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The enthalpy change for a reaction is the same whether it occurs in one step or a series of steps.

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DP number

The degree of polymerization, the average number of monomer units per polymer unit.

Metallic Bonding

Bonding within metals due to the electrical attraction of positively charges metal ions for mobile electrons that belong to the crystal as a whole.

Group

A vertical column in the periodic table, also called a family.

Vapor

A gas formed by boiling or evaporating a liquid.

Halogens

Group VIIA elements: F, Cl, Br, I

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.

Explosive limits

The range of concentrations over which a flammable vapour mixed with proper ratios of air will ignite or explode if a source of ignitions is provided.

Rate-law Expression

Equation relating the rate of a reaction to the concentrations of the reactants and the specific rate of the constant.

Functional Group

A group of atoms that represents a potential reaction site in an organic compound.

Ioniztion

The breaking up of a compound into separate ions.