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You are watching: Is ice cream a physical or chemical change


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Directions:

Step 1:

Fill the gallon-size plastic food storage bag halfway with ice, and add the absent salt to the ice. Seal the bag so that doesn’t pour out while girlfriend prepare the ice cream ingredients.

Tip: You deserve to add much more than one bag of ice cream to the bag of ice and shake them in ~ the same time. If you carry out make more than one bag, you can use a Sharpie to brand the bags of ice cream cream to tell lock apart.


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Step 2:

Add the milk and sugar to the pint-size plastic food storage bag. Optional: add cocoa powder to the pint-size bag come make chocolate ice cream. (Add the vanilla come the pint-size bag, even coco ice cream has actually a tiny vanilla in it!)

Squeeze the overabundance air the end of the pint-size bag and seal it, and also tape the seal shut through duct ice to keep it native spilling. Shake the pint-size bag because that a few seconds come mix the ice cream cream ingredients.

Tip: ½ cup that milk will certainly make about 1 scoop of ice cream cream, so double the cooking recipes if you want more. Yet don"t boost the proportions an ext than that – a huge amount might be too huge for children to pick-up because the ice itself is heavy.


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While you"re making and shaking your ice cream talk around physical and chemical changes and encourage her scientist to answer the following:

What does her ice cream look like?Why do you think the ingredient in the pint-size bag turn to ice cream cream?What do you think the shaking did?Why perform you think we added salt come the ice?What physical or chemical changes did you observe while making her ice cream?What other instances of physics or chemical transforms can you think of?Dive deeper into a science topic with the “Learn More” section.

Step 3:

Open the gallon-size bag and also put the pint-size bag inside it, and also carefully seal the gallon-size bag again. Make sure it is totally shut!

Shake until the mixture in the pint-size bag is ice cream cream, i beg your pardon takes around 5 minutes.

Wipe turn off or to wash the peak of the pint-size bag through cold water to remove any kind of salt, then open up the bag carefully, include any toppings you would certainly like, and also enjoy her ice cream!


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Expand ~ above the activity!


The Science: Physical and also Chemical Changes

We talk about two varieties of alters in chemistry: physical changes and chemical changes. We also talk a lot around matter, i beg your pardon is is anything the takes up space.

In a physical change, the form of matter is changed, while its chemical identity remains the same.

Think around cutting a piece of record into bits. It’s still paper, simply in smaller pieces. Physical changes are additionally reversible. You could tape the document back together! Other instances of physical transforms include boiling, melting, freezing, dissolving, and also mixing.

In a chemistry change, the chemical reaction occurs. The chemical reaction changes the chemical identity of the matter, and brand-new products are formed that friend can’t easily reverse.

Think the a campfire. The fire take away a log and creates ash and smoke, two chemically-distinct products.

There room 5 indications that a chemical reaction has occurred. They’re basic to remember… simply think about F.A.R.T.S.

Fizzes: go the reaction create bubbles or gas?

Aroma: did the reaction produce a smell?

Re-color: did the reaction create a brand-new color?

Temperature: go the reaction develop a temperature readjust or relax light?

New Substance: go the reaction develop a new substance?

When making ice cream, you’re making use of physical changes. Girlfriend mix and dissolve the sugar into the milk, yet this doesn’t adjust the chemical structure of the milk and you could remove the sugar is you tried.

When friend shake her bag, you’re freeze the milk, which means the water in it is turning from a liquid (water) into a heavy (ice). This is likewise a physical change! we still see several physical and also chemical changes in the kitchen. I m sorry ones deserve to you think of?


Learn More: Chemistry

Why execute we shower our ice cream science project rather of just popping the ice cream in the freezer?

Ice cream is an emulsion. In an emulsion, little droplets the one liquid are dispersed (or spread out out) throughout another. Once you shake the ice cream, girlfriend disperse the ice crystals, fat molecules, and air in the other ingredients.

The much more you shake, the smaller sized the ice crystals get and also the an ext air you add. This makes the ice cream creamier! We include salt come the ice cream so we can shake the ice cream cream long enough to emulsify it.

Every substance has actually a melting point, i beg your pardon is the temperature the melts or freezes at. Because that freshwater, the melting temperature is 32ºF/0ºC. Including rock salt lowers the melting suggest of water. A 10% salt systems freezes at about 20ºF/-6ºC.

See more: What Was The Most Likely Reason The Grinch Hated Christmas ?

With a lower melting point, we have the right to shake the ice cream cream longer to better diffuse the various parts. If that froze faster, this would certainly be lot harder come do.