Thermodynamics: Chapter 6 * ability to do work * * energy used to take a mass and object with mass to move is called work * energy used ti cause the temp of an object to rise is called heat * energy from a battery * change chemical energy into heat or work * radiant energy comes form the sun and is earths primary energy source * thermal energy is energy associated with random motion of atoms and molecules * chemical energy is the energy stored within the bonds of chemical substances * nuclear energy is energy stored within collection nuetrons and protons * PE= ENERGY OF A OF POSITION * KE- ENERGY of of motion * energy released when bonds forms – bond energy (0-400 kj) * energy absorbed when bond breaks _bond energy (-i400 to -100) * when atoms in right distance 0 0, decrease in pe * completely p\apart and no affinity between the two * most important potential electrostatic energy in molecules is electros- associated with kollumbs law * si unit of energy is joule (J) 1 J- 1 kgm2/s2 * 1 cal in nutrition = 1 kcal in nutrition * 1 cal= 4.184 J * 1 cal = amount energy required to raise 1 g of water 1 C * ---- A food calorie is actually a kcal * the surroundings includes the universe * he system includes the molecules we want to study (here the hydrogen and oxygen molecules) * energy can enter or leave system as heat or as work done on a piston * Thermodynamics is the study of heat change in chemical reactions the system, is the specific part of the universe that is of interest in the study * the system is the specific part of the universe that is of interest in the study * energy used to move an object over some distance * work- force * the distance, distance is the distance over which the force is exerted * energy can also be transferred as heat *