Among the listed phenomena, indicate physical and chemical: a) the formation of icicles on the roofs;

Among the listed phenomena, indicate physical and chemical:
a) the formation of icicles on the roofs;
b) the formation of black plaque on a silver product;
c) fermentation of grape juice or jam

a) the formation of icicles on the roofs; Physical phenomenon.
b) the formation of black plaque on a silver product; Chemical phenomenon.
c) fermentation of grape juice or jam; Chemical phenomenon.
d) extinguishing soda with vinegar; Chemical phenomenon.
e) evaporation of acetic acid; Physical phenomenon.
f) the spread of the smell of perfumery products. Physical phenomenon.

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