## General Meaning of "Zero Order" Reactions

$\frac{d[R]}{dt}=-k; [R]=-kt + [R]_{0}; t_{\frac{1}{2}}=\frac{[R]_{0}}{2k}$

Layal Suboh 1I
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Joined: Fri Sep 28, 2018 12:23 am

### General Meaning of "Zero Order" Reactions

What does it mean for a reaction to have zero order?

Emma Scholes 1L
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Joined: Fri Sep 28, 2018 12:18 am

### Re: General Meaning of "Zero Order" Reactions

In a zero order reaction, the rate of the reaction does not depend on the concentration of the reactant.

Danielle_Gallandt3I
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### Re: General Meaning of "Zero Order" Reactions

This typically occurs when the reactant concentration is already very high, so adding more reactant doesn't change the rate

Yvonne Du
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Joined: Fri Sep 28, 2018 12:23 am

### Re: General Meaning of "Zero Order" Reactions

Danielle_Gallandt3I wrote:This typically occurs when the reactant concentration is already very high, so adding more reactant doesn't change the rate

Thank you for clarifying!

Jessica Tsui 1H
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### Re: General Meaning of "Zero Order" Reactions

Zero-order reactions can also occur when there is a catalyst, so the reaction would depend on the catalyst instead of the concentration of reactant.

Celine Cheng 1H
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### Re: General Meaning of "Zero Order" Reactions

If the reaction rate is dependent on a catalyst, does that mean the substrate has to be in high concentration as well?

Saman Andalib 1H
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Joined: Fri Sep 28, 2018 12:16 am

### Re: General Meaning of "Zero Order" Reactions

This means that the reaction rate does not depend on the particular amount of a specific reactant (that is 0 order).

haleyervin7
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Joined: Fri Sep 28, 2018 12:15 am

### Re: General Meaning of "Zero Order" Reactions

Celine Cheng 1H wrote:If the reaction rate is dependent on a catalyst, does that mean the substrate has to be in high concentration as well?

Dr. Lavelle said to assume the catalyst/enzyme is saturated with substrate (meaning it is already working at maximum capacity) so adding substrate doesn't change the rate.