Answer:
1) Water vapor condenses to form water droplets: a physical process.
2) It is proportional to its weight.
3) Gas
4) 115.2 °C since melting point is an intensive property
Explanation:
1) rusting of metals involves oxidation which is a chemical process
hydrogen and oxygen undergoes chemical reaction to give water
If a candy is dropped in water and releases gas then there must be some reaction going on,
thus out of the four changes, condensation of water is a physical process.
So correct answer is
Water vapor condenses to form water droplets: a physical process.
2) Mass is independent of location, It will be the same on earth or on moon,Its weight which changes with locations.
Thus the correct answer is mass is proportional to weight.
3) gas particles are neutral and they bounce off on another as they collide. the gas particles are in random motion due to high thermal energy and low intermolecular forces of attractions.
4) The intensive properties does not depend upon the mass or amount of a substance. Melting point is an intensive property and will be the same for any amount of a given substance.