High School Physics : Enthalpy and Entropy
Study concepts, example questions & explanations for High School Physics
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Example Questions
Example Question #1 : Understanding Enthalpy
Enthalpy is a measure of __________.
total energy of a thermodynamic system
the conversion of energy to heat
total energy lost in heat transfer
how easily something changes temperature
total work done by a thermodynamic system
total energy of a thermodynamic system
Enthalpy, or 
Example Question #2 : Understanding Enthalpy
An ice cube melts into water. While it is melting, what is the temperature of the mixture doing?
The temperature fluctuates depending upon the point at which you measure it.
The temperature of the mixture steadily decreases while melting.
The ice part of the mixture is colder than the water part.
It remains constant while melting.
The temperature of the mixture steadily increases while melting.
It remains constant while melting.
When an object is changing forms (solid to liquid in this case), the temperature remains constant. All of the energy that would normally go towards changing the internal temperature of the object is going into the latent heat of fusion or enthalpy of fusion instead.
Example Question #621 : High School Physics
Entropy is a measure of __________.
change in heat
temperature
specific heat
energy within the system
disorder within the system
disorder within the system
Entropy is the measurement of disorder within a system, or how far it is from thermal equilibrium. Remember that everything in nature tends towards an equilibrium. The further from that equilibrium something is, the more "disordered" it is when compared to nature's preferred state.
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