Hello readers today I am doing an assessment
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Conduction-
The experiment we did for conduction was heating the end of a metal rod and letting the fire spread its thermal energy to the next particle which eventually made the sticky slime that was holding the pins melt and proceeded to make the next pin drop. The key learning for this experiment was to make us realise what conduction was and that some materials are better conductors than other materials.
Contraction-
For this experiment we put a little bit of water in a can and boiled the water in the can We then flipped the can really fast into a bowl of cold water making the can have no particles or anything in the gap with no water which made the can contract and get smaller at a rapid rate. The key learning for this experiment was for us to know what contraction is and so that we know that particles vibrate faster and closer together when thermal energy taken away causing solids gasses and liquids to contract.
Diffusion-
For the diffusion experiment we put a skittle in cold water and watched it spread out and then did it in hot water and timed the difference speeds that the little colour melted. The key learning was for us to learn is that diffusion is when particles spread out and take up as much space as possible making it completely full of particles.
Convection-
The experiment that we did for convection was to drop potassium permanganate down a straw into boiling water and watch the crystals purple trace go around to the top and down to the bottom again and again making a tornado effect. The key learning was to make sure that we knew that when areas with more thermal energy in their particles will rise while areas with less thermal energy will fall
My favourite experiment of the four was the contraction one because I was the one that got allowed to flip the can into the cold water
Here is the experiment write up for contraction.
LEGEND – Contraction
| Section | Your writeup |
| Title – Your title should tell readers about your experiment | Can this expand or will it contract |
| What is Contraction? | Find or draw a picture that shows the process of contraction and put it here:
Contraction is when there is no particles at all so the can or whatever you are using is going to get smaller at a fast rate |
| Aim | The aim of this experiment was to show how contraction works |
| Hypothesis – What do you expect might happen? | During this experiment, I predicted that the can would contract really fast when put into the cold water |
| Equipment – What equipment did we use? | The equipment I used was:
|
| Method – What steps did you follow to complete this experiment? | The step-by-step method for my experiment is as follows:
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| Results
With your group, make observations about what happens to the water as it is heated, and how the aluminium can reacts to being put in cold water |
During the experiment I observed that:
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| Discussion
Using the word list below, explain why plunging the steam-filled can into cold water caused it to implode:
List two ways you would like to improve your experiment if you did it again. |
As steam, the water particles in the can form a space where there are no particles at all which makes the gas leave as quickly as possible and creates air pressure which makes it contract
I think I could make my experiment better by:
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| Conclusion
Finish this sentence to conclude your science report. |
My results supported/did not support (highlight one) my hypothesis because my results showed that the second that the can touched the cold water it contracted |
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