Chem Is try Mystery Cache
wademercer: Time for these to retire. Feel sad that a few cachers have littered the Dfw area with thousands of poorly rated caches... all to appease a few loopers... not sure how you can brag about a hundred or more loops when most are from falsely rated caches! Also frustrating that the dfw cachers aren’t discouraging this bad behavior. I feel the north Texas geocaching association should be spearheading a movement to encourage cachers to rate their caches appropriately. To have some pride in the cachers and caches they represent. Instead, they actively participate in their Denton overrated events, and enjoy another false loop. They should be discouraging inaccurate cache ratings. Txga leadership should be modeling the best geocaching behavior for others to follow. Step up.
Cache container has been removed.
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N 32 58.875 W 0960 50.089
The cache is NOT at the posted coordinates. Yea, you have to figure
out where it is!
Chemistry Timeline
Chronology of Major Events in Chemistry through the late
1700's
Democritus (465 BC)
First to propose that matter exists in the form of particles.
Coined the term 'atoms'. "by convention bitter, by convention
sweet, but in reality atoms and void"
Alchemists (~1000-1650)
Among other things, the alchemists sought a universal solvent,
attempted to change lead and other metals into gold, and tried to
discover an elixir which would prolong life. The alchemists learned
how to use metallic compounds and plant-derived materials to treat
diseases.
1100s
Oldest written description of lodestone used as a compass.
Boyle, Sir Robert (1637-1691)
Formulated the fundamental gas laws. First to propose the
combination of small particles to form molecules. Differentiated
between compounds and mixtures.
Torricelli, Evangelista (1643)
Invented the mercury barometer.
von Guericke, Otto (1645)
Constructed the first vacuum pump.
Bradley, James (1728)
Uses aberration of starlight to determine the speed of light to
within 5%. accuracy.
Priestley, Joseph (1733-1804)
Discovered oxygen, carbon monoxide, and nitrous oxide. Proposed
electrical inverse-square law (1767).
Scheele, C.W. (1742-1786)
Discovered chlorine, tartaric acid, metal oxidation, and
sensitivity of silver compounds to light (photochemistry).
Le Blanc, Nicholas (1742-1806)
Invented process for making soda ash from sodium sulfate, limestone
and coal.
Lavoisier, A.L. (1743-1794)
Discovered nitrogen. Described the composition of many organic
compounds. Sometimes regarded as the Father of Chemistry.
Volta, A. (1745-1827)
Invented the electric battery.
Berthollet, C.L. (1748-1822)
Corrected Lavoiser’s theory of acids. Discovered bleaching
ability of chlorine. Analyzed combining weights of atoms
(stoichiometry).
Jenner, Edward (1749-1823)
Development of smallpox vaccine (1776).
Franklin, Benjamin (1752)
Demonstrated that lightning is electricity.
Dalton, John (1766-1844)
Proposed atomic theory based upon measurable masses (1807). Stated
law of partial pressure of gases.
Avogadro, Amedeo (1776-1856)
Proposed principle that equal volumes of gases contain the same
number of molecules.
Davy, Sir Humphry (1778-1829)
Laid foundation of electrochemistry. Studied electroysis of salts
in water. Isolated sodium and potassium.
Gay-Lussac, J.L. (1778-1850)
Discovered boron and iodine. Discovered acid-base indicators
(litmus). Improved method for making sulfuric acid. Researched
behavior of gases.
Berzelius J.J. (1779-1850)
Classified minerals according to their chemical composition.
Discovered and isolated many elements (Se, Th, Si, Ti, Zr). Coined
the terms 'isomer' and 'catalyst'.
Coulomb, Charles (1795)
Introduced the inverse-square law of electrostatics.
Faraday, Michael (1791-1867)
Coined term 'electrolysis'. Developed theories of electrical and
mechanical energy, corrosion, batteries, and electrometallurgy.
Faraday was not a proponent of atomism.
Count Rumford (1798)
Thought that heat was a form of energy.
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