Trong các chất sau, có bao nhiêu chất vừa tan trong dd HCl , vừa tan trong dd NaOH: Na, Al, Fe, Al(OH)3, Cu, ZnO, CaCO3, Ba, Mg, Al2O3, CuSO4, Zn(OH)2.

- decrease the number of plants and animals living in the water.

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.

5.6⋅10−^19  j

do you need the explaination?