có 1 hh gồm 5 kim loại al mg fe cu ag dùng pphh để tách riêng từng chất để khối lượng không đổi . Viết PTHH xảy ra trong lúc tách

Which of the following has wavelength longer than the wavelength of viable light? a) x rays b) gamma rays c) radios waves d) ultraviolet waves

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

Which order shows the levels of organization from largest to smallest? organism, organ system, cell, organ, tissue organism, tissue, organ system, organ, cell organism, organ, organ system, cell, tissue organism, organ system, organ, tissue, cell