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1. Prepare the buoy by attaching a small ball of plasticine to the end of a drinking straw. Press the underside of the ball on the table to make it flat.

2. Take one or a few short video clips/photos of you/your group releasing the buoy into the measuring cylinder containing water. The video clips need not illustrate perfect execution of the experimental steps. 😊

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Task 1: Finding the correlation between the height of the buoy and its weight

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Task 1: Finding the correlation between the height of the buoy and its weight

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1. Record the height of the buoy as its weight increases.
2. Post photo of each stage/step you have carried out.
3. State the conclusion: When the weight of the buoy increases, the height of the base of the buoy_________
4. Other than recording your observations on the worksheet provided, is there other way/form for us to record our observations/data?

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Task 2: Finding the correlation between the height of the buoy and the surface of the water

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Task 2: Finding the correlation between the height of the buoy and the surface of the water

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1. Record the height of the buoy as more water is added to the measuring cylinder.
2. Post photo of each stage/step you have carried out.
3. State the conclusion: When the surface of the water rises, the height of the base of the buoy_____________

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Task 3: Finding the correlation between the height of the buoy and the concentration of salt in the water

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Task 3: Finding the correlation between the height of the buoy and the concentration of salt in the water

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1.  Record the height of the buoy as the salt concentration increases.
2. Post photo of each stage/step you have carried out.
3. State the conclusion: When the concentration of the salt increases, the height of the base of the buoy______________

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Task 4: Determining the concentration of the salt in the unknown solution 

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Task 4: Determining the concentration of the salt in the unknown solution 

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(a)    Briefly describe the method you would use to determine the concentration of the salt in an unknown solution.

(b)    Estimate the concentration of the solution.
(c) Post photo of each step/stage you have carried out.

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What are some problems you came across in this experiment?

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Reflection for Exp 1 (Take it with a Grain of Salt)

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Our ball

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We used this as a new one.

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When you add more plasticine,will the straw sink or float?

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When you add more plasticine,will the straw sink or float?

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When you add more plasticine, the straw will sink deeper

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45

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Our ball is between 5 and 15 notches.(10 nocthes)

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Havisha,enzo,lorey,jotham

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Havisha,enzo,jotham,lorey

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Random mystery don't know solution with the ball:

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Random mystery don't know solution with the ball:

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estimation:5%

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20ml

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5% salt water soloution

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20%