What are the positive human impacts on energy conservation?

Calculating Thermodynamic Changes and Conservation of Energy and Chemical Reactions?

• i am a little confuse with Calculating Thermodynamic Changes and Conservation of Energy and Chemical Reactions my books says Calculating Thermodynamic Changes If we represent a system’s internal energy by E, then the change in internal energy during any process is calculated as Efinal - Einitial Conservation of Energy and Chemical Reactions For many chemical reactions the only energy transfer processes are heating and doing work. If no other energy transfers (such as emitting light) take place, the law of conservation of energy for any system can be written as Delta E = q+w how do i know when to use Delta E = q+w and E final - E initial do i use Delta E = q+w for chemical energy and the other for everything else?

• Answer:

  Delta E = E final - E initial = q+w