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WAEC 2017 CHEMISTRY OBJ & ESSAY ANSWER / SUBSCRIPTION



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  • Chem
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    ===Tuesday, 18th April, 2017Chemistry 2 (Essay) 2.00pm - 4.00pmChemistry 1 (Objective) 4.00pm - 5.00pm============================THEORY1ai)an acid base indicator is a weak acid or weak base that exhibits a colour change as theconcentration of hydrogen (H^+) or hydroxide (H^-) ions changes in an aqueous solution1aii)methyl-orange1b)i)oxidizing agentii)mixed anhydride1c)enthalpy of combustion is the heat evolved when one mole of a substance is completely burns in oxygen gas under standard conditions1cii)enthapy of combustion is always negetive sinceit involvsa rise in temperature and heat of reactants is greater than theheat of products1d)primary cell is a cell that cannot be re charged while secondary cell is a cell that canbe recharged1dii)primary cell -- daniell cellsecondary cell -- lead accumulator1e)mole is the unit of measurement in the International System of Units (SI) for amount of substance. The unit is defined as theamount of a chemical substance which contains as many representative particles, e.g., atoms, molecules, ions, electrons, or photons, as there are atoms in 12 grams of carbon-12 (12C), the isotope ofcarbon with relative atomic mass1f)n= V=40cm^3c= 0.40moldm^3n=cv/10000.40*40/1000 = 0.016mol1g)i) Platinumii) Carbon1h)i) Hydrogen bondsii) Vander waals forces1i) Water(H2O) and Carbonmonoxide (Co)1j) 1s^2 2s^2 2p^6 3s^2 3p^6 3d^3 4s^2==================3)3b)in other words the oil is stainedred. This is a aspecifit test for fatsif suden(iii) is added to fats a distinct red colouration is observed3c)Given 2502+02+2H20--->2H2SO41mole produce 2mole1.3mole produce 3molemoles of H2SO4=3molemolarmass of H2SO4=(1+2)+32+(4*16)=2+32+64=98gmol-^1mole=mass/molar massmass and H2SO4=Mole*molar mass=3*98=294g3di)DH23ai)Thermal cracking3aii)C4H83aiii)(I) H H. H| | |H-C-C-C=C| | ||H H H Hand(II) H H| |H-C-C=C-C-H| | | |H H H H3aiv)I-normal buteneII -But-2-eneNi3av)C4H8 +H2 -------> C4H10250c3b)method- rub the fat on a blank white paper- pour Sudan(III) dye over the paper-wash the paper under tapObservation- rubbing the fat on the paper produces a translucent color-pouring sudan(III) will stain the blot redConclusion- fat is present because sudan(III) can stain fat red

    Posted by OGA EASYNET on 18.04 17:30 Reply


  • great achievement

    Posted by sam on 18.04 17:33 Reply




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