Chemistry 1301A/B Lecture Notes - Lecture 28: Half-Life, Elementary Reaction, Reaction Intermediate

• School: Western University
• Department: Chemistry
• Course: Chemistry 1301A/B
• Professor: Felix Lee

Document Summary

Half-life (t1/2) is the time required for half of a sample to react (or decay in the case of nuclear processes). In general, the rate constant (k) can be used to qualitatively determine the speed of a reaction, as a large k corresponds to a fast reaction and a small k a slow reaction. However, in order to quantitatively determine the rate, you need to use t1/2. For the rxn: so2cl2 (g) the half-life of the rxn. /s a) calculate: by inspecting the reactant side of eq"n, can tell it is a first order rxn use t1/2 = 0. 693, k t1/2 = 0. 693/2. 2x10. [so2cl2] to be reduced to 1/8 of its original. In general, the [reactant] that is left after n half- lives have passed can be expressed as: x[reactant]0 = (1 2)n. [reactant]0 x = (1 2)n x [reactant]0 x[reactant]0 = (1 2)n x. Number of half-lives in 6. 0 h = 3. 0 half-lives 2. 0 h.