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# -1 order of reaction? need help! watch

1. Hi i need to find out what order of reaction it is when the graph of initial rate against concentration comes out with a negative gradient but where initial rate and concentration are proportional like this:

|
|--\
|---\
|----\
|-----\
|----- \
|-------\
|--------\
|---------\
|----------\
|____________________________

but without the (-)s

i hope my amusing attempt at a diagram will trick you into a pity reply
2. From the graph, your line is curved, The rate decreases as the concentration decreases and thus has a constant half life. The order of reaction will therefore be first.
If the half life increases as the reaction goes on then the order is 2nd. But i think you have a first order.
3. (Original post by ManPowa)
From the graph, your line is curved, The rate decreases as the concentration decreases and thus has a constant half life. The order of reaction will therefore be first.
If the half life increases as the reaction goes on then the order is 2nd. But i think you have a first order.
Rate decreases as concentration increases I thought..
4. (Original post by feetfailmenot)
Hi i need to find out what order of reaction it is when the graph of initial rate against concentration comes out with a negative gradient but where initial rate and concentration are proportional like this:

|
|--\
|---\
|----\
|-----\
|----- \
|-------\
|--------\
|---------\
|----------\
|____________________________

but without the (-)s

i hope my amusing attempt at a diagram will trick you into a pity reply
What exam board are you?

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