing two words from the list. agent catalytic compound converter distillation filter oxidising pump The emission of oxides of nitrogen from car exhausts is reduced by using a . Oxides of nitrogen can be formed by the action of bacteria on nitrates. Name the aqueous solution and the metal used in the test for nitrate ions. aqueous solution metal  Nitrogendioxide decomposes when heated. Nitricoxide and oxygen are produced. Complete the symbol equation for this reaction. NO2 2NO +  State the meaning of the symbol . 
10. Chemistry of the environment  →  10.3. Air quality and climate
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Tin is a solid at room temperature. State two general properties of a solid.  Fig.4.1 shows the physical states of tin. solid tin liquid tin tin gas A B Name the changes of physical states A and B. A B  Describe solid and liquid tin in terms of the separation and motion of the particles. solid tin separation motion liquid tin separation motion  A sealed gas syringe contains 80 cm3 of carbondioxide gas. State how decreasing the temperature affects the volume of carbondioxide gas in the gas syringe when the pressure remains constant. 
1. States of matter  →  1.1. Solids, liquids and gases
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5
This question is about metals. Table5.1 shows some properties of some GroupI metals. Table 5.1 metal melting point in °C boiling point in °C atomic volume in cm3 / mol observations on reaction with water lithium 12.9 sodium 23.7 bubbles form rapidly but no flame potassium 45.4 bubbles form rapidly and flame seen rubidium explodes Use the information in Table5.1 to predict: the boiling point of sodium the atomic volume of rubidium the observations when lithium reacts with water the physical state of lithium at 1300 °C. Give a reason for your answer. physical state reason  Iron is extracted in a blast furnace by reduction of iron(oxide, Fe2O3, with carbonmonoxide. Fe2O3 + 3CO → 2Fe + 3CO2 Explain how this equation shows that iron(oxide is reduced. Choose the phrase which describes the meaning of (in iron(oxide. Tick (✓) one box. the number of oxygen atoms in iron(oxide the oxidation number of iron in iron(oxide the number of CO molecules which react with iron(oxide the number of electrons in one atom of iron  Calciumcarbonate is added to the blast furnace. The calciumcarbonate undergoes thermal decomposition. Complete the word equation for the thermal decomposition of calciumcarbonate. calcium carbonate → +  Stainless steel is an alloy. Choose the diagram, A, B, C or D, in Fig.5.1 that best shows the structure of an alloy. A B C D diagram Give one reason for using stainless steel instead of pure iron for cutlery. Table5.2 gives the observations when four different metals react with dilute hydrochloricacid. Table 5.2 metal observations iron bubbles form slowly mercury no bubbles seen strontium bubbles form very quickly tin bubbles form very slowly Put the four metals in order of their reactivity. Put the least reactive metal first. least reactive most reactive  
9. Metals  →  9.4. Reactivity series
9. Metals  →  9.6. Extraction of metals
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6
A student investigates the reaction of large pieces of magnesium with dilute hydrochloricacid at 20 °C. The magnesium is in excess. Fig.6.1 shows the volume of hydrogen gas released as the reaction proceeds. time / s volume of hydrogen gas / cm3 Deduce the volume of hydrogen gas released after 30 seconds.  volume of hydrogen = cm3 The student repeats the experiment using smaller pieces of magnesium. The mass of magnesium used remains the same. The magnesium is still in excess. All other conditions stay the same. Draw a line on the grid in Fig.6.1 to show the volume of hydrogen gas released when smaller pieces of magnesium are used. The student repeats the experiment at a higher temperature of 35 °C. All other conditions stay the same. Describe how the rate of reaction differs when a temperature of 35 °C is used. The student repeats the experiment using a lower concentration of acid. All other conditions stay the same. Describe how the rate of reaction differs when a lower concentration of acid is used. Hydrochloricacid reacts with lithiumhydroxide. Complete the word equation for this reaction. hydrochloric acid + lithium hydroxide → +  Choose from the list the word that best describes this reaction. Draw a circle around your chosen answer. addition decomposition neutralisation oxidation State the colour of a solution of thymolphthalein dissolved in aqueous sodiumhydroxide. 
6. Chemical reactions  →  6.2. Rate of reaction
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Fig.7.1 shows the displayed formula of fumaric acid. C H O H H C C O C O O H On Fig.7.1, draw a circle around one carboxylic acid functional group. Deduce the molecular formula of fumaricacid. Fumaricacid is a colourless compound. Describe the colour change when excess fumaricacid is added to aqueous bromine. from to ������������������������������������������������������������ Fumaricacid can be oxidised to produce a compound with the molecular formula C4H6O6. Complete Table7.1 to calculate the relative molecular mass of C4H6O6. Table 7.1 atom number of atoms relative atomic mass carbon 4 × 12 = 48 hydrogen oxygen  relative molecular mass = Ethanoicacid is a carboxylic acid. Complete the word equation for the reaction of ethanoicacid with sodiumcarbonate. ethanoic acid + sodium carbonate → + +  Ethanoicacid can be produced by the oxidation of ethanol. State one use of ethanol. Ethanol, C2H5OH, is an alcohol. Choose from the list the general formula for the alcohol homologous series. Draw a circle around your chosen answer. CnHnOH CnH2n+1OH CnH2n+2OH C2nH2nOH Ethanol can be manufactured by the addition of steam to ethene. State two conditions for this reaction.  
11. Organic chemistry  →  11.7. Carboxylic acids
11. Organic chemistry  →  11.2. Naming organic compounds
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Zincchloride is an ionic compound. Ionic compounds are good electrical conductors when molten or in aqueous solution. Describe one other physical property of ionic compounds. Complete Fig.8.1 to show: ● the electronic configuration of a chloride ion ● the charge on the ion. Cl  Deduce the number of protons and neutrons in the zinc ion shown. 67Zn2+ number of protons number of neutrons  Complete this sentence about positive ions. Positive ions are known as . Molten zincchloride is electrolysed using graphite electrodes. State the names of the products at each electrode and give the observations at the positive electrode. product at the negative electrode product at the positive electrode observations at the positive electrode  Graphite electrodes conduct electricity. State one other property that the electrode should have. Choose the correct statement about the structure and bonding in graphite. Tick (✓) one box. simple ionic simple covalent giant ionic giant covalent  State one use of graphite other than as an electrode. 
4. Electrochemistry  →  4.1. Electrolysis
2. Atoms, elements and compounds  →  2.4. Ions and ionic bonds
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