Rock Candy
There were few things my sister liked better than getting rock candy from the candy store in the mall when she was younger. I never could quite understand the fascination behind the disgustingly sweet candy but whenever she saw those sugary crystals she had to have 'em! While a little bit time consuming, this project is super easy and even a little bit interesting to watch happen! Get started on making it soon and you'll have plenty of time before Christmas rolls around.
You'll Need:
• 4 cups sugar
• 2 cups water
- a small saucepan
- a wooden spoon
- a candy thermometer
- a small, clean glass jar
- a measuring cup
- cotton string
- a weight to hang on the string (such as a screw or galvanized washer)
- waxed paper
- a pencil (to suspend the string in the jar)
-(optinal: food color and flavoring)
Directions:
1. Heat the water in the saucepan over medium-high heat until it comes to a boil.
2. Completely dissolve the sugar in the boiling water, stirring continuously with the wooden spoon until the solution grows clear and it reaches a rolling boil.
3. Remove the solution from the heat, and then carefully pour it into the jar. Cover the jar with a small piece of waxed paper.
4. Tie the weight to one end of the string, and then tie the other end to the middle of the pencil. The string should be about two-thirds as long as the jar is deep. Dip the string into the sugar solution, remove it, lay it on a piece of waxed paper, straighten it out, and let it dry for a few days.
5. Gently suspend the prepared string in the solution and let sit at room temperature, undisturbed, for several days. You can check each day to see how much your crystals have grown. It’s tempting, but don’t touch the jar until the experiment is finished-it usually takes about seven days.
6. At the end of the week, the crystals on your string should be clearly defined, with sharp right angles and smooth faces of various sizes. In the field of crystallography, these are called monoclinic crystals. Their shape is determined by the way the individual sugar molecules fit together, which is similar to the way the shape of a pile of oranges is determined by the shape of the individual oranges and the way they stack together.
(As for myself, I'd rather have the recipe to make those Sour Watermelons in the back there!)
Original here! and many 7th grade science classrooms. :P
You'll Need:
• 4 cups sugar
• 2 cups water
- a small saucepan
- a wooden spoon
- a candy thermometer
- a small, clean glass jar
- a measuring cup
- cotton string
- a weight to hang on the string (such as a screw or galvanized washer)
- waxed paper
- a pencil (to suspend the string in the jar)
-(optinal: food color and flavoring)
Directions:
1. Heat the water in the saucepan over medium-high heat until it comes to a boil.
2. Completely dissolve the sugar in the boiling water, stirring continuously with the wooden spoon until the solution grows clear and it reaches a rolling boil.
3. Remove the solution from the heat, and then carefully pour it into the jar. Cover the jar with a small piece of waxed paper.
4. Tie the weight to one end of the string, and then tie the other end to the middle of the pencil. The string should be about two-thirds as long as the jar is deep. Dip the string into the sugar solution, remove it, lay it on a piece of waxed paper, straighten it out, and let it dry for a few days.
5. Gently suspend the prepared string in the solution and let sit at room temperature, undisturbed, for several days. You can check each day to see how much your crystals have grown. It’s tempting, but don’t touch the jar until the experiment is finished-it usually takes about seven days.
6. At the end of the week, the crystals on your string should be clearly defined, with sharp right angles and smooth faces of various sizes. In the field of crystallography, these are called monoclinic crystals. Their shape is determined by the way the individual sugar molecules fit together, which is similar to the way the shape of a pile of oranges is determined by the shape of the individual oranges and the way they stack together.
(As for myself, I'd rather have the recipe to make those Sour Watermelons in the back there!)
Original here! and many 7th grade science classrooms. :P