[Doctor.]

Will be doing both Stage one and two tomorrow. They will involve me making a table and Graph. Need help on the following questions:

1) In stage one (table) does my table actually matter? (I am awful at designing the table lol ) Looking at past papers/Mark schemes, it seems you are only given marks based on what you write (ie independent, dependent and units etc), not the layout of the table?

2) In stage two (graph) there is usually one mark allocated to "Rate of reaction calculated correctly" How do I actually work it out? What figures would I use?


Will really appreciate your help and will +rep all helpful advice Thank you!

[Cola_23]

U mean GCSE ISA?

Yes, the table does matter. There's 1 mark for correct headings i.e. the independent and dependent variable. Another mark for all correct units stated.

What do you mean by how do you work it out? You get the data from your table and that data from doing your experiment. For the graph you have 1 mark for x axis (labelled with units) and 1 mark for y axis. 1 mark for the points correctly plotted and 1 mark for a suitable line of best fit drawn on the graph.

[Doctor.]

(Original post by Cola_23)
U mean GCSE ISA?

Yes, the table does matter. There's 1 mark for correct headings i.e. the independent and dependent variable. Another mark for all correct units stated.

What do you mean by how do you work it out? You get the data from your table and that data from doing your experiment. For the graph you have 1 mark for x axis (labelled with units) and 1 mark for y axis. 1 mark for the points correctly plotted and 1 mark for a suitable line of best fit drawn on the graph.

Nope I mean AS level, sorry didn't mention that in the OP
It's a little bit more complex from what you explained, you're supposed to actually calculate the Rate from your results. just confused on ow to actually do that

[dongonaeatu]

(Original post by Doctor.)
Nope I mean AS level, sorry didn't mention that in the OP
It's a little bit more complex from what you explained, you're supposed to actually calculate the Rate from your results. just confused on ow to actually do that

apparently you have to be able to do standard deviation.

[Doctor.]

(Original post by dongonaeatu)
apparently you have to be able to do standard deviation.

Really? Where does it say that anywhere?

From the mark schemes, the most I have seen is mean (1 mark) & Rate of the reaction/Additional Calculation (1 mark). -Although I guess you could label SD as an 'additional calculation'.

Still don't understand how to work out rate though

anyone wanna explain? Please

[dongonaeatu]

(Original post by Doctor.)
Really? Where does it say that anywhere?

From the mark schemes, the most I have seen is mean (1 mark) & Rate of the reaction/Additional Calculation (1 mark). -Although I guess you could label SD as an 'additional calculation'.

Still don't understand how to work out rate though

anyone wanna explain? Please

look you're not making any sense/ Work out the rate of what?
and well my teacher said it is very likely we will have to be able to calculate standard deviation. You also realise this empa is on the heart, right?

[Tullia]

(Original post by dongonaeatu)
You also realise this empa is on the heart, right?

Are they referring to the ISA or the EMPA?

[dongonaeatu]

(Original post by Tullia)
Are they referring to the ISA or the EMPA?

Well she has said isa, but she isnt making it clear at all. She hasnt said which exami board she is on, what the isa is etc.

[Doctor.]

(Original post by dongonaeatu)
Well she has said isa, but she isnt making it clear at all. She hasnt said which exami board she is on, what the isa is etc.

ISA, It's in the title. Examining bored, it's in the title on the forum (AQA).
The rate, it's not really explained in any text book for biology. I know the Mathematical version of rate, but in relation to time (I think) for this ISA. It's on Osmosis I believe, which leads me to think about "Rate of Osmosis" & mean possibly etc

Are they referring to the ISA or the EMPA?

ISA. I don't do the EMPA

look you're not making any sense/ Work out the rate of what?
and well my teacher said it is very likely we will have to be able to calculate standard deviation. You also realise this empa is on the heart, right?

It's the ISA I am talking about.

[Tullia]

(Original post by Doctor.)
x

I know you're doing the ISA for AQA, and I've done both AS-level ISAs and can confirm that the rate of reaction isn't required.

Good luck!

[Doctor.]

(Original post by Tullia)
I know you're doing the ISA for AQA, and I've done both AS-level ISAs and can confirm that the rate of reaction isn't required.

Good luck!

As per usual, you're awesome!

[Doctor.]

(Original post by Tullia)
I know you're doing the ISA for AQA, and I've done both AS-level ISAs and can confirm that the rate of reaction isn't required.

Good luck!

Just wondering if there was the need to calculate the rate of osmosis, is it just 1/time? and units being "s^-1" :P

Been trying to work it out for a while, will feel annoyed at myself if I have wasted an hour trying to figure it out

[Doctor.]

Anyone?

[jojo7866]

any help with the HUMAN biology isa graph ?

[Tullia]

(Original post by Doctor.)
Anyone?

Sorry, I saw your first reply but not the second reply.

No, you don't need to calculate the rate of reaction as it isn't explicitly asked for in the instructions you're given for the ISA.

Although, I do know that some people did do the rate of reaction as an additional measure and then plotted the graph for the rate of reaction rather than just the time taken in seconds. They weren't penalised for doing this, and neither would be, so long as it is labelled and titled appropriately.

[Doctor.]

(Original post by Tullia)
Sorry, I saw your first reply but not the second reply.

No, you don't need to calculate the rate of reaction as it isn't explicitly asked for in the instructions you're given for the ISA.

Although, I do know that some people did do the rate of reaction as an additional measure and then plotted the graph for the rate of reaction rather than just the time taken in seconds. They weren't penalised for doing this, and neither would be, so long as it is labelled and titled appropriately.

Ah thats great!

So just to make sure I know what I am doing- to work out the rate of something


(something)/time =Rate

[Tullia]

(Original post by Doctor.)
Ah thats great!

So just to make sure I know what I am doing- to work out the rate of something

(something)/time =Rate

Exactly.

In this particular example, it's 1/time and the units are s^-1. Just as you said yourself in an earlier post (sorry for not confirming that earlier).

[Doctor.]

(Original post by Tullia)
Exactly.

In this particular example, it's 1/time and the units are s^-1. Just as you said yourself in an earlier post (sorry for not confirming that earlier).

Thank you very much, again!

[Doctor.]

I'm back again Sorry!

Table:

Would that be fine? I am not sure where else to put the 'Trial Number' section of the table

[Tullia]

(Original post by Doctor.)
I'm back again Sorry!

Table:

Would that be fine? I am not sure where else to put the 'Trial Number' section of the table

That would be fine. That's actually how I do my tables, expect that it isn't necessary to put the row in where you've put "trial number". You're allowed to just put 1, 2 and 3. It's assumed that they're the repeats.

Edit: Added an attachment showing a mock table.