properties of water
in order to evaporate, water must break its ___ bonds
hydrogen
list 5 ways that water helps maintain homeostasis
makes a good insulator, resists temp. change, universal solvent, coolant, ice protects against temp. extremes (insulates frozen lakes)
where will it take longer for an egg to boil: death valley or mt everest?
mt everest
water is a ____ molecule because it has an equal number of ___ and ____
neutral; electrons; protons
which atom in water attracts more negative electrons?
oxygen
water is called a ____ molecule because the oxygen end "acts" ____ charged and the hydrogen end "acts" _____ charged.
polar; negative; positive
water _____ a change in temp. and can absorb or release ____ amounts of energy w/ very little temp. change
resists; large
plants absorb water through their ___ and use ___ action or _____ to move water upward against gravity to the leaves
roots; capillary; transpiration
name 2 other things observed in nature that are the result of adhesion
straw; water droplets on glass
cohesion produces ____ ____ when one water molecule attracts other ____ molecules
surface film, water
what is surface tension a measure of?
the strength of the water's surface
what process in plants is due to capillary action?
transpiration
which is denser- ice or water?
water
why does ice float in water
water is less dense as a solid
how does water warm the earth
water vapor
how does adhesion DIFFER from cohesion?
water will make hydrogen bonds with other surface es such as glass, soil, plant tissues, and cotton
one hydrogen bond is ____, but many hydrogen bonds are ____
weak; strong
what happens to the boiling point of water at higher elevations where the atmospheric pressure is less?
decreases at higher elevations
in order for a gram of water at 100 c to change into steam at that same temp. it must ___ __ calories of energy.
gain 540
what is the formula for a molecule of water?
h2o
when water evaporates from a surface, it removes a lot of ____
heat
what is water's net charge?
0
at sea level, water boils at ___ celsius and freezes at ___ celsius
100; 0
what is waters heat of vaporization?
540 cal/g
define homeostasis
ability to maintain a steady state despite changing conditions
what is heat of vaporitzation
amount of energy it takes to convert from liquid to a gas
define specific heat
amount of heat needed to raise or lower 1 gram of a substance 1 celsius
what is cohesion?
attraction between particles of the same substance (why water is attracted to itself)
what is adhesion?
attraction between two different substances
how do hydrogen bonds form?
between a highly electronegative atom of a polar molecule and a hydrogen
which would contain more energy at 100 c, steam or boiling water?
boiling water
adhesion produces ___ ____ as water is attracted to and pulled into a tube
capillary action
name 5 more properties of water that are important to all life
cohesion; adhesion; high specific heat; high heat of vaporization; less dense as a solid
frozen water forms ____ holding the molecules at fixed distances from each other
crystal-like lattice
