POW Quiz

POW Quiz

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Question Answer
what is a water molecule made up of? H20; one oxygen and two hydrogen
Is water polar? yes; oxygen acts as negative hydrogen acts as positive.
Is water neutral? yes; equal amount of e- and p+—- Zero Net charge
what is a polar molecule A compound with one negativily charged side and one positivly charged side.
What exisits between water molecules? hydrogen bonds; formed between highly electronegative atom of a polar molecule and a hydrogen.
One hydrogen bond is ____ but many of them are ____ weak,strong
How is a hydrogen bond formed? Negative oxygen end of one molecule is attracted to the positive hydrogen end of the oxygen molecule.
At sea level, when does pure water boil and freeze? boil- 100 degrees celciusfreeze- 0 degrees celcius
The boiling temprature of water ____ at higher elevations decreases, lower atmospheric pressure
Will an egg take shorter or longer to boil at higher alttitudes? longer
What is cohesion? water molecules stick to eachother
What does cohesion result in? surface tension.
What is surface tension? strength of waters surface
What does surface tension allow? produces a surface film on water that allows insects to walk on the surface of water.
what is adhesion? attraction between two different substances. (water molecules stick to other materials)
water makes ______ _____ with other surfaces such as glass. soil, plant tissues, and cotton. hydrogen bonds.
what is capillary action? the ability of water to move upward, against gravity, through small openings.
whats an example of capillary action? Move through the roots of plants and through the tiny blood vessels in our bodies) also…process in which plants and trees remove water from soil, and paper towels to soak up water.
____ causes capillary action ADEHESION, polarity, and cohesion
amount of heat needed to raise or lower 1g of a substance 1 degrees celcius. high specific heat.
water _____ temprature change both for heating and cooling. resists
specific heat index water can absorb lots of heat before it begins to get hot.
water can absorb or realease ___ amounts of heat energy with ___ change in actual tempreture. large,little
amount of energy to convert 1g or a substance from liquid to gas. high heat of vaporizization
In order to evaporate what must be broken? hydrogen bonds.
As water evaporates it moves a lot of ____ with it. heat
what forms a global blanket to keep the earth warm? water vapor
ice is ____ dense as a ____ then as a ____ solid, liquid.
liquid water has hydrogen bonds that are constantly being ___ and ____. broken, reformed.
frozen water forms a _____ ____ ____ whereby molecules are set at fixed distances. crystal like latice.
what process is water important to? homeostasis
why is water important to homeostasis? makes a good insulator, resists temprature change, universal solvent, coolent, temprature extremes (frozen lakes)
what is a universal solvent? A universal solvent is a substance that dissolves most chemicals. Water is called the universal solvent because it dissolves more substances than any other solvent.
What are the two types of mixtures? solutions and suspensions
solutions and suspensions are two types of _______ that both contain ______. universal solvent, water
solute substance being dissolved
solvent substance in which the solute dissolves
suspension solutions that dont dissolve but seperate into tiny peices
_____ keeps the peices _____ so that they dont settle out. water, suspended
What is this equation: H20–>H+ + OH dissociation (seperation)
H20 hydrogen ion acid
H+ + OH hydrogen ion base
ph of 7 is… neutral
ph of 0 up to 7 is.. acid
ph above 7-14 is…. basic
What acids have a ph of 1-3 strong acids
what does the ph scale range from? 0-14
each pH unit represents a factor of ___X change in concentration. 10X (ph of 3 is 1000 times stronger than a pH of 6)
Acids produce a lot of _____ ions, while bases contain a lot of _____ ions. H+, OH
What bases have a pH of 11-14 strong bases
____ is a measure of the hydorgen ion concentration of a solution. pH
weak acids or bases that react with strong acids or bases to help prevent sharp, sudden changes in pH buffers
buffers are produced ____ by the body to maintain _____ naturally, homeostasis.
what process in plants is due to capillary action? transportation
what does a ph of 7 mean neither acidic or basic (pure water)

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