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Y2O3: A white, water-insoluble powder, Y2O3, used chiefly in incandescent gas and acetylene mantles.

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Nuclear Binding Energy

Energy equivalent of the mass deficiency, energy released in the formation of an atom from the subatomic particles.

 

Stoichiometry

Description of the quantitative relationships among elements and compounds as they undergo chemical changes.

All Chemicals - Chemical Glossary

The Chemical Glossary currently has 651 chemical entries. You may search the Chemical Glossary by entering the keyword in the search box or by browsing the entire chemical glossary by letter in alphabetical order.

Periodicity

Regular periodic variations of properties of elements with atomic number (and position in the periodic table).

Water Equivalent

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

Nonbonding Orbital

A molecular orbital derived only from an atomic orbital of one atom, lends neither stability nor instability to a molecule or ion when populated with electrons.

Heterogeneous Catalyst

A catalyst that exists in a different phase (solid, liquid or gas) from the reactants, a contact catalyst.

Homogeneous Equilibria

Equilibria involving only one species in a single phase. For example, all gases, all liquids or all solids.

Differential Thermometer

A thermometer used for accurate measurement of very small changes in temperature.

Pairing Energy

Energy required to pair two electrons in the same orbital.