3. What are these phenomena (physical or chemical):
a) melting magnesium;
b) burning magnesium;
c) the dissolution of magnesium in sulfuric acid;
d) melting of sulfur;
e) burning of sulfur;
e) evaporation of alcohol;
g) burning alcohol;
h) the conversion of chalk into powder?

Ответ:

a) physical

b) chemical

c) chemical

d) physical

e) chemical

f) physical

g) chemical

h) physical

Объяснение: