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1) Choose a region (state, province, part of a country or country) and discuss their carrying capacity relative to Lester Brown’s three factors. Include the constraint in terms of the current populations and future population trends. 2) Describe the various ways that water is used as an ecosystem service. How do these uses impact ecosystem function? Provide examples. 3) Discuss examples of soil loss and their causes. How can these be tied to population transitions in human civilizations? Two pages of each topic ...

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2-13: Creating a Solut i on of Known Molarity In this assignment, y o u will weigh out asa m p le of baking soda (NaHC O 3 ) and create a solution ofknown m o l arit y . 1. Start VirtualChemLab, select Reactions and Stoichiometry, and then select Creating aSolut i on of Known M o larity from t he list of assig n m ents.The lab will open in the Ti t ration laborato r y . 2. In the labora t o r y , a bot t le of baking soda (sodiumbicarbonate, NaHCO 3 ) will be next to thebalance, and an e m ptybeaker will be on the stir plate. Drag the e m ptybeaker to the spot l ight next t o t h e balance, clickin the Ba l an c e area to zoomin, place aweigh paper on the balan c e, and tare the balance. 3. Open the bot t le by clicking on the l i d ( Remove Li d ). Pick up the S c oo p and scoop out so m e sa m ple by first dragging the scoop tothe m outh of the bottle and then pull i ngthe scoop down the face of the bottle. As the scoop is dragged down t h e face of the bottle it will p i ckup different quantities ofsolid. Select the largest sa m ple possible and d r ag the scoop t othe weighing paper on th e balance until it snaps in place and then let go. This will put app r oximately1 gofsa m ple on the balance. Repeat with a second Scoop . Record the m a ss of the NaHCO 3 in the data table. 4. Drag the we i gh paper to the beaker and add the NaHC O 3 sa m p le t othe beaker. Click on thegreen Zoom Out arrow to return t othe laborator y . 5. Drag the beaker to the 50mL graduated c y l i nder (thelargest one) by the sink and e m ptythe sa m ple into the c y linder. Hold thec y l i nder under the tap unt i l it fills withwater to m a k e an aqueous solution of NaHC O 3 . (When the graduated c y linder is full it will auto m at i ca l ly snap back into place.) Note that the solid is added and dissolved before the volu m e ismeasured when m aking a m ol ar solution. Che m ists normallyuse a volu m etric flask for m aking m o l ar solutions, but t his is not available in the s i m ulation. 6. Determine the liters of solution i nthe c ylinder and r ecord the da t a in thedata t able. 7. Determine the moles of NaHCO 3 in the sample and r e cord the datain the da t a table. Data T a ble ma s s N a HC O 3 m o l es N aH C O 3 liters solution 8. The m olarityis calcula t ed using the fo r m u l a: mass solute molarity = = molarmasssolute moles solute L solution L solution 67 Virtual ChemLab: General Chemistry, Student Lab Manual/Workbook, v4.5 , Third Edition, by Brian F. Woodfield and Matthew C. Asplund. Published by Prentice Hall. Copyright © 2013 by Pearson Education, Inc. Rea c tionsandS t oichiom e t r y Calculate the molarity of t h e NaHCO 3 solution inun i ts of mol/ L . .

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1) Choose a region (state, province, part of a country or country) a

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