October 13, 2007
Water is an unusual molecule that has very specific physical and chemical properties.
It is important to know the differences between physical and chemical properties of matter.
Physical properties do not change the molecular structure; chemical properties changes the structure that is the pattern of the chemicals bonds of the original substance matter to form another pattern and a new structure.
An example of water’s physical property is ice ( solid water) melting to form liquid water. The molecular structure never changes. A chemical water property would be changes made by breaking the chemical bonds that held the original water molecule into two different molecules H2 (hydrogen gas) and O2(oxygen gas). In the class room, using electricity students can observe how the water molecule undergoes a chemical change.
There is an interesting water quiz that the USGS site. This site has facts that will be helpful in understanding how special Water is. here is the site: http://ga.water.usgs.gov/edu/sc3.html
October 9, 2007
Found this article on estuaries. Facts about stuaries are important because they relate to flow rates:
“Water circulation characteristics may also be used to classify different types of estuaries. The movement of water in estuaries is regulated by the ebb and flow of tides; differences in the density of water; and wind. Because most estuaries are influenced by lunar tides, the once-daily (diurnal) or twice-daily (semidiurnal) rise and fall of water results in a net flow out of the estuary. In the strictest sense, estuarine circulation usually refers to the residual water movement after the short-term tidal effects are removed. Thus, circulation is the time-averaged current in an estuary and is sometimes described as net current, nontidal flow, or tidal residual.
The density of water also plays a major role in the movement of water in estuaries. Density, which is the weight per unit volume of water, increases with increasing salinity and decreasing temperature. In an estuary, the lighter fresh water mixes with the heavier salt water from coastal waters and creates a gradient in water density in the estuary. As the fresh water gains salt, becomes heavier, and sinks, the resulting movement of water is known as gravitational circulation, and is caused by density and elevation differences between the fresh-water runoff and saltier coastal waters. In some estuaries, large differences in water temperatures can also drive gravitational circulation”
October 6, 2007
These two water pictures are related? Read the color blocks on the right.
What do you need to analyze these pictures? Are observations reliable?
How would you improve this question? How can you use the scientific method to develop a research project?
What do you think that they mean.
Read the color blocks on the right.
Turbidity Can you assign a measurement value?
Describe what you see.
Create a rating scale of how clear the water is in these beakers.
Is this a real, reliable, and valid observation.
Does your water body look like this one?
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