0620_w23_qp_33
A paper of Chemistry, 0620
Questions:
8
Year:
2023
Paper:
3
Variant:
3
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1
A list of substances is shown. ammonia calcium oxide carbon monoxide cobalt(chloride ethane ethanol ethene oxygen potassium oxide sodium sulfate sulfuric acid water Answer the following questions using only the substances from the list. Each substance may be used once, more than once or not at all. Give the name of the substance that: is a product of photosynthesis is a member of the alkene homologous series has an ion with a charge of 1– is used to remove sulfurdioxide in flue gas desulfurisation is the product formed in a hydrogen–oxygen fuel cell is used to test for water. 
10. Chemistry of the environment  →  10.1. Water
12. Experimental techniques and chemical analysis  →  12.5. Identification of ions and gases
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Hydrocarbons are compounds of carbon and hydrogen. State the meaning of the term compound. Fig. 2.1 shows a fractionating column for separating petroleum into different hydrocarbon fractions. lubricating oil bitumen refinery gas fraction gasoline naphtha kerosene B fuel oil On Fig.2.1, draw an X inside the column to show where the hydrocarbon with the highest boiling point collects. Name the fraction labelled B in Fig.2.1. State the name of the fraction which has hydrocarbons with the shortest chain length. State one use of the naphtha 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 5.3 22.0 15.6 19.0 20.0 4.1 13.5 14.8 20.1 18.2 5.8 14.8 22.7 23.5 16.2 2.6 18.0 10.9 26.2 14.0 Name the pollutant which has the highest concentration in 2019. Name the pollutant that shows a continuous decrease in concentration from 2019 to 2022. Calculate the average mass, in ng, of hydrocarbons in a 200 cm3 sample of polluted air in 2019.  mass = ng State one source of oxides of nitrogen in the air. Oxides of nitrogen contribute to acid rain. Give one other effect of oxides of nitrogen in the air. Unpolluted water has a neutral pH. Choose from the list the pH value of a neutral substance. Draw a circle around your chosen answer. pH 1 pH 6 pH 7 pH 14 Nitrogendioxide is an acidic oxide. Choose an oxide from the list which is also an acidic oxide. Tick (✓) one box. copper(oxide magnesium oxide phosphorus(oxide sodium oxide  Sulfurdioxide reacts with oxygen to produce sulfurtrioxide. Complete the symbol equation for this reaction. SO2 + 2SO3 State the meaning of the symbol . Sulfurtrioxide reacts with calciumoxide to produce calciumsulfate. Describe a test for sulfate ions. test observations  
10. Chemistry of the environment  →  10.3. Air quality and climate
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Nitrogen is a gas at room temperature. State two general properties of a gas.  Fig.4.1 shows the physical states of nitrogen. solid nitrogen liquid nitrogen nitrogen gas A B Name the changes of physical states A and B. A B  Describe solid nitrogen and nitrogen gas in terms of the arrangement and separation of the particles. solid nitrogen arrangement separation nitrogen gas arrangement separation  A sealed gas syringe contains 80 cm3 of nitrogen gas. State how increasing the pressure affects the volume of nitrogen gas in the gas syringe when the temperature remains constant. 
1. States of matter  →  1.1. Solids, liquids and gases
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This question is about metals. Table5.1 shows some properties of the Group I 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 bubbles form slowly but no flame sodium 23.7 potassium bubbles form very rapidly and flame seen rubidium 55.8 explodes Use the information in Table5.1 to predict: the melting point of rubidium ���������������������������������������������������������������������������������������� the atomic volume of potassium ����������������������������������������������������������������������������������� the observations when sodium reacts with water the physical state of sodium at 1300 °C. Give a reason for your answer. physical state reason  Iron is extracted in a blast furnace by reduction of iron(oxide. In the first step, carbon burns in air to form carbondioxide. State the percentage of oxygen in clean, dry air. In the second step, carbonmonoxide is produced by the reaction of carbon dioxide with carbon. CO2 + C → 2CO Choose the correct statement about this reaction. Tick (✓) one box. the carbon dioxide is oxidised and the carbon is reduced both carbon dioxide and carbon are oxidised the carbon dioxide is reduced and the carbon is oxidised both carbon dioxide and carbon are reduced  In the third step, iron(oxide is reduced by carbon monoxide. The reaction is exothermic. State the meaning of the term exothermic. Calciumcarbonate is added to the blast furnace. The calciumcarbonate breaks down as shown. high temperature calcium carbonate calcium oxide + carbon dioxide Name the type of chemical reaction that takes place. Complete this sentence about the calciumoxide that is produced in the blast furnace. Calciumoxide reacts with impurities in the iron ore to form . Table5.2 gives the observations when four different metals react with air. Table 5.2 metal observations cerium forms an oxide layer slowly without heating copper forms an oxide layer only when heated gold does not form an oxide layer even when heated rubidium forms an oxide layer quickly without heating Put the four metals in order of their reactivity. Put the least reactive metal first. least reactive most reactive  
9. Metals  →  9.6. Extraction of metals
9. Metals  →  9.4. Reactivity series
9. Metals  →  9.1. Properties of metals
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Hydrogenperoxide, H2O2, breaks down slowly at 40 °C to produce oxygen gas and water. 2H2O2 → 2H2O + O2 A student investigates the breakdown of hydrogenperoxide at 40 °C in the presence of a catalyst. Fig.6.1 shows the volume of oxygen gas released as the reaction proceeds. time / s volume of oxygen gas / cm3 Deduce the volume of oxygen gas released after 15seconds.  volume of oxygen = cm3 The student repeats the experiment at 20 °C. All other conditions stay the same. Draw a line on the grid in Fig.6.1 to show how the volume of oxygen changes when a temperature of 20 °C is used. The student repeats the experiment without a catalyst. All other conditions stay the same. Describe how the rate of reaction differs when no catalyst is used. The student repeats the experiment using a lower concentration of hydrogenperoxide. All other conditions stay the same. Describe how the rate of reaction differs when a lower concentration of hydrogenperoxide is used. Hydrogenperoxide can act as a reducing agent in the presence of an alkali. State the meaning of the term alkali. Give the formula of the ion that is present in all alkaline solutions. State the colour of methyl orange in an alkaline solution. Aqueous ammonia is an alkali. Complete the word equation for the reaction of aqueous ammonia with hydrochloricacid. ammonia + hydrochloric acid →  
6. Chemical reactions  →  6.2. Rate of reaction
7. Acids, bases and salts  →  7.1. The characteristic properties of acids and bases
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Ethanoicacid and methacrylicacid are both carboxylic acids. Complete the word equation for the reaction of ethanoicacid with calcium. ethanoic acid + calcium → +  Ethanoicacid can be reduced to ethanol. Name the homologous series that includes ethanol. Ethanol can be manufactured by fermentation. Describe two conditions needed for fermentation.  Fig.7.1 shows the displayed formula of methacrylicacid. O O C H H C H C H C H H On Fig.7.1, draw a circle around the functional group which reacts with aqueous bromine.  State the colour of aqueous bromine. Deduce the molecular formula of methacrylicacid. Methacrylicacid can be converted to methyl methacrylate. The molecular formula of methylmethacrylate is C5H8O2. Complete Table7.1 to calculate the relative molecular mass of methylmethacrylate. Table 7.1 atom number of atoms relative atomic mass carbon 5 × 12 = 60 hydrogen oxygen  relative molecular mass = Methylmethacrylate can be polymerised to produce a plastic. Describe two environmental problems caused by plastics.  Polyis a polymer. Draw the displayed formula of the monomer used to make poly.  
11. Organic chemistry  →  11.2. Naming organic compounds
11. Organic chemistry  →  11.7. Carboxylic acids
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Potassiumchloride is an ionic compound. Complete Fig.8.1 to show: ● the electronic configuration of a potassium ion ● the charge on the ion. K  Deduce the number of protons and neutrons in the chloride ion shown. 37Cl – number of protons number of neutrons  Molten potassiumchloride is electrolysed using graphite electrodes. Define the term electrolysis. 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 are inert. Name one other inert electrode. Graphite and diamond are two forms of carbon. Fig.8.2 shows the structure of diamond. Name the type of bonding in diamond. Use Fig.8.2 to explain why diamond is used in cutting tools. 
2. Atoms, elements and compounds  →  2.6. Giant covalent structures
4. Electrochemistry  →  4.1. Electrolysis
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