The discipline of chemistry has made agricultural chemicals, such as fertilizer and pesticides, available to society.

which is a negative effect of these chemicals on society?

They cause pollution and thus affect the living organism.

Explanation:

The substances which are used to enhance the fertility of soil in agriculture are known as fertilizers. They may be natural or synthetic/

The examples of synthetic fertilizers are ammonium nitrate, potassium sulfate.

The substances which are used to decrease or kill the growth of pests are known as pesticides.

Example : acephate, Deet, DDT etc.

the negative effect is that they cause pollution by entering the food chains through soil or water.

They cause toxicity in the consumers or decomposers of the food chain.

Depending on the nature of the pesticide they may cause food poisoning, neural disease etc.

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).