The core of green chemistry is to apply chemical principles to remediate environmental pollution

Green chemistry, also known as "environmentally sound chemistry", "environmentally friendly chemistry", and "clean chemistry", green chemistry has only been produced and developed in the past ten years, and it is a "new chemical baby". It covers a wide range of disciplines such as organic synthesis, catalysis, biochemistry, analytical chemistry, etc. The biggest feature of green chemistry is that it adopts scientific means to prevent pollution at the beginning, so the process and the end are zero emission or zero pollution.

Many countries in the world have taken "greening of chemistry" as one of the main directions of chemical progress in the new century.

One of the core elements of green chemistry is "atom economy", that is, the full use of the individual atoms in the reactants, so as to make the best use of resources and prevent pollution. The concept of atomic economy was put forward in 1991 by the famous American organic chemist Trost (for which he won the academic award of the first green chemistry challenge award in 1998), the atomic economy of the reaction is measured by the atomic utilization rate, and each atom of the raw material molecule should be maximized for efficient organic synthesis, so that it can be combined into the target molecule to achieve zero emission. Green organic synthesis should be atom-economical.

The higher the atom utilization, the less waste the reaction will produce and the less pollution it will cause to the environment.

The second core content of green chemistry is mainly reflected in the five "R": the first is reduction, that is, to reduce the emission of "three wastes"; The second is reuse - "reuse", such as catalysts and carriers in the chemical industry, which is the need to reduce costs and waste; The third is recycling - "**", which can effectively achieve the requirements of "saving resources, reducing pollution and reducing costs"; The fourth is regeneration - "regeneration", that is, an effective way to turn waste into treasure, save resources and energy, and reduce pollution; The fifth is rejection - "refusal", which refers to the refusal to use in the chemical process for some irreplaceable, regeneration, regenerative and reusable, toxic and polluting raw materials, which is the most fundamental way to eliminate pollution.

The definition of green chemistry is to use chemical technologies, principles and methods to eliminate toxic and harmful chemicals to human health, safety and ecological environment, so it is also called environmentally friendly chemistry or clean chemistry. In fact, green chemistry is not a completely new science.

Green chemistry not only has significant social, environmental and economic benefits, but also shows that the negative effects of chemistry can be avoided and shows human agency. Green chemistry embodies the interconnection and interaction between chemical science, technology and society, and is the product of the high development of chemical science and the role of society in the development of chemical science, which is the arrival of a new stage for chemistry itself. As a generation in the new century, we must not only have the ability to develop new and more environmentally friendly chemistry to prevent chemical pollution; Moreover, it is necessary for the younger generation to understand green chemistry, accept green chemistry, and make due contributions to green chemistry.

Chemical enterprises have achieved zero emission and zero pollution.

a. The use of chemical additives pollutes water resources; Therefore, it is in line with the title b, using natural gas instead of gasoline and diesel as engine fuel can reduce air pollution; Therefore, it does not fit the topic

c. Degradable and reusable masking products can reduce white pollution; Therefore, it does not conform to the theme d. Macro refers to the promotion of the use of phosphorus-free detergents to reduce water eutrophication, and the use of fluorine-free refrigerators can reduce the emission of freon and reduce the destruction of the ozone layer; Therefore, it does not fit the topic

Therefore, a

Green chemistry refers to the chemistry that is pollution-free, pollution-free, and converts reactants into products as much as possible, so it is correct;

The core of green chemistry is to use chemical principles to eliminate pollution from the source to reduce waste discharge to the environment, so it is correct;

Green chemistry is environmentally friendly chemistry, which requires all the atoms in the raw material to be completely utilized and all transferred to the desired product, so that the utilization rate of the atoms can reach 100% as much as possible, so it is correct;

Green chemistry is not strictly defined, it is a concept, green chemistry refers to pollution-free, pollution-free chemistry, and the production of environmentally friendly products that are conducive to environmental protection, community safety and human health is in line with the characteristics of green chemistry, so it is correct

Therefore, choose D

Green chemistry, also known as environmentally friendly chemistry, is the core of which is to use the principle of chemical reaction to eliminate pollution from the source, so the answer is: environmentally friendly chemistry; Eliminate pollution at the source

Answer: a, the organic solvents in the coating are mainly benzene, esters, aldehydes, ethers, etc., containing harmful substances that endanger people's health, the development of water solvent coatings instead of organic solvent coatings, reduce the harm of organic solvents, in line with the concept of green chemistry, so a is not selected;

B. Degradable and reusable products can reduce white pollution and conform to the concept of green chemistry, so B is not selected;

c. Copper sulfate is prepared with concentrated sulfuric acid and copper, and sulfur dioxide harmful gases are produced during the reaction process to pollute the atmosphere, which is not in line with the concept of green chemistry, so C is selected;

d. The atomic utilization rate of this reaction is 100%, no pollutants are produced, and it is in line with the concept of green chemistry, so D is not selected;

Therefore, C

a. Develop water-solvent coatings to replace organic solvent coatings.

b Use degradable plastics to produce packaging boxes or fast food boxes.

c Reaction: Preparation of copper sulfate.

d Reaction with: preparation of ethylene oxide.

Answer: c

Green chemistry is the use of chemical principles fromat the sourceReduction and eliminationIndustrial productionPollution of the environment,The SO2 produced by the reaction of copper and concentrated H2SO4 to CuSO4 in C will cause acid rain, which is not in line with the concept of green chemistry. The products of A and B have no pollution to the environment, and the utilization rate of atoms in D is 100%, and there are no by-products that pollute the environment.

The reaction used to prepare CuSO4 is not in line with green chemistry because it produces the polluting gas SO2

a. Waste is generated, and reprocessing waste is conducive to pollution prevention and control, but it is not to eliminate pollution from the source, so it is wrong

b. Controlling pollution points is not to eliminate pollution from the source, so it is wrong c. Reducing the discharge of toxic substances is essentially the treatment of pollution after pollution, nor is it to eliminate pollution from the source, so it is wrong

d. Eliminating the source of pollution is to eliminate pollution from the source, which is in line with the core of green chemistry, so it is correct to choose D

c, since it can reduce toxic substances, why do you still spend a lot of effort to treat, only in the case that it is really impossible to reduce, and then to treat, the title also wrote that source treatment is the core.

"Green chemistry" requires the fundamental elimination of pollution, and is a science that can completely prevent pollution, including "greening of raw materials", "greening of chemical reactions", "greening of products" and so on

a. There may be pollutants in the process of waste disposal, so a is wrong;

b. "Green chemistry" requires the fundamental elimination of pollution, so the treatment of pollution points is in line with green chemistry, so B is correct;

c. Eliminate pollution sources, there are many types of pollution sources, if it is impossible to completely eliminate them, because some industries are closely related to people's lives, so they can not be eliminated, but can only reduce pollution to a minimum, so C is wrong;

d. Deeply burying toxic substances will not completely prevent pollution and will pollute the soil