Negative rates of formation


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Shannon Han 2B
Posts: 48
Joined: Fri Sep 26, 2014 2:02 pm

Negative rates of formation

Postby Shannon Han 2B » Sun Feb 22, 2015 3:29 pm

If the given rate of decomposition of a reactant is positive, is the rate of formation of a product also positive? Or is it negative since the rate of decomposition is negative?

Kayla Denton 1A
Posts: 106
Joined: Fri Sep 26, 2014 2:02 pm

Re: Negative rates of formation

Postby Kayla Denton 1A » Sun Feb 22, 2015 3:34 pm

Rates are never expressed as negative!
Rate of formation of products = delta P / delta t whereas rate of consumption of reactants = -(delta R)/delta t... the negative is there because the change in reactants will be negative as reactants decrease, but rate must be expressed as positive so the - cancels out.

Justin Le 2I
Posts: 142
Joined: Fri Sep 26, 2014 2:02 pm

Re: Negative rates of formation

Postby Justin Le 2I » Wed Feb 25, 2015 1:31 am

k is also always positive because rates are always positive.


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