## Negative rates of formation

$aR \to bP, Rate = -\frac{1}{a} \frac{d[R]}{dt} = \frac{1}{b}\frac{d[P]}{dt}$

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

### Negative rates of formation

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

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

k is also always positive because rates are always positive.