銅礦

黃銅礦 Chalcopyrite CuFeS2
孔雀石(銅綠)(鹼式碳酸銅) Malachite CuCO3．Cu(OH)2
靛銅礦 Covellite CuS
輝銅礦 Chalcocite Cu2S
藍輝銅礦 Digenite Cu9S5
赤銅礦 cuprite Cu2O
斑銅礦 Bornite Cu5FeS4
砷黝銅礦 Tennantite Cu12As4S13


http://en.wikipedia.org/wiki/Chalcopyrite
http://wapedia.mobi/zh/%E9%8A%85
http://baike.baidu.com/view/381638.htm

the weather is strange

The weather is strange these days in Taiwan. It was pouring down this morning around 6 am. Fortunately, it stopped when I went to school. It rained heavily again for about one hour. The air was crisp then. At noon, it was getting balmy. In the evening, it's chilly. The significant temperature difference reminds me of Egypt, the desert, and the end of the world.
Today is not unusual among this year. It supposed to be spring or at least getting warmer to wear short-sleeved. It's not. It was once or twice over 30 ℃ after Chinese New Year. It feels like endless winter now. Flowers were deceived by the weather. Everyone get confused as well.

Why does "like dissolves like"?

It is generally believed that "like dissolves like". It means polar solute dissolve in polar solvent, while non-polar solute tend to dissolve in non-polar solvent. According to the van der Waals force, does permanent dipole-induced dipole forces larger than London dispersion force?

From thermodynamics, G=H-TS, not only the enthalpy but the entropy changes the Gibbs free energy. For polar system, positive and negative charges attract on another. However, in non-polar system, weak attractions between solute and solvent molecules make the entropy dominant.

What happens when non-polar and polar molecules are added together? Polar molecules tend to bind each other and push non-polar molecules out of the way.

影響溶解度的原理：
1. 分子間的吸引力
2. 系統的亂度


ref:
http://www.scribd.com/doc/6402856/24-CHEMISTRY-LESSONS
http://www.chalkbored.com/lessons/chemistry-12/study-note-2-20.pdf