Nêu hiện tượng khi cho bột iron (III) oxide (Fe2O3) vào dung dịch sulfuric acid (H2SO4). Chọn câu trả lời đúng nhất

Which of the following contributes to the structural rigidity of cellulose? adjacent glucose polymers are stabilized by hydrogen bonding. glucose residues are joined by (α1→4) linkages. cellulose is a highly branched molecule. the conformation of the glucose polymer is a coiled structure.

What is the molarity of the solution produced when 145 g of nacl is dissolved in sufficient water to prepare 2.75 l of solution?

How can the number of core electrons be determined from the periodic table