What are chemical contaminants? 1)Homemade soaps.
2)Restaurant grade cleaners.
3)Alcohol.
4)Recreational drugs.

Chemical contaminants are chemicals toxic to plants and animals in waterways. The phrase 'chemical contamination' is used to indicate situations where chemicals are either present where they shouldn't be, or are at higher concentrations than they would naturally have occurred.

for respect usually. some people might be little awkward if you meet or some would be different. usually   you dont love people when you meet them depends on the type of person.

hope this