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Chem31 Chapt. 9, pt. I: Energy, Enthalpy & Ideal Gases by Mind Map: Chem31 Chapt. 9, pt. I: Energy, Enthalpy & Ideal Gases
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Chem31 Chapt. 9, pt. I: Energy, Enthalpy & Ideal Gases

Energy in Daily Life

Chemical Sources

Non-chemical Sources

Definitions & Laws of Energy

Energy: capacity to do work or produce heat

Law of Conservation of Energy

Classifications of Energy

Potential Energy

Kinetic Energy E1

Interconversion Between Kinetic & Potential Energy E2

Heat & Work

Difference between heat & temperature

Work: Force acting over a distance

Two ways to transfer nrg: heat & work

Proportion of heat & work depends on process

Chemical Energy

Combustion of methane: energy as a product E3

Universe is divided into two parts

Heat and chemical reactions

Relative energy of reactants & products

Thermodynamics: study of energy and its interconversions

1st Law of Thermo: The energy of the universe is constant

The internal energy (E) of a system is the sum of the kinetic and potential energy of all of its particles

SIGN CONVENTIONS: from system's point of view F3

Pressure-volume work (PV) of a gas in a cylinder F4

Enthalpy

Definition: H= E +PV

Process at constant pressure where only PV work allowed (w=-PΔV)

For a chemical reaction, the enthalpy change, is ΔH=Hproducts-Hreactants

Thermodynamics of Ideal Gases T2

Ideal Gas Law: PV=nRT

Kinetic energy of an ideal gas: KE=3/2RT

Heating an ideal gas at constant volume

Heating an ideal gas at constant pressure

Heating a polyatomic gas T1

State Functions

Property that depends on the present state of system, not on its past or future

Change in a state function in going from one state to another is independent of the pathway it takes

Energy is a state function, heat and work are not

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