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Combing junior high school chemistry knowledge points The name, use and usage of commonly used instruments in chemical experiments,Access to medicines,Heating, dissolution, filtration and evaporation of substances,The washing of glass instruments and the preparation of solutions with a certain mass fraction are all hot spots in the senior high school entrance examination.1. examine the map.Write the instrument name according to the question.2. check the use.Briefly describe the use and precautions of an instrument or basic operation.3. examine and judge.To judge whether the basic operation of an experiment is correct or the purpose of the experiment,Judge the order of an operatio
How much is the removal rate of water purifier? The water purifier is also called water purifier and filter, which is a small water treatment equipment for deep purification of water quality according to the requirements of water use. Generally speaking, the water purifier refers to a small filter used as a household.The water purifier can be divided into many kinds according to different purification principles and processes. Among them, RO reverse osmosis technology has the highest filtration accuracy (filtration accuracy is 0.0001 microns), since the pore diameter of the reverse osmosis membrane is only one in 100,000 of the diameter of the hair wire, only water molecules and dissolved oxygen are allowed to pass through, all the impurities contained in the water, such as pesticides, bacteria, viruses, heavy metals and other harmful substances, have been trapped and eliminated. In addition to reverse osmosis technology, there are many other filtration technologies: Na filter (filtration accuracy is betw
Hollow fiber filter a is a kind of water treatment equipment? This thing is useless. filter some micro impurities ??? Hollow fiber filter-Hollow fiber filtration (English: Hollow fiber filter) as the name implies ultra-precision filtration.To sum up, it is a separation technique based on the size of molecules or ions.When the larger solute is trapped, the material smaller than the pore diameter of the membrane is filtered out with the volume.The method is simple in operation, without phase change and low in energy consumption, without adding chemical reagents.The molecular weight of the separation substance by UF is 5 k--0.1 million or approximate aperture size 10--100A (0.001--0.01um ).Can remove bacteria,Viruses and particles,Remove most of the gel,Polymer compounds,Heat sources and microorganisms,However, salt with low molecular weight cannot be removed.The reverse osmosis can intercept salts according to the phase difference, while the pore size range of micro-pore filtration is 0.1-1.0um.Consumables
