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A number that indicates how smoothly a gasoline burns.

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Chain Reaction

A reaction that, once initiated, sustains itself and expands. This is a reaction in which reactive species, such as radicals, are produced in more than one step. These reactive species, radicals, propagate the chain reaction.

 

Dilution

Process of reducing the concentration of a solute in solution, usually simply by mixing with more solvent.

Alpha (a) Particle

Helium ion with 2+ charge, an assembly of two protons and two neutrons.

Saccharide

An organic compound containing a sugar or sugars.

Gem-dimethyl group

Two methyl groups of the same carbon atom.

Ozone

We breathe 24 hours a day, 7 days a week, consuming about 25 kg of air every day. It turns out that we practically predetermine our health by the air we breathe.

Ideal Solution

A solution that obeys Raoult's Law exactly.

Molarity

Number of moles of solute per litre of solution.

Half-Life

The time required for half of a reactant to be converted into product(s). The time required for half of a given sample to undergo radioactive decay.

Photon

A packet of light or electromagnetic radiation, also called quantum of light.