Chemistry is a basic natural science, which is of great significance to human beings and has a great relationship with life. It is true that chemistry plays an important role in making up lessons for our whole human health and development, but at the same time, we should also see that chemistry has also had a negative impact on human health to some extent.
First of all, let's look at the positive effects of chemistry on human beings.
The positive effect of chemistry on human beings is most directly manifested in its influence on food, clothing, housing and transportation. It is the transition from warm to well-dressed, and then to warm and well-dressed, and chemistry plays an important role in this process. Nylon, a kind of resin with amide bond in its molecule, is not found in nature and needs to be obtained by chemical methods; Polyester, a kind of fiber synthesized from ethylene glycol and dimethyl terephthalate.
Food is the most important thing for people. Now people not only pay attention to eating well, but also require eating well and eating healthily. No matter in a person's growth and development stage or at the end of his life, some trace elements or substances are needed to maintain life activities. Steamed bread made of soda dough is soft and delicious. All kinds of drinking wine are made from grain and other raw materials through a series of chemical changes. Betel nut is a favorite food of ethnic minorities. Before eating, it must be soaked in hydrated lime and cut into small pieces. It takes some time to eat. In addition, various seasonings (most obviously salt) or foods obtained by chemical means have a far-reaching impact on human diet health.
As for housing, chemistry has provided more building materials for mankind, which has made the construction industry advance by leaps and bounds in the past two hundred years. The quicklime is soaked in water to make the lime mature, and the hydrated lime is dried on the floor into white hard calcium carbonate, which covers the yellow of the soil and makes the house look neat and bright. Only when steel is chemically refined can we use iron products. Only by chemically processing petroleum can we use lightweight plastics. Chemical calcination of clay can make the house have a beautiful tile surface. Chemistry can not only make people live well, but also live more safely.
In fact, chemical reaction is the driving force of the vehicle. Without the heat released by fuel combustion, the vehicle cannot start at all. Chemical energy is the most primitive source of energy for their actions. Even with electricity as power, we can't forget the great contribution of chemical energy. At present, chemistry is still a means of transportation and plays an important role in people's travel. We can imagine that if there is no chemistry, there will be no development of modern science and technology, and the means of transportation will remain in the oldest carriage and walking, and flying, trains and ships are even more unimaginable.
In terms of human health, chemistry can provide a more comfortable living environment for human beings, which can make us cool in summer and warm in winter. Chemistry has effectively prevented the further deterioration of the disease through the development of various drugs in time. Therefore, the contribution of chemistry in the field of medicine and health can not be ignored. This is also one of the most important roles that I think chemistry plays in the development of human civilization.
Of course, chemistry has so many beneficial effects on human beings, but at the same time, chemistry also has many adverse effects on human health.
The first thing that stands out is the problem of environmental pollution. With the development of industrial society, more and more economic growth depends on the support of chemical industry, which is bound to further cause industrial energy shortage, environmental pollution and ecological destruction. Nowadays, it is difficult for us to see a clear river, blue sky and primitive grasslands and forests. Acid rain always threatens the environment on which we live. The discharge of various toxic gases, waste liquid and waste residue is harmful to people's eating, drinking, living and walking, and chemistry can affect human health through these ways.
Then, the burning of a large number of carbon-containing fuels not only destroys vegetation, but also intensifies the greenhouse effect, which makes the global climate warm and the sea level rise, and the living environment of various animals and plants suffers great changes and ecological imbalance.
Although the chemical fertilizer in agricultural production has promoted the bumper harvest of crops, the pesticides left on crops are extremely harmful to human health. The "Sudan Red" incident, which caused an uproar a few years ago, shows that chemistry has also been used by lawless elements in the process of development, endangering people's lives. Various detergents in life will also cause different degrees of harm to the human body during use.
Chemistry is a double-edged sword, so we should treat it with caution.