exponential decay


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505095793
Posts: 61
Joined: Fri Sep 28, 2018 12:25 am

exponential decay

Postby 505095793 » Sat Mar 16, 2019 11:35 am

Why do reactions slow as time goes on? Would a reaction still slow if we had excess reactants?

405112316
Posts: 62
Joined: Fri Sep 28, 2018 12:17 am

Re: exponential decay

Postby 405112316 » Sat Mar 16, 2019 11:40 am

Rate laws are usually directly dependent on the amount of reactants, so if the reactants are lower, the rate law will be lower.

Luc Lorain 1L
Posts: 59
Joined: Fri Sep 28, 2018 12:18 am

Re: exponential decay

Postby Luc Lorain 1L » Sat Mar 16, 2019 2:49 pm

It all depends on our understanding of half life. Half life, as you know, is the time it takes for 50% of a sample to decay or otherwise react. As we progress through time, the mass/concentration of the sample decreases rapidly, until only a very small amount is left. The decay follows asymptotic behavior at this point; it will always try to decrease by a factor of 1/2, and theoretically never reach zero.


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