Question

Be sure to answer all parts. The following diagram represents the results of a process. Which of the diagrams [(i) to (ii)] could represent the starting material if the process were physical? (i) (ii) (iii) () (ii) Which of the diagrams (i) to (ii)] could represent the starting material if the change were chemical? (i) (ii) (iii)

Answer 1

(1) If the process is physical, no change in physicalstate of the molecule. Figure (iii) is the starting material (2) If the process is chemical,. Figure (i) is the starting material Mass number = number of protons+ number of neutrons (a) Number of protons in Boron = atomic number of B Mass number p +n = 5 + 6 = 11 5 (b) Number of protons in Mg atomic number of Mg 12 Mass number = p n = 12 13 25 (c) Number of protons in Br atomic number of Br 35 Mass number = p + n = 35 + 44 79 (d) Number of protons in Hg atomic number of Hg 80 Mass number = p n = 80 + 119 199