A. chemical reaction B. physical change C. biological process D. electrical phenomenon 相关知识点: 试题来源: 解析 B。盐溶解在水中是一种物理变化,没有新物质生成。选项 A 化学反应会有新物质生成;选项 C 生物过程与盐溶解无关;选项 D 电现象不符合盐溶解的情况。反馈...
Therefore, dissolving salt in water is a chemical change. The reactant (sodium chloride, or NaCl) is different from the products (sodium cation and chlorine anion). Thus, any ionic compound that is soluble in water would experience a chemical change. In contrast, dissolving a covalent compound...
The electrolysis process of the electrolytic brine type sodium hypochlorite generator is an electrochemical reaction process. Its only raw materials are salt and water. The sodium hypochlorite solution is made of pure quality. Although the chemical principle is simple, there are many technical indicators...
This pH change was modeled as resulting from a sequence of chemical reactions, and the resulting rate constants discussed. The infrared absorption of the hydrated layers showed contributions from SiOH groups, molecularly adsorbed water and hydrogen bonding. Reaction rates were higher in salt solutions ...
Consider a common type of single-displacement reaction, the displacement of hydrogen from water or from acids by metals. The very active metals react with water. For example, calcium reacts with water to form calcium hydroxide and hydrogen gas. Calcium metal has an oxidation number of 0, ...
and initiator,and reaction temperature on the absorption capability of water and salt solution were investigated.The results show that the water absorbency of the superabsorbent polymer prepared at the optimum condition in deionized water and in 0.9%NaCl solution is about235 and 132g/g,respectively,...
There some 26,000 years ago, well before humans had migrated to north America, mammoths and other megafauna died after falling into what was then a steep sided water-filled sinkhole. 5. The term boxwork is nongenetic, it describes an aggregate with plates or septa which intersect at various...
A process for preparing a salt-free aqueous hydroxylamine solution by distilling an aqueous solution of a hydroxylammonium salt and a base in a tray column having at least two mechanical trays, wherein random or structured packings are located above at least one tray of the tray column over th...
Therefore, the variation of the cation structure-breaking properties performed in this work provide additional insights regarding the correlation between electrochemical stability and the reduction in chemical activity of water. The wide ESWs in the investigated electrolytes should be compatible with a Li...
the formation of a salt-rich region, the red brick of which are physical and chemical corrosion, combined with the expansion of water ice, weathering, such as the role of rain, the course of time will form a red brick Fan zone as early as in the failure of other parts of the body....