Which is the smallest atom in Group 7A?
Energy and Enthalpy Energy: ability to do work exchanged when particles come into contact lowest energy level is most stable electron arrangement and inter/intra molecular interactions Work transfer of force over distance Energy Changes always accompany chemical reactions ● Matter has Kinetic and Potential Energy ● Kinetic Energy energy of movement (thermal energy) ○ Temperature is a measure of this ● Potential Energy energy of position and state (bonds) ● Systems where energy is exchanged ○ Open energy and matter are exchanged ○ Closed only energy is exchanged ○ Isolated nothing is exchanged ● Internal Energy sum of Kinetic and Potential energy ○ A state function ○ State Function term only
