What wavelength (in nanometers) corresponds to the transition of an electron in a hydrogen atom from n = 2 to n = 1

Compare and contrast physical changes with chemical changes.

What is the standard unit of measure for acceleration?

Asample of freon gas has a volume of 2.23 liters, a pressure of 4.85 kpa, and a temperature of -1.36°c. calculate the volume at a pressure of 1.38 kpa and a temperature of 5.5°c. (show work)