Which of the following factors determines how harmful an introduced chemical will be on the environment?
a type of chemical
b. concentration
C. weather conditions
d. all of the above

D.

Explanation:

Example “Chlordane” like compounds; very toxic, but are polymerized in sunlight into an insoluble goo that is (less) harmful until it is a hard, flexible material.

Although this is used at full strength, most compounds are diluted, and less toxic.

chemistry sucks a**

explanation:

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.