At room temperature, an element is formed into a powder-like solid, which is easy to melt. the element burns in oxygen and emits a blue-purple flame. 5 This element is sulfur,Sulfur burns blue and purple in oxygen,At normal temperature, it is a summary of powder junior high school chemistry. 1. chemistry is an experiment-based natural science that studies the composition, structure, nature and change law of substances.What physics and chemistry have in common: natural science based on experiments.2. the fundamental difference between chemical change and physical change is whether there are any new substances.Some phenomena such as heat release, light emission, discoloration, gas release and precipitation occur in chemical changes.3. physical properties--State, odor, melting point, boiling point, hardness, density, extensibility, solubility, volatility, conductivity, adsorption, etc.4. chemical properties--Oxidation, reduction, metal activity, activity, stability, corrosiveness, toxicity, etc.5. after heating
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What is the filtration technology of fiber turntable filter? After the secondary treatment of urban sewage,It will also contain a considerable amount of polluting substances,Reservoir and other slow running water experience leads to the water body nutrients;Discharged into water bodies with high economic value,Such as fish water,To destroy it: this kind of treatment water is more unsuitable for reuse.If you want to eliminate the above effects,Degree treatment,Filtering is one of the most commonly used technologies in deep processing.At present, there are not many filtration processes used in urban sewage treatment in China,There are many problems such as high operation cost and difficult construction.On the basis of absorption, improvement and innovation,Read,After years of research, the processing technology of 'fiber turntable filter' has been put forward.This is very low, the water quality is good, and it is an advanced filtration technology.1.(1) the flux of the