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Removal of some ions from solution by precipitation while leaving other ions with similar properties in solution.

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Extensive Property

A property that depends upon the amount of material in a sample.

Octane Number

A number that indicates how smoothly a gasoline burns.

Moderator

A substance such as hydrogen, deuterium, oxygen or paraffin capable of slowing fast nuetrons upon collision.

Formula

Combination of symbols that indicates the chemical composition of a substance.

 

Partial Pressure

The pressure exerted by one gas in a mixture of gases.

Three ways to make patina at home

The first way is ammonia patination. To do this, take a plastic container. Put a couple of paper or ordinary towels at the bottom. Moisten them with ammonia. Then sprinkle with large table salt.

Hydrogen Bond

A fairly strong dipole-dipole interaction (but still considerably weaker than the covalent or ionic bonds) between molecules containing hydrogen directly bonded to a small, highly electronegative atom, such as N, O, or F.

Second Law of Thermodynamics

The universe tends toward a state of greater diorder in spontaneous processes.

Distilland

The material in a distillation apparatus that is to be distilled.

Percent by Mass

100% times the actual yield divided by theoretical yield.