cho 53,2g kim loại kiềm M vào 50g dung dịch HCl 36,5%. cô cạn dung dịch sau phản ứng thu được chất răn X có khối lượng 67,4g. vậy kim loại kiềm là

The most efficient way to establish the best possible economizer position is to measure

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

Which of the following did jj thompson discover about atoms? a)an atom has an internal structure. b) atoms are tiny indivisible particles. c)electrons orbit the nucleus of an atom. d) the nucleus of an atom contains protons and neutrons.