Stickin Together: Surface Tension, Cohension, and Adhesion

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1 Stickin Tgether: Surface Tensin, Chensin, and Adhesin FRAMEWORK I. Scientific and Engineering Practices II. Crss-Cutting Cncepts III. Physical Sciences SKILLS/OBJECTIVES Explring water s ability t stick t itself and ther materials; seeing what amazing prperties this prduces; cnnecting these facts t everyday bservatins like water s meniscus, the ability fr bjects t flat n water, dew drps frming n plants, and the mvement f water frm rt t stem in plants. MATERIALS Water (1 galln?) 2 test tubes Pipettes pennies 20 small Dixie cups 5 larger glasses Rll f paper twels paper clips Sap Oil, ethanl (1/2 galln each?) Fd dye NOTES The capillary actin activity shuld be re-visited at the end f the lessns t examine its prgress The first activity shuld be dne as a large grup, but the rest can be in smaller grups (3-5) kids with a club member. These activities shuld be accessible t all age grups

2 BACKGROUND Water is all arund us and is necessary fr every kind f life n this planet. Mst f yur bdy is made f water, and s is mst f the planet! There are sme really special and cl things abut water that make it unique. It is actually really sticky stuff, even thugh it desn t feel that way. It is able t grab nt itself better than a lt f ther material. When it sticks t itself, water becmes very strng and able t hld things. Have yu ever seen a bug walking n the water? The key idea here is that water sticks t things, especially itself, by grabbing and hlding n which can lead t incredible strength and the ability t wrk against ther frces. Activity # 1 Materials Hydrgen Bnding Nne Wrksheet Nne This is t prvide an intrductin t the idea f hydrgen bnding. Have each f the kids be an individual mlecule f water (r if they dn t understand that, maybe a part r piece f water?). Water likes t hang ut with friends, s everyne shuld try t hld hands (feet?) with as many peple as they can at nce! In water, this kind f hlding hands and feet is called a Hydrgen Bnd. Nw everyne is ging t be a different kind f liquid, like ethanl r il. These liquids dn t like hanging ut with ther peple as much, s everyne can nly hld hands with ne ther persn and put the ther hand behind their backs. Which f these liquids, water r ethanl/il, is strnger? If we were t thrw a stuffed animal n tp f yu, which grup wuld prevent it frm hitting the grund? Water is strnger because it likes t stick tgether!. Activity #2 Capillary Actin Paper Twel Race! Materials 2 test tubes 1 small Dixie cup filled with water 1 small Dixie cup filled with il 2 empty Dixie cups 2 pieces f twisted paper twel Fd dye

3 Wrksheet Nne This activity shws hw water may adhere t ther surfaces t wrk against the frce f gravity. This same principle, water s ability t stick t nn-water surfaces, is respnsible fr cncave appearance f water s meniscus. Mercury, n the ther hand, has little adhesive prperties, s the liquid in a thermmeter, fr example, frms a cnvex meniscus. Similarly, adhesin allws water t flw up small-diameter tubes, the rt-sht system in plants. *This shuld be dne as a grup in frnt f the whle class* Pur water int ne test tube and il int anther The tp f the liquid, where liquid meets the air, is called the meniscus. It lks different fr different liquids. -Examine the meniscus f the water and cmpare it t that f the il. What des it lk like? Hw are they different? The liquid with greater adhesive prperties will climb higher up n the side f the test tube Pur water int ne cup and il int anther Add fd dye clr f the kids chice t the cup full f water and f il s it is easier t see. Kids twist a piece f paper twel until in lks like a string. They then place ne end f the paper twel in the full cup f water and ne end in the empty glass. D the same fr the cup f il. Examine prgress at end f class. They shuld bserve that the water can travel up the paper twel and int the empty cup faster/mre than the il. Have yu seen this befre? Hw des this relate t hw plants get water frm the grund? Activity # 2 Drplet Materials Pipettes Cup f water Pennies Other liquids Wrksheet Nne This activity lks at the ability f water t frm sizable drplets due t chesin. When the drplet gets t large, the pressure inside it verwhelms the weaker frces f chesin acting n the surface, s the drplet bursts. Kids use pipettes t drp water nt pennies If there is extra time, they culd try t d the same with il r ethanl Befre they begin, ask hw many drps f water they think a penny can hld. Hw large can they get the water drplet befre it bursts? Which cin can hld the largest drplet? What happens when the cin is already wet? Are

4 there ther factrs that affect hw large the drplet can get? Wuld yu say the chesive frces are strng? Make sure they cmpare this t their daily bservatins abut water drplets n plants etc. Activity # 3 Surface Tensin Materials 1 glass filled with water Paperclip Paper twel Sap Wrksheet Nne This activity examines surface tensin by using this frce t flat a paperclip n the surface f water and seeing what kinds f things break surface tensin. Have kids put a paperclip in the glass f water and see that it just sinks t bttm. Why culdn t it flat? Why can little water bugs flat n tp f the water and nt this paperclip? Remve the paper clip and dry it Have kids tear ff a small piece f dry paper twel t place underneath the paperclip. Put bth twel and paperclip in the glass f water. The water will sak the paper twel, sinking it (yu may want t push the paper twel dwn with yur finger), leaving the dry paperclip t flat n the surface f the water. What was different this time? Did the paperclip weigh any less? Have kids put a drp f sap nt/near the paperclip and watch as the paperclip sinks. What happened here? What is imprtant t maintain surface tensin? Kids may then try this activity in the ther liquids. The paperclip did nt sink the secnd time because it did nt disturb the water s surface tensin; the paper twel did that jb fr it. The sap breaks the surface tensin and the paperclip sinks. Appendix f Inf fr Us Grwn-Ups Water has such high surface tensin, chesive, and adhesive prperties because f its ability t frm H-bnds. In bulk water, each water mlecule can frm 4 H- bnds. When adhering t ther surfaces, dispersive frces allw water t make weak bnds with ther materials; this causes capillary actin and the frmatin f a meniscus etc. Other kinds f liquids aren t typically able t make as many H- bnds; ethanl fr example, has a lwer surface tensin/chesive abilities Surface tensin and chesin are essentially different wrds fr the same prperty f water: its ability t make H-bnds. Adhesin has a different underlying mechanism

5 CONCLUSIONS Water likes t grab nt itself and thers, s it can hld weight, make drplet shapes, and travel up little tubes. These features are necessary fr sme f the things we see every day! Whenever a water drplet sticks t yur windw, r yu water a plant, think f all the different frces ging n in there!

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