How+to+make+the+best+crystals

= Does changing the speed at which water is cooled down affect the size and purity of crystals? =

By Chloe and Sam = __Task 1: Answer these Questions__  =

__1. How do you make a saturated solution? You add a heap of a solid into the water and mix. It will dissolve or disappear. But if you keep adding more and more of the solid into the liquid it will stop dissolving and the water will start getting cloudy. When no more solid can dissolve this is called a Saturated solution__

__2. Which holds more sugar: cold water or hot water? Hot water because it can hold more solids before it forms saturated solution__

__3. How do crystals grow? You can make the crystals is Recrystallization?__

__4. Why does slower cooling result in purer crystals? Because they get more time to form their shape. Also when it starts to get cool the parts that are unwanted leave to make a pure and large crystals__

__Task 2: List your independent, dependent and controlled variables:__
__1. Independent variable: Change the temperature of the liquid.__

__2. Dependent variable: Measure the size and purity.__

__3. Controlled variables:same amount of borax, same amount of liquid.__

= __Task 3: What is the hypothesis for your experiment?__  = We think hot water will make pure and larger crystals. = __Task 4: What equipment do you need for your experiment?__  = String, large bowl , scissors , pot with a lid , wax paper , Identical jars or large drinking glasses (3) , Ice enough to fill a large bowl 3 times , borax , water , thermometer , pencils (3) , tablespoon. = __Task 5: List all steps in the method of your experiment (try and include a diagram or video that helps explain):__  = 1.We are recrystallizing borax under 3 different temperature conditions.In a refrigerator, at room temperature and in a ice bath. 2. Then we have to make a ice bath, Then we place it on a counter top , where it can be undisturbed for at least 5 hours. 3. as soon as the ice bath is done use the thermometer to take the temperature of the ice bath, the refrigerator and the room.record the Temperature in a notebook. 4.cut three pieces of string tie around pencils, string same size , the pencils get laid across the top of the jar , the end of the string hangs down just above the bottom of the jar. 5.Bring enough water to fill each jar three-fourths full in a pot. 6.add 1 table spoon (Tbsp) of borax to the water and stir until it dissolves. Repeat, 1 Tbsp at a time, until no more borax will dissolve .this is a saturated solution. 7.pour equal amounts of the saturated solution into three jars. the jars should be three-fourths full. 8.lay a pencil across the top of the jars so the strings hang down into the saturated solution 9. cover the jars with plastic wrap ,wax paper or aluminum foil 10.place one jar in the fridge leave one of them undisturbed on a countertop ( or a table) at room temperature, and in the ice bath

__**Task 6: Observation and discussion**__ Note down what you noticed as you did each experiment. Try and include an image or a video or photos of your experiment.

__Experiment 1 Observations:__

__Experiment 2 Observations:__

__Experiment 3 Observations:__

= __Task 7: Results__ =

Take a screen shot of your results table. Upload it and put it here:

__Task 8: Conclusion__
Write a statement that says whether your hypothesis was wrong. If you were wrong, why were you wrong?