by Ninaroja » March 31st, 2014, 6:04 pm
Today was going fine until 2 hours ago.
As part of my chemistry A level I have to do 3 different types of practical task, and I have 3 goes at each one. I've not been doing so well in these this year like I was last year, and today was my 3rd and final chance at one of the types of task (quantitative, if anyone is interested)
Knowing the mark I was sitting on wasn't high enough to get the grade I needed, I made sure I was 100% ready for this one, which I was. I revised how to do all the calculations I needed to do and read all the pages of the textbook that my teacher told me to.
I get into the practical, and you had to carry out an experiment once as a trial run and then at least twice more for your accurate values to calculate an average. The task was very long and tedious, and when I was half way through the first of the accurate tries I knocked the entire thing over (basically getting hot acid everywhere, all over the desk and my stuff and my calculator (and on myself though I was able to quickly wash it off) ) I then had to clean the whole thing up, copy the things I had already written down into a new copy of the exam and then start all over making this solution and then doing the second half of the experiment.
When I finally get set up again, I am doing a titration from this burette, when I realise that there wasn't enough solution in it from the last one I messed up to finish this one, so in that case you are supposed to stop what you are doing and fill it back up. However, I then realised that I had used to much and gone past where the end of the scale stops, so I have no idea how much I have filled in order to add on to my value. In the end I had to estimate it, further skewing the results.
I get to the point where I have done two "accurate" tries, but they aren't close enough in accuracy (within 0.1 of eachother) to get any marks for calculating the average. At this point there isn't enough time to do another, so I just have to roll with it and get to the calculations based on my results.
I knew exactly how to do every question except for the first one , which unless you had the answer to it you couldn't do any of the others. In all the revision I had done from the text book and all the pages I had read grams/dm3 hadn't come up once. I get home, look it up, and realise that one of the things I had in my panic knowing I only had 5 minutes max left written down and then crossed out was the right one.
It was really important and I can't get over the fact that had I not knocked everything over and not suffered losing such a big chunk of time I might have been in less of a panic and been able to think my way through the calculations things wouldn't be as bad.