Thay cthh vào phương trình chữ sau và hoàn thành phương trình hóa học a)nhôm+khí ôxi => nhôm oxit (al203)
b)sắt+lưu huỳnh =>sắt(II) sunfua(FeS)
c)khí hiđrô+khí ôxi =>nước(H2o)
d)Khí nitơ+khí hiđrô => Amoniac(NH3)

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

What is the equilibrium constant of aa+bb=cc+dd

Which piece of equipment would me most useful for measuring the volume of some water? a. pan balance b. graduated cylinder c. tweezers d. flask quick