100% VERIFIED WAEC GCE CHEMISTRY ESSAY AND OBJ ANSWERS

100% Correct 2015 Waec Gce Chemistry Essay&Obj Answers CHEMISTRY OBJ: 1-10: AABABACACA 11-20: DABAAACDDB 21-30: ADDCCDCDCC 31-40: AACCADCDAB 41-50: ADDCCBAACD CHEMISTRY ESSAY: (1a) Hydrocarbon;This is a compound consisting of carbon and hydrogen only (1b) -High temperature -Presence of catalyst (1c) Oxidation is defined as the loss of electrons (1d) -The object is placed at the cathode -The electrolyte to be used should contain the electroplating metal (1e) i)Pent-2-ene ii)Butanoic acid (1f) Dalton's law of partial pressure states that the total pressure of a mixture of a gases equals to sum of individual pressure 1g) i)-They have improved mechanical properties -They are better in service ii)-Carbon -Iron 1h) i)Electrovalent bond ii)Mettalic bond iii)Electrovalent bond 1i) i)Isomers are compounds having the same molecular formular but different structural formular ii)Because it is inert and have a completely filled orbitals 1j) Galvanic cells are cells that convert electrical energy to chemical energy 2ai) -Number of neutrons:-20,Electron configuration:-1s^22s^22p^63s^23p^64s^1 -Number of neutrons:-10,Group:-7 -Number of neutrons:10,Electron configuration:-1s^22s^22p^5,Group:-0 (2aii) -X is alkali metals -Y is Halogens -Z is inert or noble gas (2aiii) -High melting point -Conduct electricity in molten form (2bi) This is because of decreasing atomic number (2bii) Relative atomic mass is the mass of an element in one atom of carbon-12 (2biii) V.D=R.A.M/2 V.D=32/2 =16 (3ai) CH3CH=CHCH# is alkene CH3COOCH3 is alkanoate CH3CH(OH)CH2CH3 is alkanol CH3(CH2)2CH3 is alkane (3aii) -But-2-ene -ethyl ethanoate -Butane -But-2-ol (3aiii) CH3(CH2)2C2H5Cl+HCl (3biii) -C2H5Cl+Cl2->C2H4Cl2+HCl -C2H4Cl2+Cl2->C2H3Cl3+HCl -C2H3Cl3+Cl2->C2H2Cl4+HCl -C2H2Cl4+Cl4+Cl2->C2HCl5+HCl -C2HCl5+Cl2->C2Cl6+HCl (3biv) Hexachloroethane 4ai) Allotropy is the existence of a compound in two or more physical states (4aii) -Diamond is crystalline bond -Graphite is covalent bond (4aiii) -Diamond is hard because it consist of fused carbon whereas graphite consists of weak intermolecular forces -This is because graphite consists of mobile electrons in the crystal lattice (4bi) -Excess of oxygen -Limited supply of air (4bii) C(s)+O2(g)->CO2(g) 2C(s)+O2(g)->2CO(g) (4biii) -Carbon(iv)Oxide -Carbon(ii)oxide (4ci) -Pb(NO3)2+2NaCl->2NaNO3+PbCl2 (4cii) -Molar mass of PbCl2=207+(35.5*2) =207+71=278g/mol 2g will produce 1g of PbCl2 1g will produce 1/2*5.56 278g will produce 1/2*5.56 =0.019 5ai) hydrolysis is the chemical breakdown of a compound due to reaction with water. More Answers Loading.....

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