化学重要知识点(国外英文资料).docVIP

化学重要知识点(国外英文资料) Element compound knowledge module The larger the atomic radius of the alkali elements, the higher the melting point, the more active the elemental Error, the melting point decreases as the atomic radius increases Both sulfur and white phosphorus are soluble in organic solvents like carbon disulfide and tetrachloride, and organic acids are less soluble in water Error, low organic acid is soluble in water Add sufficient amount of sulfuric acid in the saturated solution of sulphate to produce blue solid Correct, concentrated sulphuric acid absorbs water and the alum is precipitated out The only thing that can react with cold water is a reactive metal single or active non-metallic substance Error: 2Na2O2 + 2H2O to O2 + 4NaOH It liquefies the air, and then it heats up, making oxygen first, and then nitrogen Error, the boiling point of N2 is lower than O2, you get N2, and you leave the liquid oxygen The main problem of smelting iron into carbon steel is to remove iron from iron and purify iron The mistake is to reduce the percentage of C in the pig iron rather than purify it Although the potassium content of nature is soluble in water, the K % is not high in the soil, so it is necessary to satisfy the plant growth Error, natural potassium element content is not low, but in the form of complex silicate form is insoluble in water It is necessary to make the powder, make the bordeaux liquid, and improve the acidic soil Correctly, the process of making the bleaching powder for the ripe lime and Cl2 reaction, the liquid of bordeaux is a mixture of lime and copper sulfate Silica is an acid oxide, which does not dissolve in an acid solution Error, SiO2 can dissolve in hydrofluoric acid Iron filings are soluble in excess hydrochloric acid and add chlorine or bromine or iodine or nitric acid, all of which produce Fe3 + Wrong, the iodized water will get FeI2, because Fe3 + oxidation is not as good as the Cl2, Br2, but its better than I2, and it doesnt exist in the s