For today’s lesson we did biology, I was very excited, as I have not done a bio experiment before. In this blog post I will be telling you what experiment we did and some things I learnt.
Experiment 1: Egg Ping Pong and Rubber Bones
In this Experiment, we dip a boiled egg in to vinegar and in the end the boiled became rubbery after 4 hours. This reason is that eggshell made of calcium carbonate and vinegar is an ethonaic acid hence when they react with each other, it will produce salt water and carbon dioxide and the shell will dissolve causing the egg to be surrounded with a layer of membrane that made the egg rubbery and bouncy.
After we had done this experiment the trainer showed us a rubbery bone he said that it become like this after having soak in vinegar is because the bone contain calcium hence the bone will react like the egg.
Experiment 2: Fizzy Yeast
In this experiment, we mix yeast with sugar then pour it into a conical flask. After that we put a balloon over the tip of the conical flask. After an hour the balloon was inflated. The explanation to this is:
Yeast is a microscopic form of fungus, it is related to mushrooms. Like us it will eat sugars and react them with oxygen from the air to form water and carbon dioxide.
However this would not explain the increase in the volume of gas in the bottle. This is because if you react with a sugar such as glucose with oxygen you form as much carbon dioxide as the oxygen so there would be no increase in volume and the balloon would not inflate.
However yeast has another trick up its sleeve. If there is lots of food about in the form of sugar but not enough oxygen, the yeast can generate energy by breaking down the sugar into ethanol and carbon dioxide.
Experiment 3: DIY toothpaste
In the experiment, we used glycerin, table salt and baking soda to make an artificial toothpaste, I learnt that toothpaste contains many trace of chemicals that may be toxic when ingested hence toothpaste cannot be swallowed. If consume…
Experiment 4: Jelly Science
In this experiment our aim is to investigate the effect of different fruits on the setting of jelly. When making the jelly one of the fruits we put in is pineapple this let us observe that strangely that the jelly with pineapple could not solidify. Here is the reason:
As jelly is made up long thin protein molecules. The reasons that jelly sets is that as the gelatin molecules tangle up as they cool which traps water making a flexible solid. However pineapple contains enzymes known as acteniden that will “cut” the protein molecules hence the jelly could not harden.
Experiment 5: DNA of kiwi
In this experiment we first crush the kiwi slices and then mix it with DNA extraction solution to extract the DNA of kiwi lastly we put the mixture in to a machine that will heat the mixture for 15 minutes.
After 15 minutes, we pour the mixture into attest tube then we add ice cold ethanol in to the mixture slowly we can see the DNA separating from the mixture.
Experiment 6: Sticky Milky
In this experiment, we used skim milk and vinegar we mix both well then we filter the mixture. The residue is the solid curds. We took the curds and mix it with baking soda with a little water. Lastly you obtain your sticky “glue”.
This happen because when vinegar is added to the milk, the milk undergo polymerization causing the milk to become more and more sticky.
No comments:
Post a Comment