## Negative Order

Hellen Truong 2J
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### Negative Order

After you determine what order the reaction is with respect to each reactant, what does it mean conceptually when you get a negative order?

Hazem Nasef 1I
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### Re: Negative Order

A negative order means that as the concentration of that substance is increased, the rate of the reaction decreases. An example of this would be a product with a negative order. If the concentration of this product is increased, it participates in a reverse reaction, thereby slowing down the reaction rate.

skalvakota2H
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### Re: Negative Order

A negative order means that the concentration of a species inversely affects the rate of a reaction.

Jenny Cheng 2K
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### Re: Negative Order

A negative order means the concentration appears in the denominator of the rate law. Increasing the concentration of the species (usually a product) slows down the reaction.

Jasmin Tran 1J
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### Re: Negative Order

A reaction rate can have a negative partial order with respect to a substance. For example, the conversion of ozone (O3) to oxygen follows the rate equation (rate = k[O3]^2/[O2]) in an excess of oxygen. This corresponds to second order in ozone and order (-1) with respect to oxygen. When a partial order is negative, the overall order is usually considered as undefined, so in above example, the reaction is not described as first order even though the sum of the partial orders is 2 + (-1) = 1, because the rate equation is more complicated than that of a first-order reaction.

Brandon Fujii 1K
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### Re: Negative Order

A negative first order would occur if a the rate is halved when the concentration of a reactant is doubled.

diangelosoriano
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Joined: Fri Sep 29, 2017 7:07 am

### Re: Negative Order

Are there ever occurrences of negative orders less than -1? Will these be possible / conceptually what would that mean in relation to rates / changing concentration?

Sophia Bozone 2G
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Joined: Fri Sep 29, 2017 7:07 am

### Re: Negative Order

Conceptually, a reaction with a negative order means that as you increase the concentration of reactant, the reaction rate actually decreases. This seems to eb an interesting phenomena to me, and I 'm sent sure of any real life examples of it.