How to select the water purification equipment for pre-filtration, ultra-filtration and RO? It is recommended to use a soft machine to reduce the scale, and the softening resin in the soft machine is used to reduce the hardness of the water. At the same time, it depends on the needs of users. if you simply rely on a soft water machine, you can't reach the direct drinking standard.
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