20 points
If you examine a piece of hail, it might have invisible layers like an onion.
Which answer best explains why this is true?
O
As hail falls, it picks up layers of dust and dirt from the air.
Hail forms layers because it melts as it falls towards the Earth.
O
Air pressure increase while the hail falls and it causes ice layers to form.
Hail builds up ice layers as it travels through updrafts in a storm before it falls.

Infants born with severe respiratory problems are sometimes given liquid ventilation: they breathe a liquid that can dissolve more oxygen than air can hold. one of these liquids is a fluorinated compound, cf3(cf2)7br. the solubility of oxygen in this liquid is 66 mlo2 per 100 ml liquid. in contrast, air is 21 % oxygen by volume. calculate the moles of o2 present in an infant's lungs (volume: 12 ml ) if the infant takes a full breath of air. assume a pressure of 1 atm in the lungs.

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

The molecular weight of carbon dioxide, co2, is 44.00 amu, and the molecular weight of nitrous dioxide, no2, is 46.01 amu, so no2 diffuses co2