Determine which type of property each statement describes by typing "physical" or "chemical" in the blank, Hydrogen is a colorless, tasteless, and odorless gas, 1
Hydrogen is very combustible in the presence of oxygen,
Hydrogen is very reactive with most elements,
Hydrogen is the least dense of all elements,

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

answer carbon and three oxygen atoms;