Refer to the Infographic Creator learning strategy.
Concepts introduced include state of matter, chemical change, gas, bubbles, smell and colour. This article supports teaching and learning of chemistry related to change in matter.Some people say Durian fruit smells like paint thinner and onions, with a hint of stinky gym socks!Ĭan you think of nice smells that might come from the kitchen? The smell of baking bread or roasting turkey are signs that chemical changes are happening! Lots of people love foods with unique odours. They will not harm you unless you are allergic to them. Food that’s rotten or mouldy could make us sick.īut there are many smelly foods that are perfectly safe to eat! Blue cheese and Durian fruit have very strong smells. These smells warn us not to eat this food. Sour milk, rotten bananas and mouldy cheese all make smells. Speaking of gas… Smell is the second clue that a chemical change is happening. These are just air that gets trapped in the batter during whisking. When you mix batter with a whisk, you might see bubbles. Not all bubbles come from chemical changes. If you cut into a cake, you can see the spaces where there were bubbles of gas in the wet batter. This gas is made when the ingredients change each other.īubbles help make the food you bake fluffy. Inside each bubble is a little bit of a gas. The next time you bake a cake or flip a pancake, look for the bubbles. Gas is produced during a chemical change. We can tell that a chemical change has happened by looking for certain clues. 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.
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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.
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