0620_m23_qp_42
A paper of Chemistry, 0620
Questions:
5
Year:
2023
Paper:
4
Variant:
2
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1
This question is about gases found in clean, dry air and gases found in polluted air. Name one gas found in clean, dry air which contributes to global warming. State the percentage of nitrogen in clean, dry air. Name the substance used to remove sulfurdioxide in flue gas desulfurisation. Nitrogendioxide, NO2, is formed in car engines. Name the equipment in a car exhaust used to remove the NO2 formed in car engines. All gases diffuse. Choose from the list of formulae the gas which diffuses most quickly. Draw a circle around your answer. CO CO2 CH4 NO2 SO2  Explain your answer to . State one adverse effect of carbon monoxide on human health. Carbon dioxide, CO2, is a reactant in photosynthesis. Name the two products of photosynthesis. and ������������������������������������������������������������������� Complete the dot-and-cross diagram in Fig.1.1 for a molecule of CO2. Show outer shell electrons only. C O O  
10. Chemistry of the environment  →  10.3. Air quality and climate
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2
Lithium, sodium and potassium are GroupI elements. Name the type of bonding in these elements. Sodium reacts with cold water to form hydrogen gas and a solution of a strong alkali. State the test for hydrogen gas. test positive result  Suggest the pH of a solution of a strong alkali.  pH = Name a substance which can be used to confirm the pH of a solution of a strong alkali. Write the symbol equation for the reaction between sodium and cold water. Include state symbols. Lithium has two naturally occurring types of atoms, 6Li and 7Li. State the name given to atoms of the same element with different nucleon numbers. Complete Table2.1 to show the number of protons, neutrons and electrons in the atom and ion of lithium shown. Table2.1 6Li 7Li+ protons neutrons electrons  Table 2.2 shows the relative abundance of the two naturally occurring atoms of lithium. Table 2.2 atom 6Li 7Li relative abundance 10% 90% Calculate the relative atomic mass of lithium to one decimal place.  relative atomic mass = Potassiumoxide, K2O, is an ionic compound. Complete Fig.2.1 to show the electronic configurations of the ions in potassiumoxide. Show the charges on the ions. K O K  
12. Experimental techniques and chemical analysis  →  12.5. Identification of ions and gases
8. The Periodic Table  →  8.1. Arrangement of elements
8. The Periodic Table  →  8.2. Group I properties
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3
The Haber process is used to manufacture ammonia. State the main source of each gas used in the Haber process. nitrogen hydrogen  The equation for the Haber process is shown. N2+ 3H22NH3∆H = –92 kJ / mol The reaction is reversible. The forward reaction is exothermic. State what is meant by the symbol ∆H. ∆H for the forward reaction is –92 kJ / mol. State why this value shows that the forward reaction is exothermic. State the typical conditions and name the catalyst used in the Haber process. temperature °C pressure kPa catalyst  Complete Table3.1 to show the effect, if any, when the typical conditions in the Haber process are changed. Use only the words increases, decreases or no change. Table 3.1 change to typical conditions effect on the rate of the forward reaction effect on the concentration of NH3at equilibrium temperature increases increases pressure decreases no catalyst decreases  Explain in terms of collision theory why increasing the temperature increases the rate of the reaction. Ammonia reacts with an acid to form ammoniumsulfate, (NH4)2SO4. State the formula of the acid used. State one use of ammonium sulfate. Calculate the percentage composition by mass of nitrogen in (NH4)2SO4.  percentage of nitrogen = % 
6. Chemical reactions  →  6.3. Reversible reactions and equilibrium
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4
Copper is element 29 in the Periodic Table. Brass contains copper. Name the other metal in brass. State the term given to a mixture of a metal with another element. Copper can be stretched into wires. Copper wires conduct electricity. Name the property of metals which means that they can be stretched into wires. Name the particles responsible for the conduction of electricity in solid copper. Copper is a transition element. Some physical and chemical properties of transition elements are shown. physical properties: ● high density ● high strength chemical properties: ● form coloured compounds ● have ions with variable oxidation numbers State one other physical property of transition elements. State one other chemical property of transition elements. Hydrated copper(sulfate is a coloured compound. It exists as hydrated crystals which contain water molecules. State the term given to water molecules present in hydrated crystals. State the colour of hydrated copper(sulfate crystals. Write the formula of hydrated copper(sulfate. Copper(oxide is formed when copper(nitrate, Cu(NO3)2, is heated. 2Cu(NO3)2→ 2CuO+ 4NO2+ O2State the class of oxide to which copper(oxide belongs. State the meaning of the Roman numeral (in the name copper(oxide. 0.0200moles of Cu(NO3)2 is heated. Calculate the mass of 0.0200moles of Cu(NO3)2.  mass = g Calculate the total volume of gas, in dm3 at r.t.p., produced when 0.0200 moles of Cu(NO3)2 is heated.  volume = dm3 Powdered aluminium reduces copper(oxide. Write the symbol equation for this reaction. 
4. Electrochemistry  →  4.1. Electrolysis
9. Metals  →  9.4. Reactivity series
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5
Propane, propene, propan-1-ol and propanoicacid are members of different homologous series. Molecules of these substances contain three carbon atoms. Explain why members of a homologous series have similar chemical properties. Name the homologous series to which propanoicacid belongs. State the general formula of the homologous series to which propanoicacid belongs. Propan-1-ol has an unbranched isomer. ● Name this isomer. ● Draw the displayed formula of this isomer.  Propane and propene can be manufactured by heating decane, C10H22, in the presence of a catalyst. One other product is formed. Complete the equation for this reaction. C10H22 → + +  Name this manufacturing process. Propene forms a polymer named poly. Draw the displayed formula of a section of polyshowing three repeat units.  State the type of polymerisation that occurs when propene forms poly. Propanoicacid reacts with aqueous sodiumcarbonate to form a salt. Suggest the name of the salt formed. Suggest the formula of the anion in this salt. Propanoicacid forms an ester when it reacts with ethanol in the presence of a catalyst. Suggest a suitable catalyst. Name the ester formed. Draw the displayed formula of this ester.  
11. Organic chemistry  →  11.5. Alkenes
11. Organic chemistry  →  11.2. Naming organic compounds
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