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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.

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Geometrical Isomers

Compounds with different arrangements of groups on either side of a bond with restricted rotation, such as a double bond or a single bond in a ring, for example cis-trans isomers of certain alkenes. Stereoisomers that are not mirror images of each other, also known as position isomers.

Coordinate Covalent Bond

A covalent bond in which both shared electrons are donated by the same atom, a bond between a Lewis base and a Lewis acid.

Dilution

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

Exothermic

Describes processes that release heat energy.

Density

Density is the ratio b/w Mass and Volume: D=M/V

Physical Change

A change in which a substance changes from one physical state to another but no substances with different composition are formed. Example Gas to Liquid - Solid.

 

Spectrum

Display of component wavelengths (colours) of electromagnetic radiation.

Saccharide

An organic compound containing a sugar or sugars.

Endothermic

Describes processes that absorb heat energy.

Lanthanide Contraction

A decrease in the radii of the elements following the lanthanides compared to what would be expected if there were no f-transition metals.