For a given reaction the half-life, t1/2, of a reactant is the time required for its concentration to reach a value that is the arithmetic mean of its initial and final (equilibrium) value.
Half-life is constant for first-order reactions.
t1⁄2 =
ln 2
k
Half-life is not constant for second-order reactions but rather it varies with initial concentration and k.
t1⁄2 =
1
k·[A]o
half-life → vrijeme poluraspada
For a simple radioactive decay process, half-life, t1/2, is defined as the time required for the activity of a given radioactive isotopes to decrease to half its value by that process.
N = N0 / 2
The half-life is a characteristic property of each radioactive isotope and is independent of its amount or condition.
limiting reactant → mjerodavni reaktant
Limiting reactant is a reactant in a chemical reaction that limits the amount of product that can be formed. The reaction will stop when the entire limiting reagent is consumed. These other reactants are present in excess.
reactant → reaktant
Reactants are initial materials in a chemical reaction.
half-cell → polučlanak
Half-cell is a part of galvanic cell in which oxidations or reduction of an element in contact with water or water solution one of its compounds.
half-wave potential → poluvalni potencijal
Half-wave potential (E1/2) is a potential at which polarographic wave current is equal to one half of diffusion current (id). In a given supporting electrolyte, the half-wave potential is unique for each element and its different valence states and chemical forms. Observation of a current peak at a specific half-wave potential therefore identifies the chemical species producing the current.
