![]() Chemical ChangesĪ chemical change is a change in what something is made of. The red candies might be hard to see, but they’re still there. It’s like if you mixed a few red candies into a big bag of blue candies. It hasn’t disappeared! The sugar has just been broken down into pieces that are too small to see. If you put some sugar into water and stir, soon you wouldn’t be able to see the sugar. Sometimes physical changes are hard to see. Left to right: Frozen fruit treats, melting ice cream and grated cheese (Sources: LauriPatterson via iStockphoto, Collin BH via iStockphoto and ( sergio_kumer via iStockphoto). The cheese is still cheese, even though the little shreds don’t look like the block of cheese you started with. When you grate a piece of cheese for your pizza, you are changing the block of cheese. If you break something large into smaller pieces, this is also a physical change. You can’t change scrambled eggs back into raw eggs! Changes in state can usually be reversed. Sometimes when you cook a liquid it becomes a solid, like when a raw egg becomes a scrambled egg. The juice and ice cream are still juice and ice cream, even when they change from one state of matter to another. The ice cream changes from a solid to a liquid. ![]() Ice cream melting on a hot day is also a change in state. The juice changes from a liquid to a solid. ![]() If you freeze fruit juice to make a popsicle, this is a change in state. There are three main states of matter - solid, liquid and gas. Physical ChangesĪ physical change is a change in the state of matter. How do you go from flour, sugar, and eggs to cookies? Or from fruit juice to popsicles? Making food is all about changes! These can be physical changes or chemical changes. Open Professional Learning × Close Professional Learning Open Educational Resources × Close Educational Resources
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