Lesson and Lab #3: Student Worksheet NAME______________________________________ 1. What are some of the sinks or storage places for carbon in the carbon cycle? 2. Label the chemical equations involved in ocean acidification by doing the following: ‐ Place the following words in the correct place above the chemical equations: products; reactants; reacts with/yields/produces ‐ Label the compounds on the lines below each compound: carbon dioxide; carbonic acid; water; bicarbonate ion and carbonate ions [ ] [ ] [ ] CO2 + H2O Æ H2CO3 ____________ __________ _________________ [ ] [ ] [ ] H2CO3 + CO32‐ Æ 2HCO3‐ ___________ ____________ ________________ In the following compound, how many atoms are present for each element: H2CO3 Hydrogen= _____atom(s) Carbon = ______atom(s) Oxygen = _____ atom(s) Are each of these balanced equations? _____ Why or why not? Summary: Select one statement from each set of statements that best describes the impact of ocean acidification. Put a check by the ones you feel best explain the impact. Set #1: _____ Carbon enters or is added to the ocean as carbon dioxide and carbonate compounds from many sources and biological processes like photosynthesis, shell building, and the formation of sediments and rocks. ___ Carbon enters or is added to the ocean as carbon dioxide and carbonate compounds from many sources such as from the air when fossil fuels are burned, from biological processes such as respiration and decomposition of shells. Set #2: ___ Carbon is removed from the ocean during the formation of carbonate sediments, formation of rocks like limestone, and formation of fossil fuels like oil _____ Carbon is removed from the water during biological processes such as respiration, during decomposition of shells and the burning of fossil fuels. Set #3: _____ There is evidence that the excess carbon contributed to the air in the form of carbon dioxide is due to the burning or combustion of fossil fuels. This contribution is not changing pH of the oceans. ____ There is evidence that the excess carbon contributed to the air in the form of carbon dioxide due to the burning or combustion of fossil fuels is contributing to the changing pH of the oceans. Set #4: ______The oceans are acidic and becoming more acidic due to the increase in carbon dioxide that diffuses into the water from the air. ____ The ocean is alkaline or slightly basic and is becoming less basic (slightly less alkaline) due to the increase in carbon dioxide that diffuses into the water from the air. Set #5: _____ Scientists observed that carbonate shells of animals and coral reefs are quickly dissolving as a main impact of the changing ocean pH. ___ Scientists observed that carbonate shells and corals are not finding sufficient levels of calcium carbonate in ocean water to build shell and reef material due to changing oceanic pH. TEACHER Lesson and Lab #3: Student Worksheet NAME______________________________________ 1. What are some of the sinks or storage places for carbon in the carbon cycle? Living organisms, the ocean, and the atmosphere are several sinks or storage places for carbon traveling through the carbon cycle. 2. Label the chemical equations involved in ocean acidification by doing the following: ‐ Place the following words in the correct place above the chemical equations: products; reactants; reacts with/yields/produces ‐ Label the compounds on the lines below each compound: carbon dioxide; carbonic acid; water; bicarbonate ion and carbonate ions [ REACTANTS ] [ YIELDS ] [ PRODUCT ] CO2 + H2O Æ H2CO3 Carbon dioxide Water Carbonic Acid [ REACTANTS ] [ YIELDS ] [ PRODUCT ] H2CO3 + CO32‐ Æ 2HCO3‐ Carbonic Acid Carbonate Ion Bicarbonate In the following compound, how many atoms are present for each element: H2CO3 Hydrogen= 2 atom(s) Carbon = 1 atom(s) Oxygen = 3 atom(s) Are each of these balanced equations? _YES Why or why not? Both sides of the equation has the same number atoms for each element. TEACHER Summary: Select one statement from each set of statements that best describes the impact of ocean acidification. Put a check by the ones you feel best explain the impact. Set #1: _____ Carbon enters or is added to the ocean as carbon dioxide and carbonate compounds from many sources and biological processes like photosynthesis, shell building, and the formation of sediments and rocks. X Carbon enters or is added to the ocean as carbon dioxide and carbonate compounds from many sources such as from the air when fossil fuels are burned, from biological processes such as respiration and decomposition of shells. Set #2: X Carbon is removed from the ocean during the formation of carbonate sediments, formation of rocks like limestone, and formation of fossil fuels like oil _____ Carbon is removed from the water during biological processes such as respiration, during decomposition of shells and the burning of fossil fuels. Set #3: _____ There is evidence that the excess carbon contributed to the air in the form of carbon dioxide is due to the burning or combustion of fossil fuels. This contribution is not changing pH of the oceans. X There is evidence that the excess carbon contributed to the air in the form of carbon dioxide due to the burning or combustion of fossil fuels is contributing to the changing pH of the oceans. Set #4: ______The oceans are acidic and becoming more acidic due to the increase in carbon dioxide that diffuses into the water from the air. X The ocean is alkaline or slightly basic and is becoming less basic (slightly less alkaline) due to the increase in carbon dioxide that diffuses into the water from the air. Set #5: _____ Scientists observed that carbonate shells of animals and coral reefs are quickly dissolving as a main impact of the changing ocean pH. X Scientists observed that carbonate shells and corals are not finding sufficient levels of calcium carbonate in ocean water to build shell and reef material due to changing oceanic pH.