Felt rather positive about Chemistry this year as I've finally managed to conduct a successful titration!
By successful, I mean being able to get results which are a difference of 0.1 from one another.
I know this is basic,
but last year,
my results were a minimum of 1.0 away so HEY, GREAT IMPROVEMENT GIRL!
Well I've been practising questions from Tutorial 1 the whole morning,
and suddenly don't feel so positive anymore.
"Mole concepts" was the topic I have always felt most confident of,
because my Chemistry tutor has drilled the concepts into me really thoroughly,
but I feel so insecure and lost while doing mole concept questions now.
Well, I guess I'm just a teeny-weeny-as-little-as-an-atom rusty?
Nothing like good ol' practices to get my head in tune again, right?!
Oh yes!!!!!
There was this question on percentage error in our practical worksheet which I had no idea how to do.
I think my answer was 14600% or some ridiculous answer along that line,
and got Ashleigh all cracked up -.-
So, I've googled the method to calculate percentage error! :D
Calculating Percentage Error
It is your estimate minus the true value divided by the true value and multiplied by 100.
So, % error = (estimate - actual) / actual * 100, in absolute value.
For example, if you estimate that there are 90 jelly beans in a jar when there are actually 130 your percentage error is:
(90-130)/130 * 100 = -40/130 * 100 = -0.308*100 = -30.8%
After absolute value, the answer is simply 30.769, or 30.8%.
Have a nice whatever's-left-of-the-weekends guys!
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