CHEG 2111 Lecture 2: Chapter 1 and 2 Notes

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28 Jan 2019

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Work measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement dw = fdl = -pd(al) = -pdv. + work = work done to/on the system. Work = work done by the system. P delta v only if pressure is constant. Kinetic energy : energy gained from a force f exerted on a mass causing a change of velocity from u1 to u2. Potential energy : energy gained from position (spring or gravity) System : a body on which the attention is focused. Closed : no mass flow through the system. Isolated : no mass or energy flows through the system ex. type of system in a pizza delivery bag : isolated. Surroundings : anything else that surrounds the system. Etotal = e k + e p + = constant.

Related Questions

General Chemistry I

PV Work

The joule (J) is a unit of energy. Recall that energy may be converted between many different forms such as mechanical energy, thermal energy (heat), chemical energy, electrical energy, and light.

The mechanical energy produced by a system is called work. When work is accomplished through the changing volume of a gas, it is called PV work and is given by the formula w=âPÎV, where w is the work, P is the external pressure, and ÎV is the change in volume. If the volume change and pressure are in liters and atmospheres respectively, then the work will have units of liter-atmospheres, which can be converted to joules using the conversion factor 1 Lâ atm=101.3 J.

Work can also be expressed as force multiplied by distance: w=FÃd, where w is the work in joules, F is the force in newtons, and d is the distance in meters. Note that 1 Nâ m=1 J.

Part A

A piston has an external pressure of 9.00 atm. How much work has been done in joules if the cylinder goes from a volume of 0.160 liters to 0.550 liters?

Express your answer with the appropriate units.

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w =

CHEG 2111 Lecture 2: Chapter 1 and 2 Notes

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