Here's a great at home or in the classroom science experiment that kids will love because they can eat it to!
If you are looking for more homemade candy recipes then dont forget to visit our Candy Recipes Page
If you really want to capitalize on the learning opportunity here, follow the precooking steps. Otherwise skip right to the home made candy recipe below, or this video on how to make your own rock candy
Why do the sugar crystals form into rock candy in this way?
Two systems are at work here to cause the sugar crystals to form.
First, you have created a supersaturated solution by first heating a saturated sugar solution (a solution in which no more sugar can dissolve at a particular temperature) and then allowing it to cool. A supersaturated solution is unstable - it contains more solute (in this case, sugar) than can stay in a liquid form - so the sugar will come out of solution, forming what's called a precipitate. This method is called precipitation.
The other is evaporation - as time passes, the water will evaporate slowly from the solution. As the water evaporates, the solution becomes more saturated and sugar molecules will continue to come out of the solution and collect on the seed crystals on the string. The rock candy crystals grow molecule by molecule. Your finished homemade rock candy will be made up of about a quadrillion (1,000,000,000,000,000) molecules attached to the string.
In most states students are expected to have an understanding of these words and concepts by fourth grade.
Supersaturated, Solute. Evaporate, Evaporation, Precipitate, Precipitation.
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Thelma - Philippines
Going to use these ideas for teaching next year...thank so much guys!
Louise - US
I love these great ideas! Thank you for sharing with us.
Ana - Canada
Great ideas, I am going to use two of these recipes tomorrow! The boys will luv them!
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