Energy, Heat, and Work Worksheet - Answer Key
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- What is Energy?
The capacity to do work or produce heat.
- What does the 1st Law of Thermodynamics State? What else is it known as?
This is also known as the Law of Conservation of Energy. This law states that energy isn’t created or destroyed - it is transferred from one form to another.
- What are the 2 primary types of energy? Give an example of each.
Potential ← Energy → Kinetic
(tank of gas) (pistons firing)
- What is heat? What is its symbol?
Energy transferred due to a temperature differential. Represented by “q”.
- What does exothermicity indicate? Endothermicity? How does that relate to potential energy graphs?
An exothermic reaction is one in which heat energy is released by the reaction. An endothermic reaction is one in which heat energy is absorbed in the process of the reaction.
In an exothermic reaction the products potential energy is lower than the reactants. In an endothermic reaction the reactants are lower in energy, thus energy is absorbed by the reaction.
- What is work? What is its symbol?
Force applied over a distance. Represented by “w”
- What is PV work? What is the equation?
PV work is work done by (an expansion) or on (a compression) a gas.
The formula for PV-work is w = -PΔV
- Indicate the signs of heat and work from system’s perspective for the following:
- Exothermic: – q
- Endothermic: + q
- Compression: +w
- Expansion: – w