J H J You H What is the rate law for the proposed mechanism? The half-life of 22
ID: 928849 • Letter: J
Question
J H J You HWhat is the rate law for the proposed mechanism? The half-life of 226 Ra is 1.60 time 10^3 years. How long until only 12.5 percentage of the original sample of 226 Ra remains? According to the collision model for chemical reactions, most reaction rates increase when the temperature of the reaction is increased because molecules most collide to react. molecules must have the proper orientation at collision to react. the activation energy of the reaction is lowered as the temperature increases. more collisions have the minimum energy needed for a reaction to occur.
Explanation / Answer
38) Rate deends on slowest stp of mechansim. Hence rate = k[A]^2 .Hence D
39) 100 to 50 takes 1 half life. 50 to 25 takes another half life.. 25 to 12.5 takes another half life
Total 3half lives = 3 ( 1.6 x10^3) = 4.8 x 10^3 . Hence A
40) Option D , since collisions with higher energy happens which is required for reaction.
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