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Weighted average of the masses of the constituent isotopes of an element, The relative masses of atoms of different elements.

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Water Equivalent

The amount of water that would absorb the same amount of heat as the calorimeter per degree temperature increase.

Semipermable Membrane

A thin partition between two solutions through which certain molecules can pass but others cannot.

Cloud Chamber

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

Bubbles

Have you ever noticed that soap bubbles go up in winter and fall down in summer? The reason is that warm air is lighter than cold. And in winter the difference between the air temperature in the room (especially near the windows) and the one you exhale into the bubble is enough to overcome the heaviness of its shell.

Double Bond

Covalent bond resulting from the sharing of four electrons (two pairs) between two atoms.

Substitution Reaction

A reaction in which an atom or a group of atoms is replaced by another atom or group of atoms.

Hydrolysis

The reaction of a substance with water or its ions.

Critical Point

The combination of critical temperature and critical pressure of a substance.

Sigma Orbital

Molecular orbital resulting from head-on overlap of two atomic orbitals.

Amide

Compound containing the O-C-N group.Compound that can be considered a derivative of ammonia in which one or more hydrogens are replaced by a alkyl or aryl groups.