![]() Find out by watching this video.Trending Questions How does paramecium get its oxygen? Why are freezies poisonous? What is the chemical name of the RbI compound? Can you break pure gold? Why is the oven used in laboratory? For what is coal mainly used? Phosphorus acid triiodide is formed from its elements? What is an acid an alkali and neutral? How is the term catalyst related to the term enzymes? What is the balanced chemical equation for Ca and H2O? Is ethylene glycol expensive? How can you hide marijuana from being detected in saliva? What is the number of oxygen atoms in 4Co? How many protons neutrons and electrons will positive two ion of calcium have? How easily can dry erase markers wash out of clothes? What Is The Volume Of 0.1 NHCl Required To React Completely With 1. This TED-Ed video (4:29 min.) by Stephanie Warren asks if you have ever wondered what’s really going on when your cookies are in the oven. This video (3:50 min.) from Crash Course Kids, aimed at middle school students, explores the chemical changes involved in cooking some of our favourite foods. In this article from Let’s Talk Science, learn about the techniques used to prepare safe and high-quality food for use on the International Space Station. In this article for Let’s Talk Science, Claire puts her knowledge of chemistry to work every day, testing spices and other cooking ingredients for quality and safety. In this article for Let’s Talk Science, Tammy develops recipes for new ice cream flavours! She uses a lot of math, chemistry and creative skills to produce safe and delicious treats for people across Canada. Tammy Barrett: Manager, Research and Development 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. ![]() Chemical changes are changes that occur in the chemical. Like, turning of water into ice is an example of reversible changes but growth in height is an irreversible change. Physical changes may or may not be reversible changes. Inside each bubble is a little bit of a gas. Physical changes are changes that occur in the physical properties of the substance, like shape, size, and nature. 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. 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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