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Chapter 3 Water and Life
Bio 10th edition, 1406
26
Biology
Undergraduate 1
10/09/2014

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Term
What are the emergent properties of water?
Definition
water is cohesive and adhesive
Term
What is adhesion?
Definition
force of attraction of molecules of different types
Term
What is cohesion?
Definition
Force of attraction of molecules of the same type
Term
What is surface tension?
Definition
a measure of how difficult it is to stretch or break the surface of liquid
Term
Why does water have a great surface tension?
Definition
Because on the surface touching the air bonds become closer together bc water does not like to associate with air/break
Term
What is so unique about the moderation of temp of water
Definition
water can absorb and release a large amount of energy with a slight change in temperature
Term
What is thermal energy?
Definition
Energy associated with the random movements of atoms or molecules
Term
What is temperature?
Definition
measure of energy that represents the average kinetic energy of the molecules in a body of matter, regardless of volume
Term
What is a Calorie?
Definition
amount of heat required to raised the temp of 1g of that substance to change its temp by 1 degree C.
Term
Why does does water have a high specific heat
Definition
because of the presence of hydrogen bonds
Term
What do h20 bonds do constantly?
Definition
they constantly break and reform
Term
What happens when water goes from 4 to 0C
Definition
The h2o bonds slowly form and reform and when it hits 0C the bonds lock together the farthest they can without breaking, the size increases but the density decreases.
Term
What is a solution?
Definition
a liquid that is completely homogenized between two different substances
Term
What is a colloid?
Definition
A homogenized/noncrystallized substance that does not settle and cannot be seperated by ordinary means
Term
What is a Solute?
Definition
The substance being dissolved
Term
What is a solvent?
Definition
dissolving agent (fluid)
Term
What is an Aqueous Solution?
Definition
A solution where solvent is water
Term
What is a hydrophilic substance?
Definition
Any substance that has an affinity for water
Term
What is a hydrophobic substance?
Definition
Any substance that does not have an affinity for water (mostly nonpolar bonds)
Term
What is a solute concentration?
Definition
number of solute molecules in a solute solution
Term
What is molecular Mass?
Definition
Sum of masses of all the atoms in a molecule
Term
What is (M) molarity?
Definition
The number of moles of solute per 1 liter of solution ( 1 (M) of NaCl=29g)
Term
What is a Mol?
Definition
An exact number of objects 6.02x1023 avogadros number
Term
What is an acid?
Definition
Any substance that releases H+ ion in a solution
Term
What is a base?
Definition
any substance that reduces H+ ion in a solution
Term
What is Buffer?
Definition
Substance that minimizes changes in the concentration of H+ and OH- in a solution
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