500
There was a graph on your quiz as a study guide, this graph represented the changes of states that water goes through, this is what the y axis and the x axis were labeled as water moves through its changes from solid, to liquid to gas.
What is y = temperature, x = thermal energy (heat), basically the graph was showing that when there is an increase of temp. then the there is an increase of thermal energy (particle movement) which causes water to change from solid to liquid to gas?