6.4 ; internal energy

Question	Answer
define thermal energy	the total energy of an object due to the kinetic energy of its atoms and/or molecules depending on its mass
define temperature	a measure of the average kinetic energy of molecules
What does internal energy consist of?	1. the kinetic energy of atoms 2. the potential energy due to the intermolecular forces
What is internal energy?	the total energy in the kinetic and potential energy stores of all the particles in the substance
increasing the temperature =	= increases the internal energy
The strength of the forces of attraction between the particles of a substance explain why it is a solid, liquid, or gas. Give examples	• solid; strong forces of attraction • liquid; weaker forces of attraction • gas; insignificant forces of attraction
When a substance is heated:	• if its temperature rises, the kinetic energy of its particles increase • if it melts or boils, the potential energy of its particles increase

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