BCScience class 2 (June 2016)2Big Idea: Materials can be changed through physical and chemical processes.

You are watching: An edible example of a physical change

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How carry out you go from flour, sugar, and eggs come cookies? Or native fruit juice to popsicles? making food is all around changes! These can be physical changes or chemical changes.

Physical Changes

A physical adjust is a readjust in the state the matter. There room three main states of issue - solid, liquid and gas.

If you freeze fruit juice to make a popsicle, this is a adjust in state. The juice alters from a liquid to a solid. Ice cream melt on a warm day is likewise a adjust in state. The ice cream cream alters from a solid come a liquid. The juice and ice cream space still juice and also ice cream, also when they readjust from one state of issue to another.

Misconception Alert

Sometimes when you chef a liquid it i do not care a solid, like when a raw egg becomes a scrambled egg. This is no a readjust in state. Alters in state can usually it is in reversed. Girlfriend can’t readjust scrambled eggs back into raw eggs!

If you break something large into smaller sized pieces, this is additionally a physics change. When you grate a piece of cheese for your pizza, you are transforming the block the cheese. The cheese is tho cheese, also though the small shreds don’t look favor the block of cheese you started with.


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


Sometimes physical transforms are tough to see. If you placed some sugar into water and also stir, shortly you wouldn’t be able to see the sugar. It there is no disappeared! The sugar has actually just been damaged down into pieces that are too little to see. 

It’s like if you mixed a few red candies right into a large bag of blue candies. The red candies can be difficult to see, however they’re tho there. 

Chemical Changes

chemical change is a readjust in what something is do of. We deserve to tell the a chemical adjust has occurred by feather for certain clues. 

One reservation is gas. Gas is developed during a chemical change. The following time you bake a cake or upper and lower reversal 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 adjust each other. 

Bubbles aid make the food you roasted fluffy. If you cut into a cake, you deserve to see the spaces where there were bubbles of gas in the wet batter.

Misconception Alert

Not all bubbles come from chemistry changes. Once you mix batter with a whisk, you could see bubbles. This are just air that gets trapped in the batter during whisking.

Speaking of gas… smell is the 2nd clue the a chemical adjust is happening. Cake milk, rotten bananas and also mouldy cheese all make smells. These smells warn us not to eat this food. Food it is rotten or mouldy could make us sick. 

But there are countless smelly foods that space perfectly safe to eat! Blue cheese and Durian fruit have very strong smells. They will not harm you uneven you space allergic come them. Everyone has various tastes. Too many of civilization love foods with distinctive odours. 

Did you know?

Some people say Durian fruit smells like paint thinner and onions, through a hint of stinky gym socks!

Can girlfriend think of pretty smells that could come native the kitchen? The smell of baking bread or roasting turkey are indicators that chemical transforms are happening!


From left to right: world smelling new bread, roast turkey and simmering soup (Sources: gpointstudio via iStockphoto, FG trade via iStockphoto and also eclipse_images via iStockphoto).


The 3rd clue is a change in colour. Think of the perfect gold brown friend can obtain when you toast marshmallows over a fire. Or the dark brown colour when you coincidentally burn it. Whoops! 

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


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


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

Imagine the you include red food colouring to white icing. Currently you have pink icing. Carry out you think this is a physical readjust or a chemistry change? remember stirring sugar in water? Food colouring functions the exact same way. The colour just spreads through the icing. The doesn’t readjust the icing itself. This is a physics change.

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So how have the right to you call if a change is physical or chemical? ask yourself:

Is the problem the same thing currently as it was prior to the change? If that the same, that is a physical change. If it isn’t, it is a chemical change.Was there a change in color or smell? to be a gas formed? If any kind of of these things happened, it to be a chemistry change.Can the readjust be reversed easily? If so, it to be a physical change.

Your kitchen have the right to be an impressive laboratory to discover the civilization of chemistry!