CHEMISTRY · Subjective · AP · Chemistry · Chemical Reactions · Chemical Reactions
Problem
Consider the following macroscopic processes:
(i) tearing a sheet of aluminum foil
(ii) burning a magnesium ribbon in air
(iii) crystallizing CuSO₄·5H₂O(s) from an aqueous solution
(iv) decomposing KClO₃(s) on heating to release O₂(g)
Determine the number of these four processes that are chemical changes.