Câu 1: Trình bày phương pháp hóa học nhận biết a. 3 dung dịch: HCl , Na2SO4 , NaCl.
b. 3 dung dịch:NaOH , NA2CO3 , NaCl.
c. 4 dung dịch:HCl , H2SO4 , NaCl , Na2SO4.
Viết phương trình phản ứng xảy ra (nếu có)

This is a mixture that has the same composition throughout.

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.

How do you lengthen a pattern piece? (family and consumer science, sewing)