During a phase change like melting ice, the temperature of the ice-water mixture

Potential energy resulting from the attraction of particles

When a liquid sample is taken from sea level to a higher elevation, what happens to the external (atmospheric) pressure on the liquid and the boiling point of the liquid?

Which one of the following changes would cause the pressure of a gas to double assuming volume and number of moles is held constant? 

Which of the following is not a standard condition (STP) for gas measurements?

In which of the following processes does the energy of the water decrease?

A helium balloon initially at room temperature is dunked into a bucket of liquid nitrogen (T=77K).  Which of the following will occur? 

Which of the following pairs of gases would diffuse at essentially the same rate?

Moving water from the mile high city, Denver Colorado, to Sterling Illinois will have what effect on its boiling point?

Which of the following does not affect the rate of evaporation of a liquid?