SAT Subject Test Chemistry,10 edition

The characteristic wavelengths of electromagnetic radiation emitted or absorbed by an object,
atom, or molecule.

Spin quantum number (ms)

Spin    quantum number  (ms)

The fourth  quantum number, indicating  the orientation of  the intrinsic   angular momentum    of

an electron in an atom. The spin quantum number can only assume values of or .

Spontaneous process

Spontaneous process

A   process that    will    occur   on  its own without energy  input   from    the surroundings.

Standard conditions

Standard conditions
Conditions defined as 25°C and 1 M concentration for each reactant in solution, and a partial
pressure of 1 atm for each gaseous reactant. Used for measuring the standard Gibbs free energy,
enthalpy, entropy, and cell EMF.

Standard free energy (G°)

Standard    free    energy  (G°)

The Gibbs   free    energy  for a   reaction    under   standard    conditions. See Gibbs   free    energy.

Standard hydrogen electrode (SHE)

Standard hydrogen electrode (SHE)
The electrode defined as having a potential of zero under standard conditions. All redox
potentials are measured relative to the standard hydrogen electrode. The potentials are measured
relative to the standard hydrogen electrode at 25°C and with 1.0 M of each ion in solution.