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Photochemically produced oxidizing agents capable of causing damage to plants and animals.

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Heat of Condensation

The amount of heat that must be removed from one gram of a vapor at it's condensation point to condense the vapour with no change in temperature.

Henry's Law

The pressure of the gas above a solution is proportional to the concentration of the gas in the solution.

Heat of Solution

The amount of heat absorbed in the formation of solution that contains one mole of solute, the value is positive if heat is absorbed (endothermic) and negative if heat is released (exothermic).

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.

Octane Number

A number that indicates how smoothly a gasoline burns.

Degenerate

Of the same energy.

Meniscus

The shape assumed by the surface of a liquid in a cylindrical container.

Dumas Method

A method used to determine the molecular weights of volatile liquids.

Paramagnetism

Attraction toward a magnetic field, stronger than diamagnetism, but still weak compared to ferromagnetism.

Law of Definite Proportions (Law of Constant Composition)

The law stating that a pure substance will always have the same percent by weight. Different samples of a pure compound always contain the same elements in the same proportions by mass.