1996-2009 KCSE CHEMISTRY ANSWERS 1.pdf

x-2, 8, 3, √; Y- 2, 8, 6, √; X2Y3 or Al2S3; mixture turns brown due to excess Br2; 0.15 moles CaCO3, excess mass = 5g; II requires little soap to lather, III has temporary hardness; sisal, cotton, wool, silk, jute, hemp, fur, hair; stronger than natural fibers; pass mixture through H2SO4 or NaOH; ammonia; II has sharp MP and BP; 2H2SO4, insoluble in water; circuit completed, bulb lights, brown substance formed; remove oxide coating; ORP; addition; CH3CH=CH2 + Cl2; hydrogen forms compounds by losing or gaining one electron; Al + 6H+ or 6OH-; wood ash is basic, reacts with aluminum; strong, not easily corroded; (C3H6O)n = 116, molecular formula = C3H12O2, percentage of carbon = 62.07; cool mixture to -196°C; alkaline, formula, heat of combustion; HC is exothermic; I - molten sulfur, II - superheated water; 2HCl + ZnCl, 2H2 + O2; hydrogen is lighter; NO3- : O = -6, N = +5, NO: O = 0, N = +2; reduction; chloride forms ions in water; gas with smell of rotten eggs; dissolve potassium sulfate, lead carbonate in nitric acid; enthalpy of neutralization; Ca(OH)2 forms white precipitate with CO2; structural formula, butan-1-ol, butan-2-ol; 2CH3CH2CH2OH + 2K; yield increases with temperature; 100g of Pa, 50g, 25g, 12.5g; mass number - 233, atomic number - 92; K and N in same group, L2O2, L has 7 electrons; M has bigger ionic radius; liquid P - concentrated sulfuric acid, solid Q - aluminum chloride; anhydrous calcium chloride; blue litmus turns red; NH4 + HCl, HCl + NH4; moles of HCl.