Temperature and Thermal Energy Flashcards
What are molecules in a substance always in?
Molecules in a substance, like water, are always in motion.
What is the temperature of a substance?
The temperature of a substance is the average kinetic energy of all the molecules in that substance.
What is the thermal energy of a substance?
The thermal energy of a substance is the total kinetic energy contained in all the molecules of the substance.
What happens to thermal energy when more molecules are in motion?
The more molecules that are in motion in a substance, the more thermal energy it has.
What happens when energy is added to a substance?
The added energy generally increases the motion and average kinetic energy of the particles.
What occurs when thermal energy is added to a substance changing state?
The added energy is used to overcome attractions between the particles.
What happens to the temperature of a substance when more energy is added?
The temperature of a substance increases if more energy is added to it.
What is all matter made of?
All matter is made of particles.
What determines a substance’s state of matter?
The arrangement and movement of the particles determine a substance’s state of matter: solid, liquid, or gas.
