Rate of Reactant

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Erik Buetow 1F
Posts: 96
Joined: Fri Aug 30, 2019 12:15 am

Rate of Reactant

Postby Erik Buetow 1F » Sun Mar 01, 2020 9:19 pm

Will the rate of reaction for reactants always decrease over time? Or is this only true for favorable reactions?

Kate Osborne 1H
Posts: 102
Joined: Fri Aug 30, 2019 12:16 am

Re: Rate of Reactant

Postby Kate Osborne 1H » Sun Mar 01, 2020 9:27 pm

rate always decreases because as you form products you start to form reactants again

Fdonovan 3D
Posts: 101
Joined: Sat Aug 17, 2019 12:16 am

Re: Rate of Reactant

Postby Fdonovan 3D » Sun Mar 01, 2020 9:44 pm

Because reactants get depleted over time, the rate of the forward reaction will decrease. Initially, there are usually a lot of collisions between molecules which slows as more reactants go to products.

Sofia Barker 2C
Posts: 101
Joined: Wed Sep 18, 2019 12:21 am

Re: Rate of Reactant

Postby Sofia Barker 2C » Sun Mar 01, 2020 9:47 pm

for any reaction aA --> bB + cC, the rate based on the concentration of reactants is negative (-1/a * d[A]/dt) because the concentration of reactants decreases over time as products are formed. In the reverse reaction, A becomes a product and thus its rate is positive because its concentration increases as more and more of it is formed over time.

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