If the boiling point of Selenium (Se) is , in what phase must the element be at ?

A large number of molecules begin moving very fast, rarely bumping into one another, and taking up the entire space available to them. As the temperature drops and the kinetic energy of the particles decreases, the particles move more slowly and run into each other more often. They eventually form a lattice structure, only slightly moving. What is this process called?

A phase diagram is used to show the phase that a compound will be in depending upon the environmental temperature and pressure.

Carbon dioxide will sublimate from a solid to a gas at room temperature. What would be necessary in order to cause solid carbon dioxide to melt?

A solution of water is at 0 degrees Celcius and 3atm. The pressure is constantly decreased until it was well below 0.000001atm. What will happen to the solution?

How does the boiling point of water at sea level compare to its boiling point at an elevation of 3000 feet?

Dry ice at room temperature undergoes the following reaction:

What is the name for the type of phase change where a solid changes directly to a gas (without any phase change in between)?

Liquid water at room temperature is cooled to -75O C

Which of the following descriptions applies to the process outlined above?

I: A physical change occurred

II: A chemical change occurred

III: There was a change in entropy