A. physical change B. chemical change C. reaction D. combination 相关知识点: 试题来源: 解析 A。盐溶解在水中只是状态发生了变化,没有新物质生成,是物理变化。B 化学变化是有新物质生成的变化;C 反应通常指化学变化;D 组合不是物质性质变化的类型。反馈 收藏 ...
chemical change C. both physical and chemical change D. neither physical nor chemical change 相关知识点: 试题来源: 解析 A。盐溶解在水中是物理变化,因为没有新物质生成,只是盐的状态发生了改变。化学变化会有新物质生成,这里没有。所以不是化学变化,也不是两者都是。反馈 收藏 ...
aSugar was dissolved in hot tea until it was saturated. When the tea was cooled,the solution was supersaturated with sugar and not at equilibrium.The chemixal potential of the sugar in the solution is solid sugar at the same temperature. 糖在热的茶被溶化了,直到它饱和了。 当冷却了茶,解答...
When sugar is dissolved in hot tea physical changes occur. What are two physical properties of sugar that change when dissolved in hot tea? What properties might change during a chemical reaction? What would happen to the heat of fusion of water if salt was added to the water? What happens...
When sodium sulphate is dissolved in water, why doesn't it release the ions {eq}Na^+, S_2^- \enspace and \enspace O_2^- {/eq}? Answer and Explanation: When sodium sulphate dissociates (disolves) it separates into a Na ion and a SO4 ion. The sulphat...
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 收藏 ...
When salt is dissolved in water, it is a(n) ___. A. Chemical change B. Physical change C. Both A and B D. None of the above 相关知识点: 试题来源: 解析 B。盐溶解在水中是物理变化,因为没有新物质生成,只是盐分子均匀分散在水中。反馈...
To determine the pH of a solution when a salt of a weak acid and a weak base is dissolved in water, we can analyze the situation step by step.1. Understanding the Components: - A salt formed from a weak acid and a weak base
Why does sugar increase the boiling point of water? Why does the level of water seem to not rise when salt is dissolved in water? What is the cause of evaporation? What causes water to evaporate in the water cycle? Why do ionic compounds dissolve in water?
When dissolved is not truly dissolved -- the importance of colloids in studies of metal sorption on organic matter. J. Colloid Interface Sci. 361 (1), 137-147.Schijf J. and Zoll A. M. (2011) When dissolved is not truly dissolved--The importance of colloids in studies of metal sorption...