Science Water Unit

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Water
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liquid earth material
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dome or bead
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shape water forms when surface tension occurs
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property
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characteristic that can be observed
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absord
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to soak into another material
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surface tension
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when water molecules hold on tightly to each other forming a sking like form on a surface
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slope
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inclined hill, slanted surface
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porous
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a material that water can absorb
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coheshion
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when water molecules are attracted to other water molecules
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adhesion
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when water molecules are attracted to other substances
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capillary action
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movement of water within spaces of a porous material because of cohesion, adhesion or surface tension
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Describe water on 4 different surfaces
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1. paper towel – absorbed the water quickly 2. white paper – absorbed water slowly 3. aluminum foil – did not absorb the water, the water sat on top and spread out 4. wax paper – the water beaded up forming domes of water
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Describe water on a penny, using plaing water, salt water, soapy water
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1. plain water on penny took about 20 drops before the suface tension broke 2. salt water on penny took about 24 drops before suface tension broke 3. soapy water took about 17 drops before the suface tension broke
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What broke the suface tension faster on the penny?
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The soapy water, that’s why we use soap to clean dirt off dishes and clothing
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Describe water occured when we put different size water drops on a slope?
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Larger drops move faster and the steeper the slope the faster the water beads moved down the slope. Cohesion was seen when the water molecules attached to each other and made larger beads
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Explain what happened when we used colored water in a one cup, a paper towel and an empty cup. Use your knowledge of cohesion, adhesion, and capillary action to describe.
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We took one cup and added water with food coloring. Next we twisted a paper towel and dipped one side of it into the colored water. and the other end we placed in the empty cup. We watched the color water travel up the paper towel and drip into the cup that had nothing in it. The water moved up the porous paper towel because of capillary actioned caused it to move. Adhesion caused the water molecules to attach to the paper towel.
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During the straw experiment, whch straw did the most water travel up?
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The thinnest straw
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Explain what happened when you used the thinnest straw and the larger straw.
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Cohesion makes the water molecules stick together. They stay together when they stick to the inside of the straw because of adhesion. Since the thinnest straw does not have a lot of room for the molecules to move, it forces the water to rise. Capillary action was greatest in the thinner straw The larger straw has a lot more room so the water molecules bounce around and water rises slower
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Give a real life example where the properties of water occur. Try to include cohesion, surface tension, adhesion, capillary action, transparency, and/or solid liquid or gas
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Property of water can be found in 3 different states, solid frozen, liquid or gas *Putting water in a cup and freezing it, ice is the solid form *Letting that cup with ice sit in the sun and melt. The ice turns into a liquid *If you leave that cup out all day, the water will evaporate and the liquid will become a gas
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Where do we see surface tension in our life?
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Bubbles are an example of surface tension. If you make a bubble solution the molecules want to touch other bubble molecules only. If you blow air into a soap bubble the liquid bubbles will stick together and wrap around the air keeping the air inside making a round bubble shape. This is why the bubble doesn’t pop until you touch it or it hits somehting, then the surface tension breaks

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