Leah.J
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I will try to insert a picture if I I figure out how
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Joseph5364
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the rate of reaction does not change even if you increase or decrease the conc. It is shown as a straight horizontal line on a concentration-time graph I believe and a negative gradient on a rate-concentration graph (might be wrong here)
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Leah.J
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Name:  8106096B-36FC-488F-BEDE-365920EE433F.jpeg
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Size:  21.1 KB The following is a picture of notes my teacher gave us .
I don’t understand why t1/2 increases
If it’s a zero order rxn , shouldn’t t1/2 decrease ?
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MexicanKeith
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(Original post by Leah.J)
Name:  8106096B-36FC-488F-BEDE-365920EE433F.jpeg
Views: 19
Size:  21.1 KB The following is a picture of notes my teacher gave us .
I don’t understand why t1/2 increases
If it’s a zero order rxn , shouldn’t t1/2 decrease ?
Incredibly poorly worded notes:
"t1/2 will be higher"
higher than what exactly!

as the reaction progresses for zero order reactions the half life does of the reagent does indeed become shorter and shorter (ie if the concentration starts at 100moldm^-3 and reaches 50moldm^-3 in 10 seconds, then the concentration will half again to 25moldm^-3 in just 5 more seconds and so on.

So the only type of reaction for which the half life is a useful value is a first order reaction, because this shows an exponential decay of reagent, so the half life is a constant for a given first order reaction! For zero or second order reactions the half life depends on initial concentration so its less useful!
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