little knowledge of chemistry in life 1. seek chemistry knowledge 100 little knowledge of life about chemistry
a. the most of chemistry 1. the most abundant metallic element in the earth's crust is aluminum. 2. The most abundant non-metallic element in the earth's crust is oxygen. 3. The most abundant substance in the air is nitrogen. 4. the hardest naturally occurring substance is diamond. 5. the simplest organic substance is methane. 6. the most abundant metal in the order of activity table is aluminum. 6. the most active metal in the order of activity table of metals is potassium.7. the oxide with the smallest relative molecular mass is water.8. the gas with the lowest density under the same conditions is hydrogen.9. the most conductive metal is silver. 10. the atom with the smallest relative atomic mass is hydrogen. 11. the metal with the lowest melting point is mercury. 12. The most abundant element in the human body is oxygen.13. The element that makes up the largest variety of compounds is carbon. 14、The most widely used metal in daily life is iron. Second, fill in the blanks 1, the three kinds of particles that make up matter are molecules, atoms, ions.2, the reduction of copper oxide commonly used in the three reductants hydrogen, carbon monoxide, carbon.3, hydrogen as a fuel has three major advantages: abundant resources, high heat generation, the product of combustion is water does not pollute the environment.4, the composition of atoms in general, there are three kinds of particles: protons, neutrons, electrons.5, ferrous metals are only three kinds of: iron, manganese, chromium.6, The elements that make up matter can be divided into three categories namely (1) metallic elements, (2) non-metallic elements, and (3) rare gas elements.7, there are three kinds of iron oxides with the chemical formulas (1) FeO, (2) Fe2O3, and (3) Fe3O4.8, there are three characteristics of solutions (1) homogeneity; (2) stability; and (3) mixtures.9, there are three meanings of chemical equations: (1) to show What substances to participate in the reaction, the result of what substances; (2) that the reactants, products of each substance asked the molecules or atoms of the number of particles than; (3) that the reactants, products of the mass ratio between. Chemical equations have two principles: based on objective facts; follow the law of conservation of mass.10, pig iron is generally divided into three kinds: white iron, gray iron, ductile iron.11, carbon steel can be divided into three kinds: high-carbon steel, medium-carbon steel, low carbon steel.12, commonly used in the refining of iron iron ore there are three kinds of: (1) hematite (the main ingredient is Fe2O3); (2) magnetite (Fe3O4); (3) Rhodochrosite (FeCO3).13, the main equipment for steelmaking there are three: converter, electric furnace, flat furnace.14, often associated with the temperature of the three reaction conditions are ignition, heating, high temperature.15, saturated solution into an unsaturated solution there are two ways to: (1) warming, (2) add solvent; unsaturated solution into a saturated solution there are three ways to: lowering of the temperature, the addition of solute, evaporation of the solvent at a constant temperature. (Note: solubility with the temperature and become smaller substances such as: calcium hydroxide solution from a saturated solution into an unsaturated solution: lowering the temperature, add solvent; unsaturated solution into a saturated solution there are three ways: warming, add solute, constant temperature evaporation of the solvent).16, the collection of gases in general, there are three methods: drainage method, upward evacuation method, the downward method of evacuation.17, the three main causes of water pollution: (1) industrial production of waste residues , waste gas, waste water; (2) the arbitrary discharge of domestic sewage; (3) agricultural production of pesticides and fertilizers applied with the rain into the river.18, usually use three kinds of fire extinguishers: foam fire extinguishers; dry powder fire extinguishers; liquid carbon dioxide fire extinguishers.19, the solubility of solids with the change in temperature can be divided into three categories: (1) the majority of solids solubility with the increase in temperature and increase; ( (2) a few substances solubility by the temperature is very small; (3) very few substances solubility with the increase in temperature and decrease.20, CO2 can extinguish the fire for three reasons: can not burn, can not support combustion, the density is greater than the air.21, the monomers can be divided into three categories: metallic monomers; non-metallic monomers; rare gases monomers.22, the world's most important three major fossil fuels today are: coal, oil, natural gas.23, should remember that the three black oxides are: copper oxide, manganese dioxide, three iron tetraoxide.24, hydrogen and carbon monomers have three similar chemical properties: stability at room temperature, flammability, reducibility.25, the textbook appeared three times light blue: (1) liquid oxygen is light blue (2) sulfur combustion in air has a weak light blue flame, (3) hydrogen combustion in air has a 26, with the element copper related to the three blue: (1) copper sulfate crystals; (2) copper hydroxide precipitate; (3) copper sulfate solution.27, filtration operations in the "three against": (1) the lower end of the funnel against the inner wall of the beaker; (2) the end of the glass rod lightly against the three layers of the filter paper; (3) to be held to be over the filtrate of the beaker 28, Qipu generator consists of three parts: a spherical funnel, container, gas conduit. 29, the flame of the alcohol lamp is divided into three parts: the outer flame, the inner flame, the flame center, of which the outer flame has the highest temperature. 30, access to medicines, there is a "three don't" principle: (1) do not use your hands to touch the medicine; (2) do not put your nose to the mouth of the container to smell the gas; (3) the beaker to be filtration liquid to be held against the glass cupped diversion. (2) do not put his nose to the mouth of the container smell the smell of gas; (3) do not taste the taste of drugs.31, write the following substances color, state bilious alum (blue alum, copper sulfate pentahydrate CuSO4?5H2O): blue solid basic copper carbonate (cupric green): green solid black solid: carbon powder, copper oxide, manganese dioxide, tetrakis(iron) oxide white solid: anhydrous copper sulfate (CuSO4), potassium chlorate, potassium chloride, magnesium oxide, Sodium chloride, calcium carbonate, sodium carbonate, zinc sulfate purple-black: potassium permanganate light green solution: ferrous sulfate (FeSO4) 32, to make combustible combustion conditions: combustibles in contact with oxygen, to make combustibles to reach the ignition point of the temperature of the 33, by the double atoms constitute the molecules of gases: H2, O2, N2, Cl2, F234, the following by the atomic structure of which part of the decision: ①, the elemental species is determined by the number of protons, ②, the classification of elements is determined by the number of outermost electrons, ③, the chemical properties of elements is determined by the number of outermost electrons, ④, the valence of the element is determined by the number of outermost electrons, ⑤, the relative atomic weight is determined by the number of protons + the number of neutrons.35, learned organic compounds: CH4 (methane), C2H5OH (alcohol, ethanol), CH3OH (methanol), CH3COOH (acetic acid, acetic acid) 36, from the macro and microscopic understanding of the law of conservation of mass can be summarized as five unchanged, two must change, a possible change: (1) five do not change: recognize the macroscopic look at the types of elements and the total mass of the reactants and products remain unchanged, from the microscopic look at the atomic mass, the types of atoms and the number of atoms remain unchanged; (2) two must change: recognize the macroscopic look at the types of substances will definitely change, from the microscopic view of the molecular species must change; (3) a possible change: the sum of the molecules may change.37, the two monomers of carbon: graphite, diamond (the reason for the formation of: the arrangement of carbon atoms is different).38, write the following things.
2. Chemistry in life
1. The use of iodized table salt.
Iodine is an essential nutrient, long-term iodine deficiency can lead to iodine deficiency, consumption of iodized salt is the most simple, economical and effective way to eliminate iodine deficiency. Iodized salt contains sodium chloride and potassium iodate, the human body needs iodine is potassium iodate to provide, and potassium iodate by heat, light, unstable and easy to decompose, thus affecting the human body on the intake of iodine, so frying should pay attention to: add salt should be waiting for the pan, and do not stew for a long time.
2, tofu can not be cooked with spinach. Calcium oxalate is a precipitate that cannot be absorbed in the body .
Spinach, onions, bamboo shoots are rich in oxalic acid, sodium oxalate, tofu contains more calcium salts, such as calcium sulfate and other components. The above substances can undergo a complex decomposition reaction to produce substances such as calcium oxalate precipitate.
From the medical point of view: spinach, onions, bamboo shoots, etc. Do not eat mixed with tofu at the same time, will generate calcium oxalate precipitation, is the cause of stone; from the point of view of nutrition, mixed consumption will destroy their nutrients. 3, aluminum on the human health hazards.
Aluminum has been considered a non-toxic element, and thus aluminum drinking utensils, aluminum-containing fluffy agent baking powder, water purification agents are used in large quantities. However, research in recent years has shown that aluminum can disturb the metabolism of the human body, long-term slow harm to human health, the toxicity caused by the slow and imperceptible, however, once the metabolic disorders of the toxic reaction is serious consequences.
Prevention of aluminum poisoning, life should pay attention to (1) to reduce the entrance way of aluminum, such as eating less doughnuts, treatment of gastric drugs as far as possible to avoid aluminum hydroxide agents. (2), less food aluminum products packaged food.
(3), the use of aluminum products in moderation, to avoid prolonged contact between food or drinking water and aluminum products. 4, why can fruit alcohol, this is because the fruit contains organic acids, for example, apples contain malic acid, citrus contains citric acid, grapes contain tartaric acid, etc., and the main component of the wine is ethanol, the interaction of organic acids with ethanol and the formation of ester substances to The main reason for this is the fact that it is not a good idea to have a good time.
By the same token, vinegar can relieve alcohol because vinegar contains 3-5% acetic acid, which can generate ethyl acetate by esterification reaction with ethanol.5. When frying, you should not burn the oil to smoke, the oil is easy to generate a polycyclic compounds at high temperature, and the unsaturated fatty acids contained in vegetable oil are more prone to the formation of polycyclic compounds, which are easy to induce animal bladder cancer, as proved by the experiment. The first thing you need to do is to get rid of it.
Generally, the oil will be burned to boiling on the line, the oil "angry" can be removed. 6, why there is "red tide" in the sea water.
In recent years, China's Bohai Bay and other offshore waters, there has been a large area of red tide, people call this phenomenon "red tide". Red tide is not a tidal phenomenon, not like the "black tide" as the movement of the sea current, but a red plankton in the ocean under certain conditions overpopulation of biological phenomena.
Why can plankton overpopulation? It turns out that a large number of influx into the ocean in the wastewater, waste water, as well as the exchange of atmospheric substances into the ocean, some of which contain nitrogen, phosphorus and other elements, belonging to the growth of plant nutrients necessary. Therefore, a large number of plankton rapid breeding, the sea put on a "red dress".
In order to prevent the phenomenon of red tide in the ocean, we should control the nitrogen-containing and phosphorus-containing wastes, such as phosphorus-containing laundry detergent wastewater and other discharges into the ocean, in order to maintain the ecological balance of the ocean. 7, the acidity and alkalinity of the food.
Research has found that eating more alkaline food can keep the blood alkaline, so that the blood lactic acid, urea and other acidic substances to reduce, and can prevent its deposition in the blood vessel wall, and thus have the effect of softening the blood vessels, so some people say that alkaline food for the blood and blood vessel cleanser. Generally speaking, rice, flour, meat, fish, eggs and other foods are almost all acidic food, while vegetables, fruits, milk, yams, potatoes, soy products and aquatic products are alkaline food.
Attention to scientific diet, improve food structure, strengthen physical exercise, and develop good habits, vascular sclerosis can be expected to be delayed and reversed. The acidity of human body fluids is closely related to the level of IQ.
In the body fluid pH allows the range, acidic high IQ is lower, alkaline high IQ is higher. Scientists tested dozens of boys between the ages of 6 and 13, and the results showed that children with a body fluid pH greater than 7.0 in the cerebral cortex had an IQ as much as twice as high as those with a pH less than 7.0.
Certain children with poor academic performance and low levels of intellectual development are often more acidic. 8, sulfur dioxide in food.
Sulfur dioxide is a very important member of the inorganic chemical preservatives. Sulfur dioxide has been used as a food additive for centuries, and the earliest record is that it was used in Roman times to sterilize wine vessels.
Later, it was widely used in food, such as the manufacture of dried fruit, dried fruit fumigation; made of sulfur dioxide release agent, used for grapes and other fruits preservation storage. Sulfur dioxide in food can show a variety of technical effects, generally referred to as bleaching agent, because sulfur dioxide can act with colored substances on food bleaching.
On the other hand sulfur dioxide has a reducing effect and can inhibit the activity of oxidizing enzymes, thus inhibiting enzymatic browning. In short, because the application of sulfur dioxide can make dried fruits, preserved fruits, etc. have a beautiful appearance, so some people call it a cosmetic additive.
Sulfur dioxide in the role of "cosmetic" at the same time, but also has a lot of non-cosmetic effects, such as preservation, antioxidant, etc., which is necessary to maintain the nutritional value and quality of food. For a long time, people have believed that sulfur dioxide is harmless to the human body, but since Baker et al. in 1981 found that sulfites can induce a part of the asthma patients asthma relapse, people re-examine the safety of sulfur dioxide.
After a long period of toxicological studies, it is believed that sulfite preparations are not significantly harmful to most people at the current doses used. There are two other points that should be made: sulfites in food must reach a certain dose to cause allergies, even very sensitive sulfite allergy, but not to all foods treated with sulfites are allergic to sulfur dioxide, from this point of view, sulfur dioxide is a safer preservative.
9, why is salt moist? How to make it not damp? In the salt often contains magnesium chloride. Magnesium chloride in the air in the phenomenon of deliquescence.
In order to prevent salt deliquescence can generally be placed in the pot salt dry frying. As magnesium chloride is hydrolyzed at high temperatures to generate magnesium oxide (MgO), losing deliquescence.
Or purify table salt, pure sodium chloride in the air without.
3. Little life knowledge about chemistry ~ help me answer 20 little life knowledge about chemistry
Don't put spinach and tofu together to cook Spinach's vitamin content is among the top of the list of various vegetables. A catty of spinach, containing about carotene (raw material for the manufacture of vitamin A) 133 grams; containing vitamin C 138 grams, more than double the content of the familiar tomatoes.
Therefore, eating spinach is very good for health, anemia, high blood pressure, cartilage disease and dental bleeding and other conditions also have a very good therapeutic effect. Spinach contains a lot of oxalic acid, and should not be put together with tofu to cook.
Because the magnesium chloride in the tofu (brine MgCI2) or gypsum (CaSO4) and oxalic acid meet a chemical reaction occurred, generating an insoluble magnesium oxalate or calcium oxalate, deposited in the walls of blood vessels, affecting the blood circulation, which is particularly affected by the normal development of children. The oxalic acid in spinach also affects the absorption of calcium in children.
But this shortcoming of spinach can be remedied, as long as the first hot water will spinach hollowed out once again, and then into the cool water soaked for about 20 minutes, so that the vast majority of oxalic acid is leached out. 2.
Can I drink the boiler water? The water used to steam buns or small vegetables in the home is called steamer water. This kind of steamer water can not drink or cook rice or boil porridge, what is the reason for this? We know that the water contains traces of nitrate, when the water is heated for a long time, due to the continuous evaporation of water, the concentration of nitrate is relatively increased, and it is thermally decomposed into nitrite.
Nitrite is extremely harmful to people's health. It can make the human blood hemoglobin denaturation, can no longer be combined with oxygen, early into hypoxia.
Nitrites can also cause a drop in blood pressure, which in severe cases can lead to dehydration. Modern medicine has proved that nitrite is also a strong carcinogenic substance.
So, the steamer water can not drink. 3.
People in the purchase of lamb, often based on the color of the meat to determine the degree of freshness of the meat, why? Due to the slaughter of pigs and sheep bleed incomplete and residual hemoglobin, hemoglobin iron in the form of divalent ions exist, so fresh meat is bright red. With the meat of the aging, divalent iron ions are gradually oxidized by the air for trivalent iron ions, so that the meat is dark red.
4. 10 kinds of food should not be eaten more Pine eggs: the production of pine eggs need to use a certain amount of lead, therefore, more food can cause lead poisoning, but also cause calcium deficiency.
Stinky tofu: stinky tofu in the fermentation process is very easy to be contaminated by microorganisms, while containing a large number of volatile salts of nitrogen and hydrogen sulfide, etc., which are protein decomposition of the corruption of the material, more food is harmful to the human body. MSG: per person per day MSG intake should not be more than 6 mg, excessive intake of glutamate in the blood will be elevated, restricting the use of essential 2-valent cation calcium and magnesium, which can cause a short period of headache, nausea and other symptoms of the human reproductive system will also have an adverse effect.
Instant noodles: Instant noodles contain food coloring and preservatives that are not good for the human body, often eaten on the body is not good. Sunflower seeds: sunflower seeds contain unsaturated fatty acids, eat more will consume a lot of alkali in the body, affecting the function of liver cells.
Spinach: spinach is rich in nutrients, but it contains oxalic acid, zinc and calcium in the food will be combined with oxalic acid and discharged from the body, thus causing a lack of human zinc and calcium. Pig liver: 1000 grams of pig liver contains cholesterol up to 400 mg or more, and a person's cholesterol intake is too much will lead to atherosclerosis and aggravate cardiovascular disease.
Roast beef and lamb: Beef and lamb in the smoking process will produce such harmful substances as benzopyrene, which is a cancer-inducing substances. Pickles: Pickles such as pickling is not good, will contain carcinogenic amine nitrite.
Doughnuts: Doughnuts in the alum is an inorganic substance containing aluminum, eating doughnuts every day, aluminum is difficult to discharge by the kidneys, which is toxic to the brain and nerve cells, and even triggered Alzheimer's disease. Eating detoxification food is good for health pig blood: China's traditional medicine, pig blood is beneficial to intestinal laxity, remove the function of intestinal dirt.
Modern medicine has confirmed that the plasma proteins in pig's blood are broken down by gastric acid in the body, which can produce a detoxification, intestinal decomposition, this material can invade the body of dust, harmful metal particles biochemical reaction, and then from the digestive tract out of the body. Kelp: Chinese medicine believes that the kelp is cold, salty, function of the soft knot, clearing heat and water, go to fat and lower pressure.
Kelp also has the role of preventing leukemia (blood cancer). Carrot: Carrot is also an effective detoxifier.
Not only rich in carotene, after eating can increase the human body vitamin A, but also contains a large amount of pectin, this substance and mercury combination, can effectively reduce the concentration of mercury in the blood, accelerate the elimination of mercury ions in the body, so there is a role in the expulsion of mercury. 5.
Food color, aroma and taste The color of food, mostly artificial coloring, made with food coloring. There are also some food color is due to itself contains some kind of natural pigment.
Such as green vegetables, stems and leaves and immature fruits presented by the green chlorophyll, tomato red tomato pigment, shrimp and crab shells contain mayfly erythrocyanin, can be presented after heat red. The aroma of food comes from alcohols, aldehydes, ketones, esters and other volatile substances.
Fish, meat, eggs are rich in protein, protein itself does not have a fresh taste, but after cooking, hydrolyzed into a variety of amino acids, amino acids have a fresh taste. Among the amino acids, glutamic acid is the most flavorful.
"MSG" is the sodium salt of glutamic acid. Sucrose diluted with water to 200 times, you can not feel the sweetness, while MSG diluted with water to 3000 times, you can still taste the fresh flavor! Recently developed a mixture of monosodium glutamate and sodium inosinate made of powerful monosodium glutamate, its fresh flavor is 40 times that of monosodium glutamate.
Shrimp, crab, snails, clams contain a lot of succinic acid in the body, so there is a unique flavor that people love. The aroma of cinnamon is due to the presence of cinnamon aldehyde, and the aroma of curdled wine comes from the heterohydric alcohols and esters produced during the fermentation process.
The aroma of bananas is volatile isoamyl acetate, citrus aroma from the contained nerol. As for the aroma of pastries and candies, it is due to the addition of artificial fruit flavors.
In China, people are accustomed to the flavor is divided into sour, sweet, bitter, spicy, salty "five flavors". Sour flavor is a variety of organic acids ionized hydrogen ions, the strength of the acidic flavor is determined by the size of the hydrogen ion concentration.
Vinegar contains about 3%-5% acetic acid, sauerkraut contains lactic acid, fruits, beverages or candies in the sour taste, from the composition of its citric acid, tartaric acid, malic acid and vitamin C and other ingredients. Sweetness is caused by sucrose, fructose, glucose, maltose, lactose and other sugar substances.
The production of pastries, cookies, popsicles, ice cream, but also often add an appropriate amount of saccharin.
4. Some of the chemical knowledge in life
I. Four major classes of biomolecules: 1, sugar, a common name called "carbohydrates" thing.
2, protein, a model built by amino acids macromolecules. Unfortunately, human proteins can only be built from 20 lovely amino acids, 8 of which have to be taken in from outside.
3, lipids, an energy-based biomolecule that makes modern women vomit. 4, nucleic acids, a substance said to be important in influencing heredity.
Biologists all over the world have rushed around DNA and RNA. The constituent elements of all these substances are simple C,H,O,N,P,S. Their Chinese writing should not be forgotten.
Second, inorganic materials have a lot to do with our lives.1 Obviously, the main ingredient of the stainless steel pots and pans in our house is iron.
The reason for its rust-free and abrasion-resistant properties is that the steelmakers add the pesky metal chromium (Cr) to it.2 As for nanomaterials, they have a much larger surface area in comparison and have superb optical, electrical, magnetic, and thermal properties.
Also, don't forget Oh, 1 nanometer = 1 * 10-9 meters. 3, of course, the highest melting point of the metal is my home light bulb is tungsten; the lowest is the thermometer in the mercury; hardness of the largest metal is stainless steel pots and pans in the chromium; gold has always been the best to the best malleability and complacency; silver is also due to the conductivity of the good by the scientists of the favor; lithium is the lightest metal, as opposed to more than Osmium (Os).
4, quartz optical fiber is a good thing, generally used in communications and medical, specifically, is the use of SiO2's high refractive index to transport information and through the internal organs ("gastroscope"). 5, then, shape memory alloys is what it is? It turns out that after it suffers deformation, heated to a certain temperature, surprisingly, will restore the original shape.
This wonderful world ah! 6, of course, we put the sodium glass, potassium glass, quartz glass, glass fiber reinforced plastic and toughened glass row seat, you will find that the pressure-resistant and pull-resistant is glass fiber reinforced plastic, high temperature and sudden cold and sudden heat quartz glass. Other glass is too delicate, not a good boy.
Third, environmental pollution 1, shocked the world of public events: Maas Valley smog event (Belgium); Los Angeles photochemical smog; Donora smog event (Pennsylvania, United States); London smog event; Minamata (yu) disease event (Japan); bone pain disease event (Japan); Yokkaichi City asthma event (again, poor Japan); rice bran event (Japan); Pabol event (India); Chernobyl nuclear leakage (USSR); Rhine pollution (Switzerland); marine and air pollution in the Gulf War. 2, as for what is said to be "atmospheric inversion phenomenon" and atmospheric stratification, due to space constraints, please do not record.
3, the main components of automobile exhaust: CO, NOx, SO2, HC (hydrocarbons) and solid particulate matter (lead compounds, carbon particles, oil mist, etc.). It is these things that bring the audible and invisible suffering to our city.
4, the atmosphere of dust particles: ⅰ, precipitation dust: diameter greater than 10 microns, can rely on gravity to fall, the harm to the human body is barely tolerated; ⅱ, floating dust: diameter less than 10 microns, in the air for a long time to drift, resulting in many elderly people and small children suffering from lung disease and death, and it is a chronic - an Invisible ghost killers! 5, the definition of photochemical smog: nitrogen oxides, hydrocarbons and other primary pollutants in the sun's ultraviolet light under the action of a series of photochemical reactions, generating ozone (accounted for more than 85% of the product), peroxyacetyl nitrate, highly reactive free radicals, aldehydes, ketones, and organic acids, and other secondary pollutants, the formation of these primary pollutants and secondary pollutants of the mixture known as photochemical smog IV, Chemical elements and human health, who do not believe that who is moving against the tide of history. 1, common trace elements: vanadium V, chromium Cr, manganese Mn, iron Fe, cobalt Co, nickel Ni, copper Cu, zinc Zn, molybdenum Mo, iodine Z, selenium Se, tin Sn, silicon Si, bromine Br, fluorine F, boron B.
(macronutrients are iron indeterminate carbon, hydroxide and nitrogen) 2, harmful elements: lead Pb, Mercury Hg, chromium Cr6+, beryllium Be, cadmium Cd, arsenic As3+ five, modern life under the shadow of polymer materials 1, the so-called polymer compounds, the most prominent feature is its "high" molecular weight, generally more than 10,000 to deserve to be called polymer. Of course, it is an organic compound, that is, there is carbon.
2, then what is a polymer material? It refers to the polymer as the basic raw materials, add appropriate auxiliary agents, after a certain amount of careful processing and made of wonderful materials. 3, according to the use of points, polymer materials can be divided into plastics, rubber, fibers, coatings, adhesives, sealing materials, etc., each in the construction of the national economy exudes light and heat.
Six, the virus and health really have a very close relationship 1, common antiviral drugs: amantadine, methyl amantadine methylamine, adenosine, viral azole, acyclovir, ganciclovir, zidovudine, viruses. 2, the interference phenomenon of the virus: this is the philosophy of the ruthless poisoner, that is, two viruses infect the same cell, there is a virus to inhibit the other viruses value-added wonderful phenomenon.
The so-called "black in the black hand, outside the sky and outside the wind". 3, we must remember that the virus is cold-resistant, not heat-resistant, typical of the Siberian spirit.
Seven, ozone and ozone depletion ozone is shrinking in the stratosphere 15-35 kilometers in the territory. This is an indisputable fact.
VIII. Radiation Chemistry "Radiation" of ordinary people's lives 1, ionizing radiation: radiation with an energy greater than the ionization energy of atoms (molecules) (about 5 - 25 radiation eV), and they act on the material, often forcing atoms (molecules) to Ionization or excitation - even if they do not want to do so. 2, radiation chemistry: the study of ionizing radiation and material interaction with the chemical effects of the chemical sub-discipline.
There is information that NNU is doing very well in this field.3, absorbed dose and units: the energy absorbed per unit mass of the illuminated material is called the absorbed dose.
The SI unit is J.kg-1, beautifully called "Gorey" (Gy). 1Gy is equal to 1 kg of irradiated material to absorb 1J of energy.
That is, 1Gy = 1 J.kg-1 1Gy = 100racl This is a lot of people stipulated, do not need a reason. Nine, unsaturated fatty acids and human health 1, fatty acids, the main carbon hydroxide composition of the guy, is the most critical material basis of fat; even the most critical material basis of health is fatty acids.
2, ω-3 series: fish oil, α-linolenic acid; ω-6 series: γ-linolenic acid, linoleic acid, arachidonic acid; ω-9 series: oleic acid. In fact, these.
5. Chemistry is everywhere in life, Xiao Qiang learned chemistry knowledge for life, the following exploration
(small) because calcium carbonate can react with acid, Xiao Qiang should be from the kitchen ten to choose the eggs and acetic acid; (5) ① if to the cup ten to gradually add salt powder until the solution is saturated, due to the density of saturated saline water is greater than that of the eggs, the eggs by the buoyant force is gradually greater than the force of gravity, the eggs will float; ① if to the cup ten to gradually add salt powder until the solution is saturated, as the density of saturated salt water is greater than that of eggs, eggs by buoyancy is gradually greater than the force of gravity. eggs will float; ② because the main component of the eggshell is calcium carbonate, to the beaker ten to add concentrated hydrochloric acid, the reaction of a of O1 + 5H l ═ a of l5 + H5O + O5 ↑, so the surface of the eggshell will have bubbles generated to generate carbon dioxide gas attached to the surface of the egg five in the egg so that the egg first floated to the top of the solution after the reduction of bubbles, gravity is greater than the buoyancy, and then sinking, so that constantly up and down, and finally floated. Finally floating; (1) ① as the main component of the eggshell calcium carbonate can react with hydrochloric acid generated carbon dioxide gas, carbon dioxide does not support combustion, can not be burned, and under the same conditions than the density of air, will make the candle extinguished; and according to the nature of the determination of one of the main purpose is to extinguish the fire; ② when the candle is extinguished, in the mouth of the glass quickly covered - a piece of glass dipped in limewater, the observed phenomenon is limewater become turbid; due to the inability to prove that the elemental carbon is produced by burning candles or a of O1 and hydrochloric acid reaction, it can not be determined; (4) due to the reaction of carbon dioxide and calcium hydroxide calcium carbonate can be generated by the egg stomata blocked, can prevent the entry of bacteria, to play a preservation of the role of freshness. The equation of the reaction is: the O5 + a (OH) 5 = a of O1 ↓ + H5O. Therefore, the answer is: (small) acetic acid; (5) ① the egg will float, due to the saturated brine density is greater than the density of the egg, the egg by the buoyant force is gradually greater than the force of gravity; ② the surface of the egg shell will be generated by bubbles. Constantly floating up and down, and finally floating. The a of O1 + 5H of l ═ the a of l5 + H5O + the O5 ↑, (1) ① the candle is extinguished, carbon dioxide does not support combustion, can not be burned, and under the same conditions of the density is greater than the air, extinguish the fire; ② lime water becomes turbid, can not be, can not prove that the elemental carbon is produced by the candle combustion or the a of O1 reacted with hydrochloric acid to produce; (4) of the O5 + the a (OH) 5 = the a of O1 ↓ + H5O.