15. (2 pts) A Lewis acid is: a. an electron pair acceptor b. an electron pair do

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15. (2 pts) A Lewis acid is: a. an electron pair acceptor b. an electron pair donor C. a proton acceptor d. a proton donor 16.HCl is a stronger acid than HF because: a. The HCl bond Is longer b. The HCI bond is shorter C. Cl is more electronegative d. The HCl bond Is stronger 17. H2SO4 is a stronger acid than H2SO4 because: a. It has more oxygens to strengthen the H-O bond b. It has more oxygens to weaken the H-O bond c. The extra oxygen donates electrons to the H-O bond d. The extra oxygen makes the H-S bond shorter 18. To shift the equilibrium in ammonia synthesis in their favor, engineers a. raised the pressure b. lowered the pressure c. raised the temperature d. lowered the temperature 19. At equilibrium, what is equal? a. concentrations of products and reactants b. rate constants ?or the forward and reverse reactions c. the rate of the forward and reverse reactions d. The partial pressures of the reactants and products 20. Chemists tried a century ago to solve world food problems by reducing what element ? a. hydrogen b. nitrogen c. oxygen d. phosphorus

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