OCR F324-June 2013 Chemistry

Hi, i was wondering if you have done the evaluative on electrode potentials? This is my last chance to do well in the practicals, and my highest mark is 10/15! Please help anyone to give me tips

When you're on buddy, quote me and give me a question please! I had to go and churn some butter, so I was idle earlier.

Sure


Define retention time (2)

I'm not sure if I have but if you know it's on electrode potentials then you should just learn everything you know about them and then apply it to the questions that come up, but we're not allowed to talk about or say anything about the practicals as its against the rules really.

Just stay calm during the assessment and read everything through carefully before beginning to answer the questions, you should be fine


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Do you know what the grade boundaries overall are for an A ish? Apprently, last year the grade boundaires where 36 for an A!!!

Sure


Define retention time (2)

I'm not sure! I really don't want to look in the book...so I'm gonna guess.

Is it the time it takes for the sample to be detected?

I've just went on the assumption that they'll be similar to last years hopefully, I think I've got 37 so I should be safe, I hope!


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I'm not sure! I really don't want to look in the book...so I'm gonna guess.

Is it the time it takes for the sample to be detected?

oh no, im on a C, and i need an A overall to get into medicine!!!

oh no, im on a C, and i need an A overall to get into medicine!!!

The time it takes to go from the column inlet to the detector, me thinks.

Ooh, a fellow potential medic! Where are you hoping to go? I wouldn't worry too much about coursework, obviously boost it as much as possible, but the exams are the main things, you don't have to do really well at coursework to do well overall

oh no, im on a C, and i need an A overall to get into medicine!!!

nearly!!

you have to state coloumn inlet !

my turn bud

The time it takes to go from the column inlet to the detector, me thinks.

close, its the time taken for the sample/substance/compound to move from the coloumn inlet to detector

my tuen

Okay, maybe next time.

Explain the process of Gas Chromatography (4)

Ok! Thanks!



Thanks otrivine, so this is only with GC then right?

How many carbon environments are in prop,1,2,3,triol?
And which proton NMR splitting peaks present?

Sorry if this is worded a bit...blah.

Gas Chromastography, in stationary phase, you use a solid or liquid with an inert support and for mobile phase you use a carrier gas.

The retention time is the time taken for a component in GC to move from column intert to detector.

So the carrier gas , in liquid phase travel to the capillary action and then to the detector in which the componenent is detected. GC is the process also which separates a component from its mixture, and this is done via the stationary phase in which the material is adsorbed onto its surface and greater interaction between component and stationary phase the speed becomes less and separates mixture