bio ch 3

Water is a good solvent due to its _________ nature

water is a polar molecule, which means it has an _______ distribution of charge

water is shaped like a "_"

which has a slight - charge, oxygen or hydrogen

which has a slight + charge, oxygen or hydrogen

what is the bonding together of like molecules to hold a substance together?

when water was sticking to the penny - water bonds to other molecules

occurs when the adhesion of the wall of plants/capillary tube is stronger than the cohesive forces of water (both are required)

why roots of plants work how they do can be described by __________ action

a measure of how difficult it is to stretch or break the surface of a liquid

water has a _____ surface tension due to hydrogen bonding

the amount of heat that must be absorbed/lost for 1 g of that substance to change its temperature by 1 degree C

surface ________ allows organisms to live on _______

specific heat is important to humans during the winter in nebraska because... people are mostly made of _______ so you won't freeze because water has a high specific heat capacity

the quantity of heat a liquid must absorb for 1 g of it to be converted from the liquid to the gaseous state

as liquid evaporates, the surface of the liquid that remains cools down (this is also why sweating cools the body)

solid water is _____ dense than liquid water

water is most dense at _ degrees C (at the bottom of every lake, no matter the time of year) (you have to know this!!!)

water being densest at 4 degrees C causes ______ ____________

lake turnover causes n_________ movement

water is a universal solvent but don't call it that, call it a ______ solvent

like dissolves like, it dissolves other polar things, this is due to its _______ nature

a liquid that is a completely homogeneous mixture of two or more substances

dissolving agent

substance (stuff) being dissolved

water mixed with koolaid, water is the ______, koolaid is the _____

we call H+ a

we call OH- a

a substance that increases the H+ (hydrogen ion) concentration of a solution

a substance that reduces the H+ (hydrogen ion) concentration

on the pH scale, the numbers always add to ___

if H+ = 10^-1, then OH- = what?

on the pH scale, 1 is __ times more acidic than 2

a substance that minimizes changes in the concentration of H+ and OH- in a solution

buffers prevent large changes in what?

_________ acid is a good buffer

molecule that does not have an affinity for water... non polar, oil as an example

molecule that does have an affinity for water... polar

how the properties of water are significant to living organisms... water is t_________ which allows aquatic plants and phytoplankton to photosynthesize

(talking about one water molecule here): hydrogen and oxygen atoms are held together by __________ bonds

a water molecule is ________ because electrons are not shared equally

because of its polarity, water can __________ most substances, and because of this it is referred to as a ______ __________

when water changes from a liquid to a gas

when water changes from a gas to a liquid