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Water Properties

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brittany holman

on 22 September 2012

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Transcript of Water Properties

Water properties water is used so much everyday and we don't even think about how complex it is! the hydrogen bonds hold together because of the attraction between water molecules Cohesion adhesion is when water sticks to cell walls Adhesion adhesion is the cause of water sticking to spiderwebs. there are different kinds of adhesion examples: mechanical adhesion: when surfaces interlock chemical adhesion happens when surface atoms go through covalent, ionic, or hydrogen bonding electrostatic adhesion happens when electrons pass through a conductor and then forms a different electrostatic force diffusive adhesion holds surfaces together by diffusion and the final example is dispersive adhesion which holds materials together by van der waals forces Surface Tension surface tension is how hard it is to stretch or break the surface of a liquid the order of hydrogen bonds on top of the water are like an invisible film. because the water surface isn't easy for the water strider to break it can walk on the water. surface tension is the reason that drops of water form little dome like balls. Capillary Action just like capillary is a tiny, narrow vein, capillary action is when water can go trough very small spaces without gravity or other external forces acted on it. Capillary action a combination of cohesion, adhesion, and surface tension. why does water dome up like this!? The answer is because water sticks to the cell walls(basically it sticks to things other than itself) this is adhesion. hydrogen bonds in water molecules cause adhesion. The narrower the tube, the taller the water is going to be and the wider the tube is the shorter the water is going to be. example of adhesion This happens because of the polar way of water molecules and this gives the molecules partial charges on oxygen and hydrogen This is how cohesion and capillary action are used when plants and trees get water through evaporation cohesion contributes to the transport of water cohesion also plays a role in dissolving nutrients aginst gravity in plants this happens when hydrogen bonds tug molecules down When the temperature of the water goes down, the kinetic energy of the water molecules decrease and slow down because ice is 10% less dense than water, the iceberg floats when one water molecule is bonded to four other molecules they try to stay away from each other, which makes ice 10% less dense than water ice, ice and more ice!! when water freezes it becomes locked into a crystalline lattice water molecules before they freeze frozen water molecules ice floats! If water is froze, heat energy is released which prevents anymore cooling of the surroundings and that keeps the temperature of the water stable density also allows us to swim or float! to find the density of something you do mass/volume this is important to living things, density helps things float ph! ph is how acidic something is the ph of water is neutral, its 7 if something is too acidic, it could kill a living organism an acid is when a molecule shares protons a base is when the molecules share electrons a base is 0-6 in the ph scale orange juice is an object of an acidic luquid water!! unhealthy water : doesn't have minerals chemical polarity's water is a "polar" molecule being a polar molecule means that electron density is not equal water has a partial negative charge near the oxygen molecule polarity is the reason that ions and other molecules can dissolve in water. NaCL structure
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