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# 26.8: H

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half-life
the time interval required for a quantity of material to decay to half its original value
halogens
Group 7A of the periodic table
heat
the flow of thermal energy from a warmer object to a cooler object
heat content
the total of all forms of energy for a substance
heat of condensation
the quantity of heat released when a unit mass of a vapor condenses to liquid at constant temperature
heat of fusion
the quantity of heat released when a unit mass of liquid freezes to a solid at a constant temperature
heat of vaporization
the quantity of heat required to vaporize a unit mass of liquid at constant temperature
Heisenberg uncertainty principle
it is impossible to know both the precise location and the precise velocity of an electron at the same time
Henry’s law
states that at a given temperature, the solubility of a gas in a liquid is proportional to the partial pressure of the gas above the liquid
hertz (Hz)
the SI unit used to measure frequency; one hertz is equivalent to 1 cycle per second
Hess’s Law
if multiple reactions are combined, the enthalpy $(\triangle H)$ of the combined reaction is equal to the sum of all the individual enthalpies
heterogeneous mixture
a mixture that consists of visibly different substances
homogeneous mixture
a mixture that is uniform throughout
Hund’s rule
a rule that states that no electrons are paired in a given orbital until all the orbitals of the same sub-level have received at least one electron
hydration
the process of water molecules attaching to ions
hydrocarbon
an organic substance consisting of only hydrogen and carbon
hydrogen bond
a type of strong polar attraction between a hydrogen atom in one molecule and a highly electronegative atom, such as N, O, or F, in another molecule.
hydronium ion
a positively charged ion consisting of three hydrogen atoms and one oxygen atom (H3O+)
hydroxyl group
an oxygen atom bound covalently with a hydrogen atom
hypothesis
a tentative explanation that can be tested by further investigation

Feb 23, 2012

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Aug 01, 2014
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CK.SCI.ENG.SE.2.Chemistry-Glossary.26.8