IN COLLECTION

# Properties of Water Exploration

 Station 1: Polar~ opposite ends, opposite charges 1. Please draw a model of a molecule of water and label the areas of positive and negative charge. 2. Rub the balloon on your head and build up a lot of static charge. It is better to use someone’s hair that doesn’t use a lot of product. Now, with the pipette, squirt a stream of water near (not on) the balloon. What do you notice happening? 3. Please explain your observation in terms of the chemistry behind water.

 Station 2: Cohesion~ H+ bonds holding the same type of molecules together 1. Predict: Can you put more drops of regular water or more drops of soapy water on a penny? ___________________ 2. Using a pipette, place as many drops of regular water on the penny as possible. _________ 3. Dry and repeat. __________ 4. Draw a side-view sketch of what your penny looked like just before the water fell off. 5. Wash your penny with faucet water, then dry and repeat with soapy water. ________ 6. Dry and repeat. _________ 7. Wash your penny with faucet water and then dry. 8. Sketch a bar graph of your data. 9. Please come up with a scientific explanation for your results. Hint…Soap contains a lot of hydroxide ions.

 Station 3: Density~ ratio between a substance’s mass and its volume (D=m/v) 1. Given the fact that the density of water is 1g/mL, that objects with a density of less than 1g/mL float, and those with a density greater than 1 sink, what do you know about the density of ice? 2. Would 1 gram of ice take up more space or less space than 1 gram of liquid water? Explain how you would know this. Hint…think about putting a water bottle in a freezer. 3. Write a short paragraph about how the world would be different if ice had a density of 1.1g/mL.