![]() ![]() Add your toppings and it should look something like this. Teacher: You need to shake it for about five minutes and, once you're ready, remove the small bag and put the ice cream into a bowl or cone. So, how long do you need to keep doing that? The water in the milk changes state and turns from a liquid into a solid, turning it into delicious ice cream. Teacher: The addition of the salt has made the ice a few degrees below freezing. Presenter: Yeah, it's getting a little thicker. ![]() Can you see what's happening to the ingredients? Presenter: Oh, important question! Very important. Put on some gloves so your hands don't get too cold. It melts the ice, making it safe to drive or walk on.Ĭarefully place the small zip lock bag inside the large bag with the ice and salt and seal it all up nice and tight. You can see this science in action when salt is spread on roads and pavements in freezing weather. In this Review, we introduce azobenzene compounds that exhibit photoinduced reversible solid-to-liquid transitions, discuss the mechanisms and design principles, and show their potential applications in healable coatings, adhesives, transfer printing, lithography, actuators, fuels, and gas separation. Teacher: The salt lowers the freezing point of the ice and, if you look closely, you will see the ice begin to melt. Presenter: Why do you do that? Salt, ice cream. I filled a large zip lock bag with ice and food colouring so you can see it better at home. To make your very own instant ice cream at home we will need a large and small zip lock bag, ice cubes, salt, your favourite flavoured milk, a bowl or cone, warm gloves and, if you want, some toppings.įirst, I poured half a cup of flavoured milk into the small zip lock bag and sealed it tight. Video Transcript Solids, liquids and gases. Presenter: Whoa! Hang on, actual edible ice cream that is fully frozen without a freezer? particles are arranged in solids, liquids and gases. Teacher: Will it impress you even more if I said we will be making ice cream without a freezer? Presenter: This is already the best chemistry class I've ever been in. Teacher: I come armed with everything we need to have a tasty chemistry lesson.
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