Which of the following acids is the weakest? The acid is followed by its Ka value.

Classify the following as Lewis acid or Lewis base. a) NBr3 [a] b) Cr3+ [b]

The first-order reaction A → B, has a rate constant of 8.00 s-1. How many seconds will it take for the concentration of A to decrease from 0.500 M to 0.200 M?

Determine the Ka for CH3NH3+ at 25°C. The Kb for CH3NH2 is 4.4 × 10-4.

Which of the following set of acids and conjugate bases would buffer most effectively at pH = 4.75?

A reaction mixture contains 0.139 M I2, 0.0392 M Cl2, and 0.222 M ICl for the reaction shown below: I2(g) + Cl2(g) ⇌ 2ICl(g)              KC = 9.04 at 298 K Show all your work and setup for credit. A) Calculate QC for the reaction. B) Is the reaction at equilibrium? C) If the reaction is not at equilibrium, will it proceed to form more reactants or more product?

Given the following data, determine the rate law for the following reaction. 2A + B + 2C → products Experiment [A] [B] [C] Rate (M/s) 1 0.273 0.763 0.400 3.0 2 0.819 0.763 0.400 9.0 3 0.273 1.526 0.400 12.0 4 0.273 0.763 0.800 6.0

Select the substance with the stronger dispersion force from each of the following pairs. 1) Cl2 or Br2 [a] 2) CO2 or CS2 [b] 3) SiCl4 or CF4 [c]

What is the boiling point of a solution prepared by dissolving 320.0 g of S8 (molar mass = 256.5 g/mol) in 1500.0 g of CCl4? (Kb = 5.05oC/m, boiling point of pure CCl4 = 76.7oC)

Consider the following 1.0 M aqueous solutions: A) HClO(aq) B) NaOH(aq) C) HNO3(aq) D) NH3(aq) Rank the aqueous solutions from the highest pH to the lowest pH. highest pH —–> [1] [2] [3] lowest pH —–> [4]