(Original post by m1a1tank)
Im doing AQA. In unit 3 i got a D, for unit 6 i've gotten apparently a B.
The grade boundaries for both Unit 3 and 6 are also very high for ISA's. So don't focus on the grade that you've been given. Focus on the UMS that you've gotten instead.
In AS its either going to be titrations or observation exercises right? I'll give you some tips.
1) First thing you should always do is to rinse your equipment out.
2) Always do a practice run with the experiment so you can see when the colour changes. For example, during your practice run go quite fast and see when the colour changes. If the colour changes say after 17cm^3 is added. Then you know when you do it properly afterwards you can go fast up to around 13/14. Then go slowly after that to make sure you get accurate readings.
3) ALWAYS make sure you have no air bubbles in your burette. If you do and you do the experiment with that. You're pretty much asking for a U.
4) To do well in this use both of your hands. One hand to open and close the burette, the other hand to swirl the contents of your beaker. This is very helpful.
5) Whenever you add something to your burette do it at eye level. If this means moving the clampstand onto a chair or whatever, do it anyway. Always read from eye level and read at the meniscus.
These are usually easier, you get stuff like A, B, C, D and say 3/4 known reagents. You add A to all of them. and do the same with the rest. So that is pretty straight forward right. So whats the hard bit. I'll tell you.
1) When recording observations into your table. You will lose marks if you do not use words that they like. If in the observation something went misty or cloudy. Do NOT
say that. You say a precipitate (or ppt.) was formed. If it went clear, say it turned into a transparent solution.
2) Some marks are often lost from colour changes. If something was green. and it went orange. Don't say that it went orange. Say "The colour changed from green to orange"
3) Always use a separate pipette for every reagent you use. That way you don't risk contaminating any reagents or mixing anything up, this will result in incorrect observations.
4) If you are given three things that you know and something unknown to test. You are 99% likely to be asked to identify what that unknown thing could be in the paper out of a number of things they give you. So whatever observations you got for the thing that is unknown. Research possible things that it could be.
I think that should be able to help you out. PM me if you have any questions.