Chapter 3 UTA

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hydrogen bonds that hold water together

cohesion
the clinging of one substance to another

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

Surface tension
the energy of motion

kinetic energy
the measure of the total amount of kinetic energy due to molecular motion in a body of matter

heat
the measure of intensity of heat due to the average kinetic energy of molecules

temperature
the amount of heat it takes to raise the temperature of 1g of water by 1C.

calorie
Measure of the ability of a substance to resist changes in temperature.
The amount of heat that must be absorbed or lost for 1g of waterto change its temp by 1C.

specific heat
the quantity of heat a liquid must absorb for 1g of it to be converted
from liquid to gas. Hydrogen bonds must be broken so some of the energy
is expended on the breaking ofbonds.

heat of vaporization
a completely homogeneous mixture of 2 or more substances

solution
the dissolving agent of a solution

Solvent
the substance dissolved in a solution

solute
a solution where water is the solvent

aqueous solution
what is a strong electronegative element?

oxygen
what is the type of covalent bond between oxygen and hydrogen

polar
Is the strong cohesive forces between liquid molecules.

Surface tension. H2O has a high surface tension
What must happen for water temp to rise

Hydrogen bonds must be broken by result of an input of energy. More energy must be used in order to heat up water than other liquids because some of the energy must be used to break the bonds.
what happens when more hydrogen bonds are formed thus releasing energy

water is cooling. The released energy tends to resist drops in temp
maximum water density occurs at what temp?

4C, caused by hydrogen bonds seperating water molecules in a structured way when water is ice. This is why ice floats.
Molecules that interact or dissolve in water and from hydrogen bonds.

Hydrophilic
molecules such as fat that do not dissolve in water due to the molecules not being able to form hydrogen bonds.

Hydrophobic/nonpolar
when is water considered in equilibrium?

H2O1H^3 and OH^-.
scale that indicates the concentration of H^+ in water or 7 on the scale
- PH scale
- 7+=acidic.
- 7=akaline
the rate that many chemical reactions occur

Definition of PH
weak acids and bases that resist changes in PH
- Buffers
- Carbonic acid->Bicarbonate ion + hydrogen ion

Author

qwalkley

212012

Card Set

Chapter 3 UTA

Description

biology

Updated

2013-04-09T00:55:43Z

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