Drawing a tangent to find instantaneous rate of reaction

Step by step instructions of how to draw a tangent to find the instantaneous rate of reaction from a graph. Suitable for GCSE Chemistry or GCSE Combined Science Higher.
Link to image of the graph so you can print it and draw along with the video: drive.google.c...

[@sirius9487]

Hello Mr.Poliakoff, thankyou for this simple and direct video. Just started tutoring a kid recently so I often find myself re-touching some basics. You have been a big help :)

[@SimonPoliakoff]

Glad to help. It is nice when a video I made for my students to draw along with in a lesson can benefit many more as a youtube video. I find that a video of what you actually do on the paper is so much more useful than a fancy powerpoint animation.

[@Looooooooos]

Straight to the point! Thank you very much sir❤ you deserved a sub!

[@SimonPoliakoff]

Glad you found it useful.

[@DrSP1800]

This was the most helpful video I found for this, I have my chemistry exam tomorrow! :o

[@SimonPoliakoff]

Glad you found it useful. If you have physics on Friday I have videos for vector resultant force and motion graphs which you might find useful.

[@DrSP1800]

@Simon Poliakoff I have a feeling that physics is on Friday so I'll check it out if so, thank you!

[@ayon1384]

this is just what i was looking for. thank you good sir

[@SimonPoliakoff]

You are most welcome. Good luck with your studies.

[@aestheticqueen1481]

Thank you so much for this I was puzzled on a question in biology gcse combined science and this helped me a lot. Thank you

[@SimonPoliakoff]

Glad you found it useful. If the x-axis is time the method will give you the rate of change of whatever is on the y-axis.

[@JohnW.-zt2zj]

Oh so that's how you must position the ruler. I always did it from underneath the point rather than from above which is why I must be getting wrong measurements all the time. Thanks for the video!

[@SimonPoliakoff]

Glad that the video helped. I made it for a class of 20 students I was teaching. It is pleasing that it has potentially helped a lot more on KZbin as well.

[@GingerNinjaJazz]

Life-saver!

[@mehak6892]

Thanks for the direct method!

[@SimonPoliakoff]

You are welcome.

[@BwalyaKakula]

This was really helpful thanks ❤

[@SimonPoliakoff]

Glad you found it useful.

[@melodyhilda6662]

I've a Chemistry exam tomorrow, thank you 😊

[@SimonPoliakoff]

Good luck.

[@est7742]

this is very helpful, thank you very much

[@SimonPoliakoff]

Glad you found it useful.

[@omitoj0hn0sh0n4]

Stampylonghead doing maths now???

[@omitoj0hn0sh0n4]

(Not a rude thing but a compliment)

[@SimonPoliakoff]

Glad you liked it.

[@somethingstupidverystupid6353]

Minecraft wasn’t raking in enough views

[@ProspectPMC]

thank you sir saved my mocks

[@SimonPoliakoff]

Glad you found it useful!

[@Kronen777]

Thanks ...tomorrow...is my exam...just wanted have a glance on it before going further...god save me tomorrow..

[@SimonPoliakoff]

good luck.

[@seearoundyeah2672]

omg stampylonghead ^_^

[@es14hellothere]

not just me who thought that lol

[@raaam1234]

In time vs concentration graph instantaneous rate equals to the 1) Area of graph. 2) X axis. 3) Y axis 4) slope of the tangent??

[@SimonPoliakoff]

If concentration of product then it would be slope of tangent. If concentration of reactant (which decreases with time) it would be the negative of the slope of the tangent to give a positive number.

[@kanvardeepbainsal9558]

thanks for video, but how do i know what angle the ruler is at the tanget, it can be at the point but still different angles?

[@SimonPoliakoff]

Position the ruler so it touches the point but does not cross the line. If you still think there is a range of possible angles then go for the middle of the range.

[@Geeth88054]

Thanx mr

[@SimonPoliakoff]

You are welcome

[@YeeMedievalJouster]

How do I know how long to draw the tangent line ? Because it will alter my ends results

[@SimonPoliakoff]

The exact length doesn’t matter. The gradient will come out the same but it is more accurate if you draw it longer.

[@Kais22]

thank you

[@eduardo52s]

How would you do 30 seconds ? Do I just put a straight line or let it go straight through the lines?

[@SimonPoliakoff]

The tangent line you draw in should just touch the curve at 30s but not cross it. Ignore any of the other tangent lines you gave drawn at other times.

[@eduardo52s]

THx@@SimonPoliakoff

[@chanelnom5]

POV: leaving cert chemistry

[@fln1481]

When we use secant ?

[@SimonPoliakoff]

You always draw a tangent to find the rate of change on a something-time graph. In this context the tangent means a straight line following the gradient of the curve at that point.

[@fln1481]

​@@SimonPoliakoff thanks

[@lalaloopsiee1717]

bro you literally saved my life, thank youu🫶🏾

[@SimonPoliakoff]

Glad you found it useful.

[@tokenlb]

Thank you

[@SimonPoliakoff]

You are welcome.