Naomi showed an a demonstration of dissolving a solid in liquid which creates a gas at the same time. The vitamin C tablet was fizzing and bubbling while dissolving. The change was irreversible because we couldn’t get the solid out of the liquid again after it had dissolved. Ian brought in an icepack which has gel inside. We had it out for an hour in the classroom and it barely melted so we thought gel must take a lot longer than water to melt. Imran brought in some pepper to explain about the density of different substances. He got us to put pepper on a plate of water and tough it with our fingers. Nothing happened. Next Imran got us to put soap on our finger and try again...this time the pepper dispersed to the edge of the plate!
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May 2021
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