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The study of the energy transfers accompanying physical and chemical processes.

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Adsorption

Adhesion of a species onto the surfaces of particles.

Formula Weight

The mass of one formula unit of a substance in atomic mass units.

 

Condensed States

The solid and liquid states.

First Law of Thermodynamics

The total amount of energy in the universe is constant (also known as the Law of Conservation of Energy) energy is neither created nor destroyed in ordinary chemical reactions and physical changes.

Mother Nuclide

Nuclide that undergoes nuclear decay.

Activation Energy

Amount of energy that must be absorbed by reactants in their ground states to reach the transition state so that a reaction can occur. In other words, activation energy is the minimum energy required for a chemical reaction to occur.

Periodicity

Regular periodic variations of properties of elements with atomic number (and position in the periodic table).

Combination Reaction

Reaction in which two substances (elements or compounds) combine to form one compound.

Colligative Properties

Physical properties of solutions that depend upon the number but not the kind of solute particles present.

Dispersing Medium

The solvent-like phase in a colloid.