Into Learning The Breathtaking Chemistry The Most Of The World （5）
2023-04-06
14.the most absorbent substanceThe US Agricultural Research and Service announced on 18 August 1974 that a superabsorbent treated with iron could absorb up to 130 times its own weight in water. The substance consists of 50% starch extract, 25% alkene ammonia and 25% acrylic acid. The substance's ability to maintain an equilibrium temperature for long periods of time makes it ideal for repeated use of ice packs, as was demonstrated at a game in Detroit, Michigan, in the United States, where the substance continuously lowered the body temperature of a 14-year-old baseball player.15.the hottest flameBasic carbon nitride produces the hottest flame, with temperatures up to 4988°C at 1 atmosphere of pressure.16.the lowest temperatureAbsolute zero -- the zero opening on the absolute temperature scale -- corresponds to -273.15°C, at which point the molecular heat of all atoms stops. The lowest temperature ever reached is 280 pico, which was generated and announced in February 1993 using a nuclear demagnetization device in the Cryogenic Laboratory at the University of Helsinki,Finland.
Do You Know All 17 Of The Most Toxic Reagents In The Lab（15-17）
15. Triton X-100Triton X-100: Causes severe eye irritation and burns. Can be harmed by inhalation, ingestion, or skin absorption. Wear proper gloves and goggles.16. (NH4) 2S2O8Ammonium persulfate [(NH4) 2S2O8] :Dangerous to mucous membrane and upper respiratory tract tissues, eyes and skin. Inhalation can be fatal. Wear appropriate gloves, safety glasses and protective clothing when operating. Always operate in the fume hood and wash hands thoroughly after operation.17, TrizolTrizol: Contains phenol, a toxic substance, such as skin contact with Trizol. Please rinse immediately with plenty of detergent and water. If you still feel unwell, please consult your doctor. If only a small amount of exposure, and after treatment of symptoms, it is not likely to be a problem.In addition, ultraviolet or ultraviolet light can damage the retina of the eye. Do not use naked eyes and unprotected UV light sources. Ultraviolet light sources commonly used in laboratories include portable ultraviolet lamps and ultraviolet transmissives.It can only be seen through a filter or safety glass that absorbs harmful wavelengths. Uv rays are also mutagenic and carcinogenic. To minimize exposure, ensure that UV light sources are properly protected. Wear appropriate preventive gloves when operating under UV light.
A Week To Learn Knowledge Of 100 Q | Hazardous Chemical Materials Safety Management(5)
2023-03-28
Question:What is a single proof tank?Answer: A single walled tank with insulation or a tank consisting of an inner tank and an outer tank. The inner tank can adapt to the storage of cryogenic frozen liquid requirements, the outer tank is mainly support and protect the heat insulation layer, and can withstand the pressure of gas purge, but can not store the leakage of cryogenic frozen liquid from the inner tank.
Into Learning The Breathtaking Chemistry The Most Of The World （four）
11. The least dense matterThe lowest density of solid materials is silicon oxygen gel. The silicon bonds together to form tiny spheres, which combine with oxygen atoms and grow into long strings separated by air sacs. The lightest aerogel, with a density of just 0.005 grams per cubic meter, was produced at Lawrence Livermore National Laboratory in California, USA. The material will be used in space to collect debris from the tails of micrometeoroids and comets.12, the highest temperatureThe highest temperature humans can produce is 510 million degrees Celsius, about 30 times hotter than the center of the sun, which was created on May 27, 1994, using a plasma mix of deuterium and tritium at a Tokamak fusion reactor at the Plasma Physics Laboratory in Princeton, New Jersey.13. Highest superconducting temperatureIn April 1993, a mixture of mercury, barium, calcium, and copper oxide HgBa2Ca23Cu3O1+X and HgBa2CaCu2O6+X produced great superconductivity with an accompanying maximum transfer temperature of -140.7°C in a laboratory in Zurich, Switzerland. Any temperature higher than that has not been proven.
Do You Know All 17 Of The Most Toxic Reagents In The Lab（11-14）
11. GiemsaGiemsa: The dye can be fatal or cause blindness if ingested. It is toxic through inhalation and skin absorption. The possible danger is irreversible effects. Wear proper gloves and safety goggles. Operate in a chemical fume hood and do not inhale the powder.12. NaN3Sodium azide (NaN3) : Very toxic. It blocks the cytochrome electron transport system. Solutions containing sodium azide should be marked clearly. May cause damage to health by inhalation, ingestion or skin absorption. Wear proper gloves and safety goggles, and use extreme caution when operating.13. SDSSodium dodecyl sulfate (SDS) : Toxic, is an irritant and poses a risk of serious eye damage. May cause damage to health by inhalation, ingestion or skin absorption. Wear proper gloves and safety goggles. Do not inhale the powder.14. TCATrichloroacetic acid (TCA) : Highly corrosive. Wear proper gloves and safety goggles.
A Week To Learn Knowledge Of 100 Q | Hazardous Chemical Materials Safety Management(4)
2023-03-23
Question:What is boiling oil?Answer: Oil containing water and can produce heat wave action during combustion
8. The most bitter substanceThe bitterest substance is basically composed of positive ions, which are commercially developed and manufactured as saccharides of benzoates. The standard of taste detection can be as low as 1/500 million. A dilute solution of 1/100 million can leave a bitter taste for a long time.9. The sweetest substanceOne plant arils extract (an adjunct to some plants' seeds) is 6,150 times sweeter than sucrose. This plant is found in parts of West Africa.10. The densest elementsThe densest substance on Earth is the metal osmium, with a value of 22.8 grams per cubic centimeter. The density of a single component at the core of a black hole is calculated to be infinite.
Do You Know All 17 Of The Most Toxic Reagents In The Lab（7-10）
7. TEMEDHas strong neurotoxicity, in order to prevent aspiration, operation should be fast, storage should be sealed.8. PMSFBenzene methyl sulfonyl fluoride [(PMSF), C7H7FO2S or C6H5CH2SO2F] is a highly toxic cholinesterase inhibitor. It is very destructive to respiratory mucosa, eyes and skin. Can be fatal by inhalation, ingestion or skin absorption. Wear proper gloves and safety glasses and always use them in a chemical fume hood. In case of contact, immediately flush eyes or skin with plenty of water and discard contaminated work clothing.9. CHCl3Chloroform (CHCl3) : Irritating to skin, eyes, mucous membranes and respiratory tract. It is a carcinogen and can damage the liver and kidneys. It is also volatile. Avoid breathing in volatile gases. Wear proper gloves and safety glasses and always operate in a chemical fume hood.10. HCOHFormaldehyde (HCOH) : very toxic and volatile, is also a carcinogen. It is easily absorbed through the skin, causing irritation and damage to the eyes, mucous membranes and upper respiratory tract. Avoid inhaling vapors that evaporate. Wear proper gloves and safety glasses. Always operate in a chemical fume hood. Keep away from heat, sparks and open flames.
Into Learning The Breathtaking Chemistry The Most Of The World （three）
2023-03-14
5. The deadliest synthetic chemicalsOf the 75 known dioxins, the most deadly are 2, 3, 7, 8-tetrachlorodibenzo-p-dioxins, which are 15,000 times more toxic than cyanide.6. The most magnetic substanceThe maximum energy output of Ndfeb Nd2Fe14B is 280 kJ/m3 (the so-called energy output is the maximum energy that a magnet can provide at a particular operating point).7. The most powerful nerve gasIn 1952, the British Chemical Defense Laboratory at Portdown, Wiltshire, developed a highly potent gas. The substance is 300 times more toxic than phosgene gas used in World War I. The substance can be lethal at an airborne density of 10 mg/cubic meter, and the minimum dose of oral lethal is 0.3 mg.
A Week To Learn Knowledge Of 100 Q | Hazardous Chemical Materials Safety Management(3)
Question:What is "two priorities and one major"?Answer: Hazardous chemicals under key supervision, hazardous chemical processes under key supervision, and major hazard sources of hazardous chemicals.
