The Three Best Posts So Far (SA1 Assignment)

This is to Mdm Riza, so she would evaluate my work and grade me according to her rubrics (Actually, I never really read the rubrics, but okay).

My 3 (and only) posts I've selected for this assignment:

Diffusion Lesson

Acids and Alkalis Lesson

Osmosis Lesson... (I think it's both diffusion and osmosis)

Hopefully, this would get me a pass...

That's all, Thanks :)

Osmosis?(SA1 Post 3)

It's getting harder to remember now. Wish I had a water from NEWater...

Oh yeah, that reminds me, osmosis. What is osmosis you ask? Osmosis is the process of soluble substances passing through a semi-permeable membrane... I think. Well. I did learn much from the experiment I did on the day we were learning about osmosis.

Our teacher taught us an experiment. We took a visking tubing (It's some kind of semi-permeable tube that is used for various reason I will never know...), rinse it with water to get rid of any foreign material that would contaminate the it, fill it with a starch solution, I think... tied it to prevent leaking, and lower it down to a beaker of iodine. In the middle of all of this our teacher showed us the end result, a purple visking tubing was observed. Not much was found in our experiment since the visking tubing's top wasn't tied very well and the starch solution and iodine solution started mixing. Then it happened to other people. Some luck our class has. But anyway, this it the best I could remember so far.

Acid Galore! (SA1 Post 2)

Here's another lesson in which we did various of experiments that left me astonished.

My first thoughts of Acids were that it can corrode, eat through things, but that was not the case after this lesson. In that lesson, I learnt different types of acids. I know one that's in our stomachs, which is Hydrochloric Acid. It was so corrosive, after some personal research, I found out it could eat through zinc!

But I mostly remembered the experiments, where we were told to fill up test tubes with 2, I think, or just 1? Anyway, we filled up test tubes with dilute acid. And in each of these test tubes, we have to place in one type of metal, I remembered one of them was... Zinc? And these metals reacted, a lot. I tried placing my thumb over it and tried to push my thumb off, indicating a gas was produced. Mdm Riza told me it was hydrogen and to test it out we had to lower a lighted splint into the test tube. We did. The result was a small, tiny... explosion (Don't worry, no harm done.) with a soft 'poof'. I felt contented (and so was Yi Heng) that our mini explosion was very loud, that the tables in front could hear.

Oh, and I also remembered a experiment about testing for carbon dioxide with limewater in a reaction. We just reacted some metals with some acids and used a pipe to direct the gas produce to limewater. White precipitate was produced in the limewater, indicating Carbon Dioxide.

Overall, the lesson was fun and exciting. And very detailed to (Even though I remembered some part of the second experiment, sorry about that...)

Diffusion (SA1 Post 1)

Here's one lesson we had in one of our science lessons.

If I'm right, we had an experiment of testing out diffusion, and... um, I think it was potassium permanganate (Pardon me for my short memory), with the relief teacher while Mdm Riza was not in for a while. We we're told to drop a tiny amount of the potassium permanganate in a beaker of water and, not stir, but observer instead. Me and my partner, Yi Heng were noticing a very slow change in this process of the experiment. The potassium permanganate has given off a purple colour, but we're not focusing on that, what we're focusing on is that the colour began to spread into the colourless areas of the beaker and soon, it engulfed everything in a purple dye, making purple water, or, purple potassium permanganate solution. The teacher describes this process as diffusion, not an everyday word, but an everyday occurrence, like sugar dissolving in water without stirring.

After that, the teacher passed around a test tube with some colourless, soft, jelly (or the folks here in Singapore call it, Agar-agar, I think) and a... um.. let's see... I think... I think it's a Copper(II) Sulfate crystal in it. It's blue in colour and it seems that it's colour is diffusing into the jelly, or 'Agar agar', which is really quite interesting. I used to think that diffusion only happens in liquids and gases (In terms of gases, perfume diffusing in the air) but it happens in solids too.

We were given notes to learn more about these experiments and how do they work...

Hello Everyone! (And some apologises)

Unfortunately, my previous blog became unaccessible to me. Now I can't view my posts (I know right, wrong time for my blog to corrupt like that). Now, I'm in the midst of a SA1 assignment, posting 3 best blog posts to my teacher (which she would be reading now), and I left my blog posts back at the old blog. So now, I'm going to to do it with memory (Hopefully it would work out).