chemistry notes

chemistry notes - Energy Changes ● Study of energy and...

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Energy Changes Study of energy and energy changes, known as thermodynamics. Chemistists are more interested in a branch of thermodynamics called thermochemistry The study of energy changes that involve physical and chemical changes. Energy is the force, strength and the capacity, to do things and to get things done. Energy is the ability to do work, generate heat or to create electricity. Defined as a exerted on an abject over some distance Units are Nm or Joules ( J ) Physical and chemical transformations involve energy changes. First Law Of Thermodynamics :- says that the total energy of the universe is constant ΔE Universe = 0 Energy can be neither created or destroyed, while energy is converted in a chemical process, total energy remains constant. Law says that if heat leaves the system, same amount of heat must enter the surrounding. ΔE Universe = ΔE system + ΔE Surroundings = 0 Or → ΔE system = - ΔE Surroundings Kinetic Energy, E k
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