Core - Chemistry

Chapter 6

Thermochemistry

6.1 : Energy Basics

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 ...

37.2K viewsFree Sample

6.2 : First Law of Thermodynamics

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 ...

31.6K viewsFree Sample

6.3 : Internal Energy

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 ...

28.8K viewsFree Sample

6.4 : Quantifying Heat

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 ...

54.0K viewsFree Sample

6.5 : Quantifying Work

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 ...

19.1K viewsFree Sample

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 ...

34.9K viewsFree Sample

6.7 : Thermochemical Equations

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 ...

28.3K viewsFree Sample

6.8 : Constant Pressure Calorimetry

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 ...

84.7K viewsFree Sample

6.9 : Constant Volume Calorimetry

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 ...

26.9K viewsFree Sample

6.10 : Hess's Law

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 ...

44.6K viewsFree Sample

6.11 : Standard Enthalpy of Formation

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 ...

41.1K viewsFree Sample

6.12 : Enthalpies of Reaction

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 ...

31.5K viewsFree Sample

Copyright © 2025 MyJoVE Corporation. Todos os direitos reservados