1.The most important merits are it's use in the day-to-day life.
2.Chemistry led to the improvement in the medical sector.
3.It led to the making of tablets, and the scans, and many others things, in the medical sector.
4.The invention of plastics, and synthetic fiber led to the start of the modern world.
1.Though the tablets are made, it have too many side-effects too. Over-dosage of tablets will kill any life.
2.The uses of excessive fertilizers not only kills humans, but also the marine life, when the field is washed out, the chemicals will mix with the nearby water sources.
3. Also, most importantly, the plastics spoils the environment, and it's cleanliness, and the nature.
Hope this will help you.