Growing rock candy crystals final

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Information about Growing rock candy crystals final

Published on August 2, 2012

Author: vickyreardon5


Growing rock candy crystals: Growing rock candy crystals Exploring how the presence of seed crystals changes the growth rate of rock candy. By Madison and Emma Hypothesis: Hypothesis We think that the seed crystals will change the growth rate of the rock candy and make more crystals than the control string (non seeded string). Purpose: Purpose So how do the molecules of a substance get together to form a crystal? There have to be enough molecules in one area that they have a high chance of bumping into one another. This happens when a solution, which is made up of a liquid and the compound that will be crystallized, is saturated. In the rock candy, the liquid is water and the compound is sugar. A solution is saturated when the liquid holds as much of the compound dissolved in it as possible. For example, when making rock candy, you dissolve as much sugar as possible in water to make a saturated solution. If you add more compound than can dissolve in the liquid, the un-dissolved bits remain as solids in the liquid. In a saturated solution, the molecules bump into one another frequently because there are so many of them. Occasionally when they bump into each other, the molecules end up sticking together; this is the beginning of the crystallization process and is called nucleation. Once several molecules are already stuck together, they actively attract other molecules to join them. This slow process is how the crystal "grows." Question: Question How does the presence of seed crystals change the growth rate of rock candy? Materials: Materials Yarn or cotton string Water Cup Tablespoon measuring spoon Small plate Granulated white sugar Glass jars Stove Clean screws Marker to write with Ruler with centimeters Measuring cup for liquids Measuring cup for solids Wooden mixing spoon Pot holders Paper towel Tape Pot Wax paper Popsicle sticks Procedure: Procedure Cool! Cut two pieces of yarn. Each piece should be about 1 inch longer than the height of the glass jars: Cut two pieces of yarn. Each piece should be about 1 inch longer than the height of the glass jars PowerPoint Presentation: Set one of the pieces aside and don’t do anything to it. Soak the other piece of string in a cup of water for 5 minutes After soaking use your hands to squeeze extra water from the string. Roll the string in 1 tablespoon of sugar on the small plate. The string will be coated with sugar. These small bits of sugar are the seeds on which other sugar crystals might grow Lay both your seeded (sugar coated) string and your control string on a piece of wax paper overnight. MAKE SURE THEY ARE NOT TOUCHING. PowerPoint Presentation: a. Take your seeded string and tie one end to a screw. It is ok if some of the sugar falls off while you are tying it to the weight. Repeat the process with the non seeded string and a second weight. Be sure to use the same type of weight for each string. Day 2 PowerPoint Presentation: b. Tie the other end of each string to a popsicle stick. Using a marker color the edges of the popsicle stick of the seeded string incase you forget later. c. Lower the weighted end of the seeded string into one of the jars and rest the popsicle stick across the mouth of the jar. Roll the popsicle stick to wind the string until the weight is about 1 centimeter from the bottom of the jar. Tape the string around the popsicle stick so that the length of the string cannot change. Repeat this process for the control string, then take the strings out and set aside. PowerPoint Presentation: . Preheat the glass jars. This will ensure that you are not adding hot sugar water to a cold jar which would cause a dramatic temperature change that could disrupt your rock candy. a. boil enough water to fill both jars b. when the water is boiling carefully pour it into the jars c. let the full jars sit with the hot water in them until the sugar water is ready PowerPoint Presentation: Make the sugar water solution a. using a liquid measuring cup add 1 cup of water to a pot. Bring the water to a rolling boil on the stove. Turn the heat down low. b. using a dry measuring cup add 2 cups of sugar to the hot water c. mix with a wooden mixing spoon until all the sugar has dissolved d. turn the heat back up and wait until the sugar water solution returns to a rolling boil. Make sure to keep stirring so that the temperature is consistent throughout the mixture e. remove the boiling solution from the stove f. continue to add sugar 1 tablespoon at a time. Stir thoroughly after each spoonful making sure that the sugar is all dissolved before adding another tablespoon. g. keep adding sugar until no more will dissolve, if you’ve added too much sugar no worries. Just keep stirring after 2 minutes of stirring you haven’t dissolved all your sugar return the pot to the stove. This should help get that last bit of sugar in. PowerPoint Presentation: . After the sugar water solution has cooled for five minutes, pour the solution into the two jars splitting the liquid equally between them 7. Using pot holders move the jars of sugar-water solution to a place where they can be left undisturbed for one week. Place both jars in the same location. Large fluctuations in temperature can interfere with the crystallization process, so avoid putting them near heating or cooling vents 8.Carefully lower the strings into the sugar water solution, one string per jar 9.Securely tape the popsicle sticks holding the strings to the edges of the jars to prevent the strings from accidentally being jostled Conclusion: Conclusion Crystals form when the smallest particles of a substance, the molecules, arrange themselves in an orderly and repetitive pattern. This make’s a saturated solution of sugar and water to grow rock candy sugar crystals. We compared the rate of growth between rock candy that is left to nucleate on its own in the solution, and rock candy that starts off with some assistance. To assist this rock candy, we jump-started the nucleation process by adding sugar crystals, called seed crystals, to the string first. This experiment concluded that a seeded string will grow rock candy much faster than a non-seeded string. CREDITS!: CREDITS! Sandra Slutz PhD Science Buddies Vicky Reardon Thank you! Thanks for watching!: Thanks for watching! PowerPoint presentation “Growing rock candy crystals” By Madison Reardon and Emma Reardon

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