Chemistry of Water 97 1. Knowing how important pH can be to living organisms, what effect does acid rain have on forests? 2. What does the "p" stand for in the term pH? 3. pH is a measure of ion concentration. 4. A pH of 3 would be... (circle your choice) Acid or Base 5. A pH of 11 would be . .. (circle your choice) Acid or Base 6. What is the relationship between H+ and OH- at a pH of 7? 7. How much more H+ is in water at a pH of 3 when compared to a pH of 6? 8. How much more OH- is in water at a pH of 11 when compared to a pH of 7?

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3. For the following scenarios explain which water properties are making this possible. a. You see a 50 foot pine tree. What secondary water property is this? i. What two water properties allow the secondary water property to be possible. b. You see a bug walking on the water. Which secondary property of water makes this possible? i. Which primary property of water creates this secondary property? c. You see fish living in a frozen pond in the winter. Which primary water property makes this possible? i. Explain how it is possible for organisms to still be alive under the frozen surface using the property of high specific heat and less dense as a solid. d. A student creates a blood model using vegetable oil and water (with red food coloring) to show the separation of plasma from the red blood cells. i. What property of water prevents the oil and water from mixing. ii. (Also which substance is hydrophobic and which is hydrophilic and what do those terms mean).