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100608

# 100608 - What is the change in internal energy for the...

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Work y A force acting over a distance y Dependent on the path chosen, the sign of work is viewed from the point of view of the system.

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PV Work: Expansion
PV Work y Consider a gas at P gas = 6.0 atm and V = 400 mL in a cylinder with a moveable piston. The gas is allowed to expand to 1.5 atm at constant temperature. How much work is done?

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Heat y Heat- the transfer of energy between two objects, not a form of energy y Endothermic- energy flows from the surroundings to the system y Exothermic- energy flows from the system to the surroundings y Calorie- the heat requires to raise the temperature of one gram of water by one degree Celsius = 4.184 J
First Law of Thermodynamics y The energy of the universe is constant.

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Internal Energy y The gas in a piston is warmed and absorbs 655 J of heat. The volume of the container expands from 5.6 L to 9.0 L at 1 atm of pressure.

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