Using TANGENTS to calculate rate of reaction AQA A-Level Biology

[@lottiecook4552]

Very helpful thank you!

[@mrhowebiology7667]

👏 👏

[@jaydaly8948]

Thank you, very helpful for the OCR board as well.

[@mrhowebiology7667]

Thanks for commenting! Glad it helped 😄

[@mia-janeallen2542]

Do you know where i can find practice questions on this?

[@yusra2506]

How do you know what size to draw the triangles because surely if they’re bigger or smaller the answer will change? Would there be some leniency with the answers?

[@mrhowebiology7667]

So it's more a case of how steep the angle is - steeper angles will mean a faster rate of reaction. Drawing the triangle a little larger should give you more accurate data to work with. You will be given a range in most cases for AQA in the mark schemes too.

[@yusra2506]

@@mrhowebiology7667 Alright thank you :)

[@mrhowebiology7667]

How do you find graph questions?

[@hydraph4843]

I am sort of 50/50 on these questions, as I am with most maths questions in biology in general. With tangents, I feel like I can never actually draw them correctly. I know roughly where to draw it, at the start of the graph for instance, but the angle seems to be slightly off or something and I don't get full marks

[@mrhowebiology7667]

@@hydraph4843 it’s definitely tricky to get this skill down!

[@miketyson-g6b]

txs

[@jakeyplayz989]

I’m sorry but I still don’t fully get it. When you are going from initial rate of reaction of t=0 how do you know where to stop your line? How do you know where to draw your triangle from and get the correct number?

[@jakeyplayz989]

Like why are you choosing 30 in the first example for the y axis? When the triangle inside it is more like 20? This is the part I don’t get, I have seen it on other examples too and it is probably a simple reason but I don’t understand the numbers being come up with on the y axis in all the examples I have seen?