FOR LSPU-LBC BSFT II-A QUANTITATIVE CHEM 2015

A. DEFINE THE FOLOWING TERMS: MOLARITY, NORMALITY, MOLE FRACTION, DILUTION, SOLUBILITY, DYNAMIC EQUILIBRIUM, SOLUTIONS,MOLALITY, CONCENTRATIONS, EXOTHERMIC AND ENDOTHERMIC CHANGES, PERCENT BY VOLUME, BY MASS AND BY MASS AND VOLUME, CONCENTRATED, DILUTED, SUPERSATURATED, AND UNSATURATED B. PRACTICE HOW TO DETERMINE OXIDATION NUMBER OF A COMPOUND OR POLYATOMIC IONS/ RADICALS C. rEVIEW HALF REACTION AS OXIDATION AND REDUCTION D. EXERCISE THESE AT HOME, BECAUSE SIMILAR QUESTIONS MIGHT BE GIVEN IN THE EXAM. VI. 1. Balance the following REDOX equations using half-reaction method: Choose only TWO (1 acidic and 1 basic medium) from letter A to D. (10 points each) A. S2O3 2- + Cl2 → SO4 2- + Cl - (acidic) B. Cl - + NO3 - → ClO3 - + NO (basic) C. Fe 2+ + MnO4 - → Fe 3+ Mn 2+ (acidic) D. Cl2 + Cr (OH)3 → Cl - + CrO4 2- (basic) 2. Balance the equation by adding electrons either to the reactant side or product side.(10 points each) E. MnO4 - → Mn 2+ (acidic) F. Cr (OH)3 → CrO4 2- (basic)