I. Single choice (2 points per question, 20%) 1. Cases AS >0; AH Mg > N > K B. K> Na > Mg? > Mg C. K > Mg > Na > Mg2+ D.K> Na > Mg > Mg? 4. The first law of thermodynamics, AU=Q+W, can only be applied to A. phase transition B. physical change. C. chemical change D.any system 5. Which one of the following is a pair of conjugate acid and base? A. H.CO;-CO, B. HPOP-PO. C. H PO.-HPO? NH, NH,.H2O D. 6. In a molecule of XeF., the arrangement of electron pairs would be described as A. octahedral B. square planar C. square pyramidal D. tetrahedral 7. The units of the rate constant for a second order reaction could be A. Misl B. M C.M ' D.' (e) Ms! 8.Given the following reactions of ideal gas: (i 2H2O(g)=2H2(g) +O2(g) :ii CO2(g)=CO(g)+1/202(g) Then we have the reaction (iii) CO(g)+H2O(g)=CO2(g) +H2(g) A K = K/K K = KK B K" - K/K DK_KK 9. Which one has the highest boiling point? A CHA B CCI, C CH3CI D H Br 10. Which element has the highest electronegativity ? APBS CN DF