Knowledge points of chemistry and life in junior high school

This section includes synthetic materials and their applications, the influence of synthetic materials, the important role of identifying various fibers and elements in human health, the important role of six nutrients in life, and the influence of toxic substances on human health. Knowledge is easy to understand, but there are many things to remember, so remembering this knowledge is the key to learning this section well.

The nutritional functions and main functions of 1, protein, sugar, oil, inorganic salts and vitamins.

2, some elements (such as calcium, iron, zinc, etc. ) plays an important role in human health:

3. Comparison of several fibers:

Common inspection methods

Under the new curriculum, chemistry learning is a process of "from life to chemistry, from chemistry to society". This unit further embodies the connection between chemistry and society and life. Because of this, this knowledge unit has become the focus of the senior high school entrance examination, and it is also an indispensable content of the senior high school entrance examination proposition in various places. Through the analysis of the entrance examination questions in the area of curriculum reform in recent two years, we can know the nutritional functions of protein, sugar, oil, inorganic salts, vitamins and other nutrients and their relationship with human health, the composition of human elements and the effects of some elements on human body, the difference between organic and inorganic substances, the characteristics of organic and organic polymer compounds, the properties and uses of three synthetic materials, and the basic knowledge of preventing "white pollution" and maintaining the environment.

Misunderstanding reminder

Protein plays various functions in people's life activities. In order to maintain people's normal life activities, we must pay attention to prevent harmful substances (such as formaldehyde and carbon monoxide) from invading people's protein.

2. To solve the problem of "white pollution", we should start from the following aspects:

1. Reduce the use of unnecessary plastic products, such as replacing plastic bags with cloth bags.

2. Reuse some plastic products, such as plastic lunch boxes.

3. Use some new and degradable plastics, such as microbial degradable plastics and photodegradable plastics.

4. Recycle all kinds of waste plastics.

Typical example

Can play a role in regulating metabolism, preventing diseases and maintaining health, mainly because vegetables and fruits are rich in things needed by the human body:

A. Oil B. Vitamin C. protein D. Starch

Analysis:

Oil mainly exists in peanuts, soybeans, fat pork and so on. Vitamins mainly exist in fruits and vegetables; Protein is mainly related to eggs; Starch exists in the tubers of grains and plants. Therefore, this question should choose B.

Answer: b