1) Which one of the following statements about 10.0 mL of 0.10 M HCl and 10.0 mL of 0.10 M CH₃COOH solutions is true?
A. Each solution will have the same electrical conductivity.
B. Each solution will react completely with 10.0 mL of 0.10 M NaOH solution.
C. Each solution will react at the same rate with 1.00 g of magnesium ribbon.
D. The concentration of H₃O⁺ ions will be greater in the CH₃COOH solution.

Solution

2) The activation energy for a particular uncatalysed reaction is 335 kJ mol^–1. The activation energy for the reaction when tungsten is used as a catalyst is 163 kJ mol^–1. When osmium is used as a catalyst, the activation energy is 197 kJ mol^–1. Which catalyst – osmium or tungsten – will cause the reaction to proceed at a faster rate? Justify your answer in terms of the chemical principles you have studied this year.

Solution