We discussed earlier some basic principles about the behavior of gases called the kinetic-molecular theory. Among other things, this theory suggests that gas molecules are in constant motion, and the average speed of the individual gas particles is dependent upon temperature – the higher the temperature, the faster the molecules move. It is not just gas particles that are in constant motion. The molecules and ions that make up liquids and solutions are also continually moving in nearly random directions. As a result, molecules and ions in a solution will collide with one another fairly frequently. As with gases, a temperature increase will produce an increase in the average particle speed.
Sue needed to make a simple syrup so she added water and sugar to a pot. She put the pot over a low heat and brought it to a simmer. Sue then removed the syrup from the heat and let it cool.
Were the solutions molecules colliding or moving away from each other.