Totally-enlightened Tuesday

I was so enlightened (albeit sleepy) during Chemistry lecture today!

So, there actually are reasons behind the usage of different indicator solutions!

Laugh if you need to,

but I've never really believed that there was a huge difference among the indicator solutions.

Yes I have suspected, but I haven't really given that much thought.

In fact, I've always thought that the teachers made us use different indicators so as to expose us to more varieties of indicators -.-

Accomplished.

Enlightened.

Instant addition of intelligence.

Next, I shall show off my knowledge to my little brother in year3, hoho!

P.S. Aiming to complete all the examples 'til eg. 28 in case Mrs. Phua intends to go through them during tutorial session tomorrow

Self-study Sunday

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!

Today I have once again been reminded of a fact which I have always found hard to accept:

look mrs. phua, i do take notes!

1 mole of CH4 has not 1/5, but ONE mole of carbon atoms,

while 1 mole of C2H4 has not 1/6, but TWO moles of carbon atoms.

I found it really difficult to accept because in math,

we have been taught that when you divide 1 by 5,

you get 1/5 and not 1!

OKAY I HAVE TO STOP FLIPPING THAT IDEA IN MY HEAD AS IF I WERE FLIPPING A COIN OR I'LD GET ALL CONFUSED AGAIN :S

In the next hour Imma memorise the following formula because my sixth sense has detected its importance:

CxHy + (x + y/4) O2 ----> x CO2 + (Y/2) H20

Yes I know it can be worked out but I am a memory person thank you very much.

Hello beautiful stranger

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