Is "the heat of a substance is the measure of the average kinetic energy of the molecules of a system" true or flase

Which scenario is most similar to the type of collision that gas particles have according to kinetic molecular theory

What is the most common reason for matter changing its state?

An unknown insoluble substance displaced the water shown. it's mass is indicated on the triple beam balance. mass = a. 694 b. 693.5 c. 693.0 d.693.8