BCScience great 2 (June 2016)2Big Idea: Materials can be adjusted through physical and also chemical processes.

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NTK-6 scientific research and an innovation Curriculum (NWT, 2004)5Matter and Materials: nature of and Changes in Matter
NUK-6 scientific research and modern technology Curriculum (NWT, 2004)5Matter and also Materials: properties of and also Changes in Matter
YTScience great 2 (British Columbia, June 2016)2Big Idea: Materials deserve to be changed through physical and chemical processes.
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How execute you go from flour, sugar, and eggs to cookies? Or indigenous fruit juice to popsicles? make food is all around changes! These deserve to be physical changes or chemical changes.

Physical Changes

A physical change is a readjust in the state the matter. There are three key states of matter - solid, liquid and also gas.

If you freeze fruit juice to make a popsicle, this is a readjust in state. The juice transforms from a fluid to a solid. Ice cream melting on a hot day is also a readjust in state. The ice cream cream changes from a solid to a liquid. The juice and ice cream space still juice and ice cream, also when they change from one state of matter to another.

Misconception Alert

Sometimes once you cook a fluid it becomes a solid, like as soon as a life egg i do not care a scrambled egg. This is not a change in state. Alters in state have the right to usually it is in reversed. Friend can’t change scrambled eggs back into life eggs!

If you break something large into smaller sized pieces, this is also a physics change. Once you grate a item of cheese for her pizza, you are an altering the block the cheese. The cheese is still cheese, also though the tiny shreds don’t look choose the block of cheese you began with.


Left to right: Frozen fruit treats, melting ice cream and also grated cheese (Sources: LauriPatterson via iStockphoto, Collin BH via iStockphoto and also (sergio_kumer via iStockphoto).


Sometimes physical transforms are hard to see. If you put some sugar into water and stir, quickly you wouldn’t have the ability to see the sugar. It hasn’t disappeared! The sugar has just been broken down right into pieces that room too tiny to see. 

It’s like if you combined a few red candies into a large bag the blue candies. The red candies can be difficult to see, but they’re tho there. 

Chemical Changes

chemical change is a change in what miscellaneous is make of. We have the right to tell that a chemical change has happened by looking for specific clues. 

One clue is gas. Gas is created during a chemistry change. The following time you roasted a cake or flip a pancake, look for the bubbles. Inside each balloon is a tiny bit of a gas. This gas is made as soon as the ingredients change each other. 

Bubbles assist make the food you bake fluffy. If you reduced into a cake, you can see the spaces whereby there were bubbles that gas in the wet batter.

Misconception Alert

Not every bubbles come from chemical changes. As soon as you mix batter with a whisk, you might see bubbles. These are just air the gets trapped in the batter during whisking.

Speaking of gas… smell is the second clue the a chemical change is happening. Cake milk, rotten bananas and mouldy cheese all make smells. These smells warn us not to eat this food. Food that’s rotten or mouldy can make united state sick. 

But there are countless smelly foodstuffs that are perfectly for sure to eat! Blue cheese and Durian fruit have very solid smells. They will not injury you uneven you are allergic to them. Everyone has different tastes. Lots of civilization love foodstuffs with unique odours. 

Did friend know?

Some world say Durian fruit smells like paint thinner and also onions, with a note of stinky gym socks!

Can friend think of pretty smells that could come native the kitchen? The smell of baking bread or roasting turkey are indications that chemical changes are happening!


From left come right: world smelling fresh bread, roast turkey and also simmering soup (Sources: gpointstudio via iStockphoto, FG profession via iStockphoto and eclipse_images via iStockphoto).


The third clue is a change in colour. Think the the perfect gold brown girlfriend can obtain when friend toast marshmallows over a fire. Or the dark brown colour when you accidentally burn it. Whoops! 

When tomatoes adjust colour from environment-friendly to red, that method they are all set to eat. Once bananas readjust from yellow come black, that method they are not good to eat anymore.


Toasted marshmallows, scorched toast and overripe, ripe and under ripe bananas (Elenathewise via iStockphoto, ImageDB via iStockphoto and kolesnikovserg via iStockphoto).


Colour adjust can it is in a tricky clue. Sometimes it’s tough to phone call if a adjust in color is because of a physical adjust or a chemistry change. 

Imagine the you add red food colouring come white icing. Currently you have pink icing. Execute you think this is a physical adjust or a chemical change? remember stirring sugar in water? Food colouring functions the same way. The colour just spreads v the icing. That doesn’t change the icing itself. This is a physics change.

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So how deserve to you phone call if a change is physics or chemical? ask yourself:

Is the problem the very same thing currently as that was before the change? If that the same, the is a physics change. If the isn’t, that is a chemical change.Was over there a readjust in colour or smell? to be a gas formed? If any kind of of these points happened, it to be a chemical change.Can the adjust be reversed easily? If so, it was a physics change.

Your kitchen have the right to be an impressive laboratory to explore the people of chemistry!