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A large molecule consisting of chains or rings of linked monomer units, usually characterized by high melting and boiling points.

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    One of the most interesting and obvious chemical experiments is the experiment on the interaction of copper sulfate and calcium carbonate. The latter is contained in the shell of a simple egg, but copper sulphate should be searched in a chemical reagent store. This experience is simple, but...

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Deposition

The direct solidification of a vapor by cooling, the reverse of sublimation.

Condensation

Liquefaction of vapor.

Law of Partial Pressures (Dalton's Law)

The total pressure exerted by a mixture of gases is the sum of the partial pressures of the individual gases.

Radioactive Tracer

A small amount of radioisotope replacing a nonradioactive isotope of the element in a compound whose path (for example, in the body) or whose decomposition products are to be monitored by detection of radioctivity, also called a radioactive label.

Percentage Ionization

The percentage of the weak electrolyte that ionizes in a solution of given concentration.

Chemical Change

A change in which one or more new substances are formed.

Lewis Base

Any species that can make available a share in an electron pair.

Alloying

Mixing of metal with other substances (usually other metals) to modify its properties.

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.

Cloud Chamber

A device for observing the paths of speeding particiles as vapor molecules condense on them to form foglike tracks.