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EXERCISE 2
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CAI\ YOU FLOAT A PAPER CLIP?
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1. What emergentproperty(properties)of water is (are) demonstratedhere?
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2. How can the surfaceof wateract in this way?
3. Detergentlowersthe surfacetensionof water.What do you think would havehappened
to the paperclip if a drop of detergenthad beenplacedonto the waternearto it?
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CAI.IYOU OVERCOME THE ATTRACTION?
4. What emergentproperty(properties)of wateris (are)at work here?
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5. How are hydrogenbonds involvedin this (these)ProPerty(properties)?
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6. Explainwhy glassis describedas hydrophilic.
HOW DOES WATER MO\IE THROUGH PI.AI{TS?
7. What emergentpropertiesof water are at work here?How does water rise up the trlbe?
8. Why are thesepropertiesimportant to a plant's survival?
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WHERE DID IT GO?
9. What emergentpropertyof water is at work here?
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10. Basedon the valuesin Table1 givenaboveand your data table,discussthe differenceof
the volumesof liquid observedin lab.
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11. How do the valuesin Table1 relateto the relativevolumesobservedin the three
cylinders?
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12. Explainhow this propertyhelpskeepour bodiescool.
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IS A SOLID LIGHTER TI{AI{ A LIQUID?
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13. Why is the icecubeat the top or bottom of the alcohol?Water?
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EXERCISE 2 I PROPERTIES OF WATER: LAB R,EPORT
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14. Why is frozenwater(a solid)lessdensethan liquidwater?
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15. Explainhow this emergentProPertyof water is importantto marinelife'
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LII(E DISSOLVES LIKE?
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16. a. Why doesNaCl "dissolve"in an aqueoussolution?
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b. DoesNaCl dissolvein petroleumether?Explainyour answer'
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for compoundslikesalt (and glucose)tobe solublein the waler
1 7 . Whyis it essential
foundin our body?
18. a. Doessaladoil dissolvein wacer?Explainyour answer.
b. Doessaladoil dissolvein petroleumether?Explainyour answer.
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DOES WATER BOrL SOONER rF SALT IS ADDED? (DEMO)
1g. Doesrhe additionof salt makethe water boil fasteror slower?Why?What doessalt do
to the boilingpoint of water?
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EXERCISE 2 | PROPERTIES OF WATER: LAB R,EPOR,T
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20. Obtain an ice cube and add salt to it. What happensto the areaof icewherethe salt is
applied?Why is salt appliedto icy sidewalksor roads in the winter?What doessalt do
co the freezingpoint ofwater?
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21. Why is antifreezeadded to the radiator of a car?
IS WATERA GOOD CONDUCTOR OF ELECTRTCTTY?(DEMO)
22. Why did the light bulb remain"unlit" when the electrodes
wereplacedin the deionized
water?
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23. What do you seewith tap water? Why?
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24. Whydid the brightness
increase
with addedamountsof NaCl?
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25. Why doesthe lifeguardat the swimmingpool ask you to get out of the pool when
lightningis occurringif pure water is not a good conductor of electricity?
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HOWWELL CAI\ THE EIT{VIRONMENTCOUNTERACTTHE EFFECTSOF
ACrD RArN?(DEMO)
26. Wouldyouexpectacidrain(acidprecipitation)tobeagreaterprobleminanareawith
marblebedrockor granitebedrock?
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EXERCISE 2 I PROPERTIES OF WATER: LAB R,EPOR,T
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THE pH OF HOUSEHOLD ITEMS?
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27. What emergentpropertyof water is demonstratedhere?
28. Were thereany solutionswhereyour predictionwas verydifferentfrom the observedpH
of that solution?
COMPARING BUFFERING CAPACITY OF COMMERCIAL AT{TACIDS?
29. Of the antacidstested,which one had the bestbufferingcapacity?
30. Which antacidwould you pick if someonewas complainingof "Acid Indigestion"and
whv?
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EXERCISE 2 | PROPERTIES OF WATER: LAB R,EPORT
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