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# Graph help - Rates watch

1. I have real trouble with graphs so could someone please explain the following?

I'm confused how they've worked it out.

2. (Original post by yesioo)
I have real trouble with graphs so could someone please explain the following?

I'm confused how they've worked it out.

The gradient to the curve is the rate. They have taken several rates at different concentrations
3. The gradient to the curve is the rate. They have taken several rates at different concentrations
Can you explain the calculations?
4. (Original post by yesioo)
Can you explain the calculations?
The gradient is obtained by dividing the concentration difference by the time difference in seconds
5. A few things:

1)
The first calculation at concentration 1.5 moldm-3 relates to the dotted blue line
The second calculation at concentration 1.0 moldm-3 relates to the dotted red line
The third calculation at concentration 0.5 moldm-3 relates to the dotted black line

2)
All calcu
lations are concentration from where the line intersects the y axis divided by time taken. The 60 is to convert minutes to seconds.

3)
The reason why the concentration in the first calculation
is equal to that of the sampling point is that it is being done at time elapsed = 0 and hence is taken from the point it intersects the y axis.

The gradient of a straight line slope is always vertical divided by horizontal (or y divided by x).

I hope that helps
6. A few things:

1)
The first calculation at concentration 1.5 moldm-3 relates to the dotted blue line
The second calculation at concentration 1.0 moldm-3 relates to the dotted red line
The third calculation at concentration 0.5 moldm-3 relates to the dotted black line

2)
All calcu
lations are concentration from where the line intersects the y axis divided by time taken. The 60 is to convert minutes to seconds.

3)
The reason why the concentration in the first calculation
is equal to that of the sampling point is that it is being done at time elapsed = 0 and hence is taken from the point it intersects the y axis.

The gradient of a straight line slope is always vertical divided by horizontal (or y divided by x).

I hope that helps
Ahh I see now!

Thanks alot! + rep for you

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