gsce biology ISA on diffusion

i'm doing an isa right now on school on as the concentration of hydlochoric acid increases so does the rate of diffusion
anyone got any tips to get an A star and the hazards involved
thanks any help will be much appreciated

have u done paper 2 if so what was in there

I guess I am not alone on this! I shall too be doing it! I have done paper 1 which asks you for the hypothesis, why you have chosen the hypothesis so mention the affect diffusion has on concentration, a question on method, risk etc. what you hadpve changed in your experiment to make it easier. I am not quite sure how the last question was worded but u need to know how your method was suitable and how u changed it to make it easier.

Paper 2........ ARGH!!!!!! I am doing that on Friday and I too am worried about that!!! Any one help!!! I think the case studies is really the one that is really keeping us biting our nails.....

Paper one is the easier one - I think, anyway. It asks you about you hypothesis (just state it. Make sure it's a decent one), and then asks you why you have decided upon this hypothesis. Explaining a little it of the science behind the hypothesis here will (hopefully) get you the marks. It the asks you to pick out two sources that you used to help you develop this hypothesis (you can take the weblinks in with you on the sheet that you take into the ISA). Here comparison is the key. State why one source was better than the other (more detailed, more relevant to the investigation, better graphics/diagrams) and why the other was worse (wasn't relevant, diagrams were unclear, too complex/simple). It then asks you for a method. Here include your equipment list (including safety goggles, and don't forget anything!), method (as if you were explaining it to a 3 year old. It must be VERY simple so that a child could follow it.), variables (Independent, Dependent and Control - that stuff) and your risk assessment (I find that HRC works well (Hazard - why it's dangerous, Risk - the harm it could cause, and Control - what you will do to prevent this happening. Simple ones like:
Hazard - Acid
Risk - Could splash into my eyes
Control - I will wear safety glasses.
This is one that you could perhaps expand upon/adapt to use)
I believe there is only one more question on that paper, and that is to draw a table. Put sensible headings and DO NOT FORGET UNITS!! They are what gets you the marks.
Consistently good spelling and grammar (and use of scientific keywords - but nothing difficult) throughout will also give you another (I believe it is) 9 marks.
I hope you do well on your paper, and that I have helped!!
Good luck. I apologise sincerely if what I just wrote is not relevant to you at all!

WOW, thanks so much, this is perfect and will really hlep!

how do you measure how far hydrochloric acid has diffused across block???

Paper one is the easier one - I think, anyway. It asks you about you hypothesis (just state it. Make sure it's a decent one), and then asks you why you have decided upon this hypothesis. Explaining a little it of the science behind the hypothesis here will (hopefully) get you the marks. It the asks you to pick out two sources that you used to help you develop this hypothesis (you can take the weblinks in with you on the sheet that you take into the ISA). Here comparison is the key. State why one source was better than the other (more detailed, more relevant to the investigation, better graphics/diagrams) and why the other was worse (wasn't relevant, diagrams were unclear, too complex/simple). It then asks you for a method. Here include your equipment list (including safety goggles, and don't forget anything!), method (as if you were explaining it to a 3 year old. It must be VERY simple so that a child could follow it.), variables (Independent, Dependent and Control - that stuff) and your risk assessment (I find that HRC works well (Hazard - why it's dangerous, Risk - the harm it could cause, and Control - what you will do to prevent this happening. Simple ones like:
Hazard - Acid
Risk - Could splash into my eyes
Control - I will wear safety glasses.
This is one that you could perhaps expand upon/adapt to use)
I believe there is only one more question on that paper, and that is to draw a table. Put sensible headings and DO NOT FORGET UNITS!! They are what gets you the marks.
Consistently good spelling and grammar (and use of scientific keywords - but nothing difficult) throughout will also give you another (I believe it is) 9 marks.
I hope you do well on your paper, and that I have helped!!
Good luck. I apologise sincerely if what I just wrote is not relevant to you at all!