CHEMISTRY · Subjective · CBSE · Chemistry · Is Matter Around Us Pure? · Is Matter Around Us Pure?
Problem
Classify each process below as a physical change, a chemical change, or ambiguous. Report the category for every lettered item in one sentence.
(i) melting sulfur
(ii) electrolyzing liquid water to produce H₂(g) and O₂(g)
(iii) subliming dry ice (CO₂)
(iv) dissolving NaCl(s) in water