Hi, this week, I'll introduce the topic Matter. Below are some of the experiments i had done in class :
a) To show air has mass ------------->
- This experiment is supposed to use a rod to balance the both balloons.
- However, I changed to use metre rule instead. Without the disturbance of fan, surely the balancing is easier to obtain.
a) Diffusion of solid ------------->
I put Potassium Manganate (VII) on top of a jelly.You can observe that the purple colour will diffuse very slowly.The below results that I get is actually being done for 4 hours. Visibly, it is very much clear that in a solid matter, the diffusion process is very slow. In order for the whole jelly to become purple colour, it'll need couple of days.
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| On Side View |
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| On Top View |
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After 4 hours
b) Diffusion of liquid ------------->
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| Failed experiment |
In this experiment, I use Copper (II) Sulphate to diffuse into the water.
However, this is a failed experiment because byright, we need to dissolve the solidify state of copper (II) sulphate first until a concentrated solution is formed, then transfer the solution to a beaker half filled with water. Then, waited for the diffusion to happen.
Below is the successful experiment I had done using concentrated potassium manganate (VII) solution and thisthle funnel.
3.3 The Concept of Density
Calculation of a density of a substance :
Below shows the experiments I'd done in the class to show density :
a) Egg Density Experiment
In order for this experiment to succeed, the eggs must be fresh, or else, there is air trapped inside the egg shell that enables it to float no matter what.- Next, mix a mixture of 4 tablespoons of salt in water.(p/s : you can try and drop in the egg to see whether it'll float already).
- Then, pour half of the concentrated salt solution into second beaker. Add in half of the amount of water. Drop in the egg, it'll float in the middle.
- The 3rd beaker solution is totally from concentrated salt.
b) Clay Boat Experiment - Make a clay boat and a clump of clay. Make sure there is no hole and the water cannot enter the boat when you put in on water.
- When you put in on water, it is notice that the boat will float.
- On the other hand, the clump of clay will sink because it is denser.
Since i cannot make my own submarine, I found this submarine animation as a substitute.
Below is an exercise to test your understanding level: Good luck :>
