Indicate whether these observations are most likely evidence for a physical or chemical change. (a) Steam condenses to a liquid on a cool surface. (b) Baking soda dissolves in vinegar and create a fizz. (c) Mothballs gradually disappear at room temperature. (d) Mercury cools to 40C forming a liquid. (e) Steel wool forms blue-black beads upon heating (f) Sulphur and iron powders mix together. (g) Iron and sulphur powder change colour and texture upon heating together. (h) Silver deposits on a copper wire in a silver nitrate solution. (i) Lead nitrate and hydrochloric acid solutions produce an insoluble substance upon mixing. " physical It chemical " physical * physical : physical : chemical : physical : chemical * chemical