AP Chemistry Practice Exam MCQ Multiple Choice Questions with Answers on the last pages of the document |100% guaranteed|

A 0.5 mol sample of He(g) of Ne(g) are placed separately in two 10.0 L rigid containers at 25°C. Each container has a pinhole opening. Which of the gases, , will escape faster through the pinhole and why? (A) He(g) will escape faster because the (A) average speed than the Ne(g) atoms. (B) (B) Ne(g) will escape faster because its initial (C) pressure in the container is higher. (D) (C) Ne(g) will escape faster because the atoms have a higher average kinetic energy than the He(g) atoms. (D) Both gases will escape at the same rate because the atoms of both gases have2. The lattice energy of a salt is related to the energy required to separate the ions. For which of the following pairs of ions is the energy that is required to separate the ions largest? (Assume that the distance between the ions in each pair is equal to the sum of the ionic radii.)