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ECHEM Exam 1 Terms and def
Chapter 3 material
34
Chemistry
Undergraduate 4
09/18/2013

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Term
The hydrologic cycle
Definition
dynamic relation of water between the oceans, atmosphere, ice and snow, plus surface and ground water
Term
What is the water use in the US
Definition
46% Industrial
46% Agricultural
8% Municiple
Term
Hydrology
Definition
the study of water
Term
Limnology
Definition
characteristics of freshwater including biological, chemical and physical properties
Term
oceanography
Definition
characteristic of seawater including biological chemical and physical properties
Term
What is the average bond length of a covalent O-H bond?
Definition
0.99 A
Term
What is the average bond length of a hydrogen bond?
Definition
1.77 A
Term
What is a good estimate of bond strength?
Definition
Bond length
Term
At what temp is water most dense?
Definition
4 C
Term
Why does water expand when it freezes?
Definition
Water expands when it freezes because of the lattice 4:1 H:O hexagonal occurence that makes it less dense than liquid water
Term
Dielectric constant
Definition
the ability to allow ions to exist singularly
Term
Properties of Water:
High dielectric constant
Definition
Environmental effect:
-able to ionize substances
-increase solubility
-increase mobility
Term
Properties of Water:
High surface tension
Definition
Environmental effect:
-Results from h-bonding
-governs drop and surface phenomena
Term
Properties of Water:
Excellent solvent
Definition
Environmental effect:
Transport nutrients
transport waste product in infrastructure
Term
Properties of Water:
Max density at 4C
Definition
Environmental effect:
-Ice floats, prevents lakes from freezing solid
Stratifies lakes
Term
Properties of Water:
high heat of evaporation
liq->vapor
Definition
Environmental effect:
-Temp stabilization at phase change
Term
Properties of Water:
High latent heat of fusion
Definition
Environmental effect:
-Temp stabilization at phase change
Term
Properties of Water:
High heat capacity
1 cal per gram per degree
Definition
Environmental effect:
-Stabilizes water temp to avoid shock
-Stabilizes geographic regions
-provides stable environment for aquatic organisms
Term
Oligotrophic
Definition
deep clear lakes, Low amounts of nutrients. low bioactivity
Term
euthrophic
Definition
more nutrients, supports some life, and more turbid
Term
Dystrophic
Definition
shallow lakes, abundant plant life, colored water
Term
What does colored water indicate?
Definition
Reducing enviroment
Term
Wetlands
Definition
Shallow enough for plant roots
Term
What do wetland systems do?
Definition
Toxic remediation of metals by plants
Term
Explain solubility of gases in water.
Definition
Solubility of gas is inversely proportional to temperature
Term
euthrophic
Definition
more nutrients, supports some life, and more turbid
Term
Dystrophic
Definition
shallow lakes, abundant plant life, colored water
Term
What does colored water indicate?
Definition
Reducing enviroment
Term
Wetlands
Definition
Shallow enough for plant roots
Term
What do wetland systems do?
Definition
Toxic remediation of metals by plants
Term
Biochemical oxygen demand (BOD)
Definition
the amount of dissolved oxygen that must be present in water in order for microorganisms to decompose the organic matter in the water, used as a measure of the degree of pollution.
Term
Krast topography
Definition
A landscape that is characterized by numerous caves, sinkholes, fissures, and underground streams. Usually forms in regions of plentiful rainfall where bedrock consists of carbonate-rich rock that is easily dissolved.
Term
Explain krast topography in Florida
Definition
[image]
Term
alkalinity
Definition
-capacity to accept H+
-Generallt high [dissolved solids] and high pH
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