0620_m22_qp_42
A paper of Chemistry, 0620
Questions:
6
Year:
2022
Paper:
4
Variant:
2

Login to start this paper & get access to powerful tools

1
This question is about the first 30 elements in the Periodic Table. Name the element which: is 78% of clean, dry air �������������������������������������������������������������������������������������������������������� has atoms with an electronic structure of 2,8,1 ������������������������������������������������������������������� is extracted from hematite ��������������������������������������������������������������������������������������������������� forms an oxide with a giant covalent structure �������������������������������������������������������������������� is the gas with the slowest rate of diffusion at room temperature ���������������������������������������������������������������������������������������������������������������������������������������������� has an anhydrous chloride which turns pink when water is added ���������������������������������������������������������������������������������������������������������������������������������������������� has aqueous ions which form a white precipitate when added to aqueous silver ions forms a blue hydroxide which dissolves in aqueous ammonia ������������������������������������������������������������������������������������������������������������������������������������������������ is added to molten iron to remove impurities in the steel making process ���������������������������������������������������������������������������������������������������������������������������������������������� is used to galvanise iron. ����������������������������������������������������������������������������������������������������� 
2
A student adds excess large pieces of magnesiumcarbonate, MgCO3, to dilute hydrochloricacid, HCl, and measures the volume of carbondioxide gas, CO2, given off. Add the missing state symbols to the chemical equation for the reaction. MgCO3 + 2HCl → MgCl 2+ H2O + CO2  Complete the dot-and-cross diagram to show the electron arrangement of the ions in magnesiumchloride. The inner shells have been drawn. Give the charges on the ions. Mg Cl Cl  Complete the dot-and-cross diagram to show the electron arrangement in a molecule of carbondioxide. Show outer shell electrons only. C O O  The graph shows how the volume of carbondioxide gas changes with time. volume of carbon dioxide gas time Describe how the graph shows that the rate of this reaction decreases as time increases. Explain, in terms of particles, why the rate of this reaction decreases as time increases. The student repeats the experiment using powdered MgCO3 instead of large pieces. All other conditions stay the same. On the grid, draw the line expected when powdered MgCO3 is used instead of large pieces. Determine the volume of CO2 gas given off when excess MgCO3 is added to 25.0 cm3 of 0.400 mol / dm3 HCl at room temperature and pressure. MgCO3 + 2HCl → MgCl 2 + H2O + CO2 Use the following steps. ● Calculate the number of moles of HCl in 25.0 cm3 of 0.400 mol / dm3 of acid.  mol ● Determine the number of moles of CO2 gas given off.  mol ● Calculate the volume of CO2 gas given off in cm3.  cm3  
3
Nitrogendioxide, NO2, is an atmospheric pollutant and is formed in car engines. Explain how nitrogendioxide is formed in car engines. Nitrogendioxide causes respiratory problems. State one other adverse effect of nitrogendioxide. Nitrogendioxide emissions can be reduced by adding an aqueous solution of urea, (NH2)2CO, to car exhaust gases. The heat of the exhaust gases breaks down the urea into simpler substances. Name the type of reaction which occurs when a substance is heated and breaks down into simpler substances. One molecule of urea breaks down to form one molecule of ammonia and one other molecule. Complete the chemical equation to show the formula of the other molecule formed in this reaction. (NH2)2CO → NH3 +  State the test for ammonia. test observations  The ammonia formed reacts with nitrogendioxide to form nitrogen and water. Balance the equation for this reaction. NO2 + NH3 → N2 + 12H2O State how the equation shows that the nitrogen in nitrogendioxide is reduced. This reaction is a redox reaction. State the meaning of the term redox. 135moles of urea, (NH2)2CO, is stored in the tank of a car. Calculate the mass, in kg, of the stored (NH2)2CO.  mass of (NH2)2CO = kg  Another oxide of nitrogen formed in car engines is nitrogenmonoxide, NO. A catalytic converter removes NO by reacting it with a gas formed by incomplete combustion of the fuel. Two non‑toxic gases are formed. Name the gas formed by incomplete combustion of the fuel. Name the two non‑toxic gases formed. and ���������������������������������������������������������������� 
4
5
6
The names of four esters are listed. methyl propanoate ethyl propanoate propyl propanoate butyl propanoate Esters are a family of organic compounds with similar chemical properties. They can be represented by the formula CnH2nO2. State the name given to a family of organic compounds with similar chemical properties. Explain why members of a family of organic compounds have similar chemical properties. State the name given to a formula such as CnH2nO2. Determine the value of ‘n’ in butyl propanoate. All four of the esters in the list are liquids at room temperature. Name the technique used to separate ethyl propanoate from a mixture of the four esters. All four esters can be made by reacting different alcohols with the same substance. Name this substance and draw its structure. Show all of the atoms and all of the bonds. name structure  Name the alcohol used to make methyl propanoate. Other esters, not in the list, have the same molecular formula as propyl propanoate, but different structures. State the term used to describe substances with the same molecular formula but different structures. Name two esters with the same molecular formula as propyl propanoate.  Polyesters can be made from the two different molecules shown. C O H and O H O C O O H H O Complete the diagram to show a section of the polyester made from these two molecules. Include all of the atoms and all of the bonds in the linkages.  Name the type of polymerisation that takes place when this polymer forms. Name a polyester.