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17 Cards in this Set
- Front
- Back
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What makes possible the incredible characteristics of water?
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Its ability to H-bond
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What are the two kinds of H-bonds water forms
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dipole-dipole and dipole-ion
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What does amphipathic mean?
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both hydrophillic and hydrophobic (usually molecules that contain both types of moities)
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What is the "universal solvent"
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Water
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By molecular weight, what should water be?
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a gas (MW=20); it isn't d/t its ability to bond to itself. Also high heat of vaporization (539 cal/g)
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What imporant properties does water have?
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1) universal solvent 2) High melting point (0), 3) high boiling point 4) high heat of vaporization 5) high specific heat 6) high surface tension
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Why is hot water a better cleaning agent?
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It has a lower surface tension d/t heat which makes it a better wetting agent (it gets into holes/pores)
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Why does water have a high heat of vaporization?
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Because of the strength of its internal h-bonds
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Why does water have a high specific heat?
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Because its H-bonds resist increasing the average kinetic energy
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What is cohension?
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The attraction of one water molecule to another
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What is adhesion?
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The attraction of one water molecule to a non-water molecule
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What is capillary action?
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Water adheres to another substance, and surface tension keeps the water together. Random motion slowly moves the water up/along the surface, dragging some of the rest of the water with it.
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Why is ice less dense than water
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Ice represents the maximal hydrogen bonding of water, in a lattice formation, which creates gaps in the water, thus making it less dense.
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What does pressure do to freezing?
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It inhibits it.
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How does water's viscosity relate to its temperature?
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As temperature increases, viscosity decreases
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What does water dissociate into?
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A hydronium ion (H3O+) and hydroxide ion (OH-)
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Does water act as an acid or a base?
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Both (called amphoterism)
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