Which of these correctly describes what would happen to a system if 100 J of heat energy is added to it?


1. The potential energy of the system will increase and this will increase the attraction between its particles.


2. The strength of the bonds in system will increase and this will decrease the speed of its particles.


3. The kinetic energy of the system will increase and this will increase the speed of its particles.


4. The kinetic energy of the system will decrease and this will decrease the speed of its particles.