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Core - Chemistry

    Chapter 6

    Thermochemistry

    6.1 : Energy Basics02:27

    6.1 : Energy Basics

    Chemical reactions, such as those that occur when you light a match, involve changes in energy as well as matter. Chemical changes and their accompanying ...

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    6.2 : First Law of Thermodynamics02:16

    6.2 : First Law of Thermodynamics

    Energy Conservation Energy can be converted from one form into another, but all of the energy present before a change occurs always exists in some form ...

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    6.3 : Internal Energy02:00

    6.3 : Internal Energy

    The total of all possible kinds of energy present in a substance is called the internal energy (U), sometimes symbolized as E. Suppose a system with ...

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    6.4 : Quantifying Heat02:46

    6.4 : Quantifying Heat

    Thermal Energy  Microscopically, thermal energy is the kinetic energy associated with the random motion of atoms and molecules. Temperature is a ...

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    6.5 : Quantifying Work02:30

    6.5 : Quantifying Work

    As a system undergoes a change, its internal energy can change, and energy can be transferred from the system to the surroundings, or from the ...

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    6.6 : Enthalpy02:59

    6.6 : Enthalpy

    Chemists ordinarily use a property known as enthalpy (H) to describe the thermodynamics of chemical and physical processes. Enthalpy is defined as the sum ...

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    6.7 : Thermochemical Equations02:55

    6.7 : Thermochemical Equations

    For a chemical reaction (the system) carried out at constant pressure – with the only work done caused by expansion or contraction – the ...

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    6.8 : Constant Pressure Calorimetry03:02

    6.8 : Constant Pressure Calorimetry

    Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a ...

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    6.9 : Constant Volume Calorimetry02:41

    6.9 : Constant Volume Calorimetry

    Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at constant ...

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    6.10 : Hess's Law03:40

    6.10 : Hess's Law

    There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally ...

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    6.11 : Standard Enthalpy of Formation02:37

    6.11 : Standard Enthalpy of Formation

    Enthalpy changes are typically tabulated for reactions in which both the reactants and products are at the same conditions. A standard state is a commonly ...

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    6.12 : Enthalpies of Reaction03:33

    6.12 : Enthalpies of Reaction

    Hess’s law can be used to determine the enthalpy change of any reaction if the corresponding enthalpies of formation of the reactants and products ...

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