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