Science eureka

On the day before a test had to be taken for science eureka, one of the experiments was on light refraction, where by if a ray of light hits the water at a certain degree, and as the water is not fully transparent, it will be refracted at a certain angle. Thus we did a few experiments on it. One was to put a paper clip into a cup, and put a paper clip away from you in the cup. Then our partner would move the cup forward, so that the paper clip cannot be seen. After that, he/she will slowly move the cup till you could see it. We did it another time but this time with water, but this time the cup had to be moved in more before the paper clip could be seen.
Then we did an experiment where by we first filled a transparent tank with water, then shined a light onto it, and noted where was the most concecntration of the light was. Then we added some milk into it, and the centre of concentration of light was changed alot, and this was due to the refraction of light.

Science eureka

We also learned how to make our own electricity by using copper and zinc in acid solution. We were told to connect the meters onto the strips of metals that were in a beaker of acidic solution, and try all the different combinations of metal together, electiricty was produced, but the readings were all different.. Then were told to choose the two metals that generated the greatest difference of electricity, which were the copper which was - and the zinc which was a +. Then we connected the crococdile clips to both of them and put them back into the beaker of acidic solution, then we connected it to a led light bulb, and the light bulb glowed.

Science euereka

On the second and the following dayof my sabbatical we did chemistry. We did some really interesting experiments that allowed me to learn many more new things. We learned about ph where by ph7 is for water, 7 > is for alkaline, and < 7 is for acids.
We also did an interesting experiment about vitamin C, whereby we tested heated fruit juices with no heated ones. The results were that the no heated ones had more Vit. C then the heated ones. So the conclusion is to be able to gain more benefits from drinking fruit juices, do not heat them.

hot ice part 2

Then after that, I poured it into a container already containing some vinegar, so as to react the remaining sodium bicarobonate, to ensure it is pure. Then I put it into the fridge for about 30 minutes before checking again. I used bits of solid sodium acetate trihydrate that was left behind after the heating and dropped it into the solution.

I did this few steps for many times, but it all failed. Then I changed it into using a ice water bath to cool it, but it still failed. Then, I used some fo the solid sodium acetate trihydrate that had been frozen and dropped it into the solution and it worked! So I found out that the best way to allow the experiment to work was to use the ice water bath and also use frozen bits for sodium acetate trihydrate.

Term 3 test reflections

My term 3 test was not as good as my first two terms, as I got 26 of 40 and it was a b3. Through this test, I learnt from many of my mistake. One was that it was the filter the miture not filtrate the mixture. Also I learned not to be over arrogant and always talk and not study science.

Hot ice experiment

I did this experiment for my ace, and the objectives were to find out if this was true or false, better ways to do it and to find out why does this happen. "hot ice" is a term for sodium acetate trihydrate, turning form the liquid form to the solid form. Sodium acetate trihydrate is a product from the chemical reaction of vinegar(acetic acid) and baking soda (sodium bicarbonate). During this chemical reaction, carbonic acid is formed and so is sodium acetate, but the carbonic acetate quickly decomposes into carbon dioxide and water, and thus while mixing it, we will get a dilute sodium acetate trihydrate(solution of sodium acetate and water). Thus to get saturated sodium acetate trihydrate, we must evaporat off the water. I evaporated it to about 10%

Science Eureka

In the second term of school, I took the Science Eureka sabbatical. On the first day of the sabbatical, we conducted physics experiments. One of the experiment was to make the best parachute for the egg to float for the longest time from the third storey. My group and I debated on whether to have a stronger parachute which would have more newspaper on a single area, or to make it as large of an area as possible. We chose to make its area as large as possible. When we threw the egg down, the egg with the cover broke from the newspaper and straight away dropped onto the ground. The egg cracked, and the experiment was a failure. We should have made the newspaper parachute stronger by adding more newspaper to a single area.

We also did an experiment on pressure whereby we heated a normal sized empty can, with a Bunsen burner. We then inverted the top where the opening was and put it into an ice bath. What happened next was very interesting as the can seemed to be crushed. The tutors then explained that it was due to the difference in pressure inside the can and the atmospheric pressure. When we heated the can, the molecules in the air became further spaced as they had more kinetic enery. There was very little air molecules in the can, thus when the can was inverted and put into the ice bath, it rapidly cooled, and decreased the space taken by the air molecules and as the water was not fast enough to feel the empty space, the difference between the pressure of the atmosphere and the can cause the can to be crushed as to be enough space for the air to occupy.