Reactions and Enthalpy
Über den Vortrag
Der Vortrag „Reactions and Enthalpy“ von Jared Rovny, PhD ist Bestandteil des Kurses „Thermodynamics and Thermochemistry“.
Quiz zum Vortrag
A squishy ball is compressed from 8 L to half its original volume at atmospheric pressure. How much work is done on the ball? (1 atm ≈ 10⁵ Pa)
- 400 J
- 300 J
- 500 J
- 600 J
- 400 kJ
What is the interpretation of the term PV in the enthalpy relation H = U + PV?
- The amount of work done by the system to expand itself into volume V (from approximate 0 initial volume) at constant environmental pressure P.
- It is the product of two state variables pressure P and volume V of the system.
- The amount of heat added to the system in order to expand it from approximately 0 volume to its current volume V at constant pressure P.
- U is the internal energy of the system but U + PV is the total kinetic energy of the system.
- It is the maximum amount of work that can be extracted from the gas if all the kinetic energy of its molecules is turned into work.
Which of the following quantities is NOT a state variable?
- Heat added (Q)
- Enthalpy (H)
- Pressure (P)
- Volume (V)
- Entropy (S)
For constant pressure, what is the change in enthalpy of the system equal to?
- External heat energy added to the system
- Amount of work done on the system
- Change in volume
- Change in the total kinetic energy of the molecules of the system
- Change in entropy
Which of the following statements is FALSE?
- ΔH = Q + PΔV, at constant pressure P
- In a pressure-volume graph, regardless of which path the system takes to return to its original position, the internal energy remains the same.
- Added heat energy is NOT a state variable.
- The formula for enthalpy is H = U + PV.
- Enthalpy is a measure of the amount of external heat energy that is required to bring the system to its current state (plus a constant term related to the systems non-kinetic internal energy).
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Dozent des Vortrages Reactions and Enthalpy
Jared Rovny, PhD
Dr. Jared Rovny has been a Lecturer at Yale University in Connecticut, USA since 2013.
He obtained his PhD in Physics from Yale University in 2019. He was awarded the D. Allan Bromley Graduate Fellowship in Physics in 2019 and the Princeton Quantum Institute Postdoctoral Fellow in 2020.
Currently, he works with Yale's Center for Teaching and Learning at Yale University.
Due to his achievements, he earned the Yale College Prize Teaching Fellowship for his work in PHYS 171 (University Physics for the Life Sciences).
Within Lecturio, Dr. Rovny teaches courses on Physics.
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