What type of molecular interaction would be formed between multiple methyl groups in separate R-groups

pure substance: iron,copper

impure substance: water,charcoal

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.

so she was walking and she stepped on warm jeffy , uh uh uhh dadye i just pooped my pants