Cho v lít dung dịch HCL có pH=3 a) Tính nồng độ mol các ion H+, OH- của các dung dịch b) Cần bớt thể tích nước bằng bao nhiêu v để thu được dung dịch có pH=2 c) Cần thêm thể tích nước bằng bao nhiêu v để thu được dung dịch có pH=4

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

Many ionic compounds and a few highly polar covalent compounds are because they completely ionize in water to create a solution filled with charged ions that can conduct an electric current.