Calculating rate of reaction, is it on the course?

[cameron_15]

Pretty much as the title suggests...

Came across it in TSFX 2010 question 1ai and 1aii...

I've never had to do anything like this before, it's not in my textbook or my teachers note, I am yet to consult the study design, but is this something you've studied/ I should have studied?

Also, Is the rate of reaction just change in concentration over change in time?

Thank you to all those who can enlighten me...

[iNerd]

A+B >>> C+D
To calculate rate of reaction you measure the rate at which A and B are consumed or at which C and D are produced.
This is what we learn in Year 10 anyway

[cameron_15]

I understand what it is... Just not how to calculate a numerical value for it, going through the worked solution for it makes sense, I'm just not sure whether or not it's examinable or not, it's certainly the first time i've encountered such a question.

thanks for your help!

[slothpomba]

I dont think it really is in the course per se.

Reminds me of a sac question though... they put chips of something into a solution of some sort, it evolved a gas, the top of the flask was sealed and a gas syringe was attatched. Every like 10 seconds, youd take a reading off the gas syringe and see how far back the gas produced pushed it back. In that way i guess you could measure the rate of how much gas was made.... not really in proper numbers though. It's a more arbitrary thing that way of measuring.

(they altered the amount of chips, conc of solution, temp, ect and measured how far the gas syringe was pushed back)

[Potter]

They should give you enough information in the question to figure out the answer intuitively. I haven't seen the question, but I'm pretty confident that's the case.
There was a question on the neap 10' exam to do with a reaction profile diagram and carbocations which really surprised me. However, they gave enough information to answer the question. 

[scocliffe09]

Nope I don't think it's on the course...
BUT it's not too hard and it's worth understanding anyway...
indeed it's just change in concentration over time - I think what Irena was trying to test was an understanding that the gradient of a conc/time graph represents the rate of reaction (which is a very useful understanding to have when you're trying to redraw graphs based on condition changes)

[cameron_15]

Yeah, I've read over the study design and it only requires us to identify and understand the ways in which rate is effected (or something along those lines).

Also, Congratulations on last years scores! Very impressive

[8039]

They should give you enough information in the question to figure out the answer intuitively. I haven't seen the question, but

Not really you need to know which formula to use...