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Saturday, 26 January 2019

2019 WAEC Chemistry Obj And Theory Expo - May/June

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1ai) A mixture contains two or more constituents which can easily be seperated by physical methods 1aii) magnesium trioxonitrate(v) = Mg(NO3)2 molar mass of Mg(NO3)2 =(1*24) + 2 (14*1 + 16*3) =24 + 2 (14 + 48) =24 + 28 + 96 = 148g/mol % of nitrogen = 2*24*100/148 % of nitrogen = 48*100/148 % of nitrogen = 4800/148 % of nitrogen = 32.43% 1aiii) i)calcium oxide (CaO) ii)calcium choride (CaCl2) 1bi) CnH2n+1OH 1bii) hydrolysation 1biii) i)displacement reaction ii)double decomposition reaction iii)decomposition reaction iv)catalytic reaction v)reversible reaction 1biv) i)endothermic heat change ii)exothermic heat change 1ci) i)methyl orange ii)phenolphthalein iii)litmus 1cii) NH4Cl+Ca(OH)2----->CaCl2+2NH3+2H2O 1ciii) it is collected by upward delivery 1civ) mass of gas = 1.58*22.4 = 35.392 vapour density = 35.392/1 relative molecular mass= V . D * 2 =35.392*2 relative molecular mass= 70.784 ================================== 5ai) i)carbon monoxide and hydrogen ii)carbon monoxide,carbon dioxide,hydrogen and nitrogen 5aii) i)colloids is an intermediate between true solution and a suspension ii)condensation is the process by which water vapour in the air is changed to liquid water 5bi) CaC03+2HCl----->CaCl2+H2O+CO2 5bii) i)it is used in fire extinguishers ii)it is used in the manufacturing of mineral water iii)carbon(iv)oxide is used as a coolant in nuclear reactors 5biii) i)Cr2O7^-2 =2Cr + C-2*7) = -2 2Cr - 14 = -2 2Cr = -2 + 14 2Cr/2 = 12/2 Cr = 6 ii)Cr2{SO4}3 2Cr + 3 (-2*1 + -2*4) = 0 2Cr + 3 (-2 - 8) = 0 2Cr + 3 (-10) = 0 2Cr - 30 = 0 2Cr/2 = 30/2 Cr = 15 5ci) vulcanization is a chemical process of converting netural rubber or related polymers into more durable materials through the addition of sulphur or other equivalent curatives or accelerators 5cii) Time Taken(t) for 6.35g of copper(ii)tetraoxosulphate solution Cu^2^+ + 2c ------->Cu Q = 2*63.5*95600 Q = 12255500 Q = 1t 12255500/10 = 10*t/10 t = 1225550/60 = 204258.3 5ciii) Latex ================================== 4ai) electrolytic cell is a cell that consist of a container of electrolyte with two electrodes connected to a suitable direct current supply 4aii) i)daniel cell ii)Leclanché cell 4aiii) i)copper ii)tin 4aiv) action of dilute acide on zinc 4av) Zn+2HCl------>ZnCl+H2 4bi) i)dinitrogen(i)oxide(N2O) ii)nitrogen(v)oxide(N2O5) iii)nitrogen(iv)oxide(NO2) 4bii) charle's law states that the volume of a fixed mass of gas varies directly with the absolute(kelvin)temperature provided the pressure remains constant. 4biii) P1 V1 = P2 V2 given that P1 = 900mmHg P2 = 750mmHg V1 = 300cm^3 V2 = ? V2 = P1V1/P2 V2 = 900*300/750 V2 = 270000/750 V2 = 360cm^3 4biv) % composition carbon = 12/(12*6) + (1*6) *100% = 12/72+6 *100 = 12/78 * 100% = 1200/78% %composition of carbon = 15.38%


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