Solution that resists change in pH, contains either a weak acid and a soluble ionic salt of the acid or a weak base and a soluble ionic salt of the base.
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The smallest particle of an element.
Ytterbia is a colorless compound, Yb2O3, used in certain alloys and ceramics. Also known as ytterbium oxide.
The zero point on the absolute temperature scale, -273.15°C or 0 K, theoretically, the temperature at which molecular motion ceases. The concept of an absolute zero temperature was first deduced from experiments with gases. When a fixed volume of gas is cooled, its pressure decreases with its temperature. Absolute zero physically possesses quantum mechanical zero-point energy.
The number (6.022x10^23) of atoms, molecules or particles found in exactly 1 mole of substance.
Electrons in filled sets of s , p orbitals between the nucleus and outer shell electrons shield the outer shell electrons somewhat from the effect of protons in the nucleus, also called screening effect.
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.
Surfaces upon which oxidation and reduction half-reactions, occur in electrochemical cells.
Adhesion of a species onto the surfaces of particles.
Refers to species that have only six electrons in the highest energy level of the central element (many Lewis acids).
Adverse health effects resulting from skin exposure ot a substance.
A salt containing an ionizable OH group.
The amount of heat required to raise the temperature of a body (of any mass) one degree Celsius.
Describes processes that absorb heat energy.
A physical state of matter which exists at extremely high temperatures in which all molecules are dissociated and most atoms are ionized.
CA3COOH, clear, colorless liquid, pungent odor. Boiling point 140C, flash point 54C (closed cup), autoignition temperature 38OC.
At the same temperature and pressure, equal volumes of all gases contain the same number of molecules.
Anything that has mass and occupies space.
Solution in which no more solute will dissolve.
A large molecule consisting of chains or rings of linked monomer units, usually characterized by high melting and boiling points.
The arrangement of atoms (not lone pairs of electrons) around a central atom of a molecule or polyatomic ion.