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35 Cards in this Set
- Front
- Back
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Water molecules can make up to _-_ bonds
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4-H
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the force of H bonding holds water molecules together.
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cohesion
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the force of H=-bonding allows water to cling to substances
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adhesion
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elasticity of a liquid's surface.
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surface tension
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water__ heat from wamer air
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absorbs
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water __ stored heat to cooler air.
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releases
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the energy of motion, the faster it moves the more it has.
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Kinetic energy
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the measure of the total kinetic energy due to moleculat motion
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heat
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measures the intensity of heat in a body of matter due to the average kinetic energy.
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Temp
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Molecules in teh cooler object __ __ at the expense of kinetic energy in the warmer object.
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speed up
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the amount of heat necessary to raise the temp of 1 gram of water 1 C.
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one calorie
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the amount of heat that must be absorbed for 1 gram of any substance to change its temp 1 C.
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specific heat
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the amount of heat a liquid must absorb for 1g to be cnverted from liquid to gas.
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heat of vaporization
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the heat of vaporization of water is high bc of all of the __ __
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hydrogen bonds.
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these H-bonds must be broken before the molecules can escape as a __
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gas
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water is __ dense as a solid than liquid.
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less
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above _ C water expands as it warms and contracs when cooled.
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4
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water freezes at _ C when its molecules can no longer break their H bonds
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0
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a liquid that is completely homogenous mixture of 2 or more substances.
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solution
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the dissolving agent of a solution
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solvent
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the substance that is dissolved
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solute
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__ is the primary solvent in cells
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water
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only those substances that are __ or __ will dissolve readily in water ( even large molecules like proteins)
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ionic or polar
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water loving( polar)
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hydrophilic
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a substance that is non polar and will not dissolve readily in water
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hydrophobic
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1 mole=
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6.02x10^23
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C12H22O11: molecule mass=342 daltons.
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1 mole
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the concentration of a substance is __ of solvent
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1 liter
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when a H atom leaves its electron behind and a single proton, with a charge of 1+ is transferred, this is called __
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hydrogen ion
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the water molecule that lost a proton is now called a __ _
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hydroxide ion
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the water molecule that has gained the proton is called a __ _
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hydronium ion
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__; increase the H+ concentration
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acids
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__; reduce the H+ concentration
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bases
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substances that resist changes in pH
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buffers
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the primary cause of acid rain is
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burning of fossil fuels
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