Only question 1 and 2 pls

1- I would say you are correct because every object has a boiling point where it starts to boil. Water boils at 212 degrees Fahrenheit. When water boils it turns into water vapor.

2-If a molecule is moving fast enough and at the surface of the water, it will escape into the gas phase. That’s evaporation. The warmer the water is, the more molecules have the energy necessary to escape. So hot water evaporates faster than cool water, all other factors being equal.

If the air around it is warmer than the water will set to room temperature making the boiling process take less time

Explanation:

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.