Super Saturated Snow Crystals. The Whole Enchilada!!!
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Transcript of Super Saturated Snow Crystals. The Whole Enchilada!!!
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Super Saturated Snow Crystals
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The Whole Enchilada!!!
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Here’s What We’re Doing
Create Your Snowflake
1.Observe2.Photograph
3.Write a sceneon the
Science behindIt’s formation
Create a Digital storyin Tech and a podcast.
1
23
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Your Mission Today
• Create a Super Saturated Solution!!
• Grow borax crystals and observe their formation and crystal shapes.
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Questions to Ponder???• Do the crystals grow separately, or do they
often grow together?
• What color are your crystals? Are they shiny? Do the surfaces look flat or a little curved?
• Why did we use hot water to dissolve the borax? Why did it form crystals, as it cooled down? Did it help that the water was evaporating?
• What would happen if you put your borax crystals back into some hot water?
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Borax
sodium tetra borate decahydrate
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What are Crystals?What are Crystals?• http://www.visuwords.com/
• A crystal is: a solid with a definite geometric shape.
• It consists of various atoms and molecules arranged in a uniform repeating pattern.
• They can be big or small. They all have the same shape.
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Definition of Crystal
•A solid with a definite geometric shape.
smooth, flat surfaces that meet in sharp edges or corners.
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Salt crystals
Sugar crystals
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How do crystals form?• Solvent- what matter is dissolved in. • ex. Water.• • Solute - dissolved matter in a solution• Ex. Salt, sugar, ice tea mix.
• Solution-a uniform mixture of two or more substances. Ex. The ice tea mix dissolve in water.
• a solute is dissolved in another substance, known as a solvent = solution
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Solute…Borax
Solvent…water
Solution…Borax+ water
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SOLUBILITY• SOLUBILITY is the ability of a substance to
dissolve. The amount of a substance (solute) that can be dissolved in a given amount of solvent.
• The solubility of a substance is the maximum amount of the solute that can be dissolved in given quantity of solvent.
• The resulting solution is called a saturated solution. Or a super saturated solution!
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•A solvent (water) can only hold a certain amount of solute.
•This is called the SOLUBILITY of a solution.
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• We use heated water because the increase in temperature helps dissolve more solid substance than cold water.
• Why? Because heated molecules move farther apart.
• They make room for more solid substances to dissolve.
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• When no more of the solid substance can be dissolved the solution is said to be
• SATURATED.• You will be creating a Super
Saturated Solution!
• As the solution cools the water molecules move closer together again and there’s less room for the solution to hold onto as much of the dissolved substance.
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Your Photostory• 250 word story about a crystal. How it came to
be, what it’s made of, etc.
• Use your imagination. Make it fun and whimsical. Can be a fairy tale, science fiction, advertisement, TV program etc.
• Must use all vocabulary about crystal; the list is on the back of your science rubric.
Solution, solvent, solute, saturated, super saturated, borax, water,dissolved, etc.
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Two Grades
• One for lab, crystal, how you worked with your partner, and your story with science information
• Technology grade for photostory.
• You will have a rubric for the science part and a rubric for the tech. part.
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Materials.
• Borax (3 tabs./1 cup of water)• Boiling Water• Beaker• Table spoon• Pipe cleaners• String• Scissors• Wooden dowel or stick• Food coloring…optional
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Procedure1. Label your beaker with masking tape and
names so you can find it again. 2. Take 2 or 3 pipe-cleaners.
3. Twist the pipe cleaners together to make a snow flake. Cut the ends to make them even.
4. Tie the string around one of the pipe cleaners. Tie the other end of the string stick.
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• 5. Make sure the snowflake hangs and dangles inside the beaker. It must not touch the bottom of the beaker.
• 6. Make sure the snowflake is not in the beaker when you pour boiling water into the beaker. (SAFETY PRECAUTION!!)
• 7. add the Borax to the hot water in the beaker
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8. Keep adding Borax 1 tablespoon at a time until you have supersaturated the solution.
HINT: You will see undissolved Borax at the bottom of the jar.
Rule of Thumb 3 TABS. OF BORAX TO 1 CUP OF WATER.
optional; blue food coloring.
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When You’re Finished• Clean up. All materials back when they
belong. Part of your grade!
• Label your Beaker…tape/names. Put beaker in designated area. Cart or window sill.
• Lab Note section: record data: materials/procedure
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Grade
•Completeness of lab notes.
•Following of directions for lab.
•Story content for digital story-telling.
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ObservationsYour Data Collection in your lab section
•Date!!!! •Written description•Sketch•Temperature of Water
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Pre-Lab
• Partners• Preview materials/procedures• Group assessment survey• Use of labquest• WallWisher: exit slip• Tuesday homework: Write draft of
script.