Đốt cháy hoàn toàn 6,2 g photpho trong oxi dư. Cho sản phẩm tạo thành tác dụng vừa đủ với dung dịch NaOH 32% tạo ra muối Na2HPO4. a) Viết phương trình hóa học của các phản ứng xảy ra.

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this

Arrange the elements in order of increasing electronegativity. use the periodic table to you arrange the elements. p o k mg

Generally, observed behavior that can be formulated into a statement, sometimes mathematical in nature, is called a(n): a. observation. b. measurement. c. theory. d. natural law. e. experiment.