The Tea Act of 1773

For the second-order reaction below, the initial concentration of reactant A is 0.24 M. If the rate constant for the reaction is 1.5 x 10–2 M–1s–1, what is the concentration of A after 265 seconds?   2A → B + C rate = k[A]2   a. 0.12 M b. 0.19 M c. 0.95 M d. 4.0 M e. 5.2 M

Which of the following substances will have the strongest intermolecular forces? a. H2S b. CO c. CH3OH d. HBr e. Ar

Which drawing best represents hydrogen bonding in methylamine, CH3NH2? a. Drawing (1) b. Drawing (2) c. Drawing (3) d. Drawing (4) e. None of the above

When gaseous carbon monoxide and hydrogen are combined in a sealed vessel and heated they will eventually form an equilibrium mixture of reactants and products according to the balanced chemical equilibrium below. CO(g) + 3H2(g) → CH4(g) + H2O(g) In one such reaction 3 moles of one reactant were combined with 1 mole of the other reactant in a fixed volume vessel and heated to 1200 K.  Analysis of the reaction mixture at various times gave the results below.  Which component of the reaction mixture is represented by curve C? a. hydrogen b. carbon monoxide c. either methane or water d. either hydrogen or carbon monoxide e. not enough information to decide

Which drawing best represents hydrogen bonding in methylamine, CH3NH2? a. Drawing (1) b. Drawing (2) c. Drawing (3) d. Drawing (4) e. None of the above

What is the freezing point of an aqueous 1.36 m NaCl solution? (Kfp for water is 1.858°C/m.)  Assume no ion pairing occurs. a. 5.1°C b. 2.5°C c. –5.1°C d. 0.0°C e. –2.5°C

When gaseous carbon monoxide and hydrogen are combined in a sealed vessel and heated they will eventually form an equilibrium mixture of reactants and products according to the balanced chemical equilibrium below. CO(g) + 3H2(g) → CH4(g) + H2O(g) In one such reaction 3 moles of one reactant were combined with 1 mole of the other reactant in a fixed volume vessel and heated to 1200 K.  Analysis of the reaction mixture at various times gave the results below.  Which component of the reaction mixture is represented by curve C? a. hydrogen b. carbon monoxide c. either methane or water d. either hydrogen or carbon monoxide e. not enough information to decide

A 0.10 M solution of a weak monoprotic acid has a hydronium-ion concentration of 4.6 x 10–4 M. What is the acid-ionization constant, Ka, for this acid? a. 2.1 x 10–2 b. 3.2 x 10–3 c. 4.6 x 10–4 d. 2.1 x 10–6 e. 5.5 x 10–5

What is the weight percent of vitamin C in a solution made by dissolving 1.30 g of vitamin C, C6H8O6, in 55.0 g of water? a. 0.195% b.  0.242% c.  2.31% d.  2.56% e.  3.25%