Run the \"States of Matter\" simulation from http://phet.colorado.edu/en/simulat

Question

Run the "States of Matter" simulation from http://phet.colorado.edu/en/simulation/legacy/states-of-matter Choose the "Solid, Liquid, Gas" tab. It should display an approximately square "crystal" of solid neon. Note that the initial temperature is 13K. Experiment with the simulation until you see everything that is going on. Then click the "Reset All" button to return to the initial state of solid neon at 13K.

Slowly increase the temperature (using the "Heat | Cool" slider control) to 26K. As you do this, which of the statements below best describe the effect of increasing the temperature?

a. The individual atoms stop moving

b. The average size of the crystal decreases

c. The crystal begins to rotate, faster as the temperature increases

d. The crystal completely melts as soon as the temperature starts to change.

e. The average size of the crystal increases

Explanation / Answer

As temperature is increased, there is a corresponding increase in the vigor of translational and rotation motions of all molecules. when the temperature rises. Heating a solution of a solid makes it easier for the particles of solid to move between the solution and the solid phase. The Second Law predicts that they will shift to the more disordered, more highly dispersed, and therefore, more probably solution state.

so option C and D describe the effect of increasing the temperature.

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