1. A 250. ml sample of oxygen is collected over water at 25°C and 760.0 torr pressure. What is the pressure of the dry gas? (vapor pressure of water at 25°C=23.8 torr).

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.

Which of the following words describe the reality that the universe looks the same from various perspective