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Stoichiometry & Chemical Reactions

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Stoichiometry & Chemical Reactions

Percentage Purity

The proportion of a sample that consists of the desired compound, expressed as a percentage of the total mass.

% purity = (mass pure / mass sample) × 100 Dimensionless
Stoichiometry & Chemical Reactions

Percentage Yield

The actual yield expressed as a percentage of the theoretical yield.

% yield = (actual / theoretical) × 100 Dimensionless
Stoichiometry & Chemical Reactions

Photochemical Reaction

A reaction initiated by the absorption of light, which promotes a molecule to an electronically excited state.

A + hν → A* nm
Stoichiometry & Chemical Reactions

Precipitate

An insoluble solid that separates from a solution as the result of a chemical reaction.

g
Stoichiometry & Chemical Reactions

Precipitation Reaction

A reaction in which two solutions combine to form an insoluble solid that separates from the mixture.

A⁺(aq) + B⁻(aq) → AB(s) Dimensionless
Stoichiometry & Chemical Reactions

Product

A substance formed as a result of a chemical reaction.

mol
Stoichiometry & Chemical Reactions

Pyrolysis

The thermal decomposition of a substance at high temperature in the absence of oxygen.

complex → simpler fragments (Δ, no O₂) °C