The boiling of water is a(n) ___. A. chemical reaction B. physical change C. electrical reaction D. biological change 相关知识点: 试题来源: 解析 B。解析:水沸腾是物理变化,只是状态改变,没有新物质生成。选项 A 化学反应会有新物质生成,不符合。选项 C 电反应与题目无关。选项 D 生物变化不符...
When you dissolve table salt (sodium chloride, also known as NaCl) in water, are you producing achemical changeor a physical change? Well, a chemical change involves achemical reaction, with new substances produced as a result of the change. A physical change, on the other hand, results in...
a change (2) The dissolving of salt in water is ___. [ ] A. a physical change B. a chemical change C. hydrogen and oxygen D. breaking up (3) The change of the three states of water is ___. [ ] A. a chemical change B. different substances...
However, there's a dispute about whether dissolving an ionic compound (like salt) is a chemical or physical change because a chemical reaction does occur, where the salt breaks into its component ions (sodium and chloride) in water. The ions display different properties from the original compoun...
Water pollutants come from eitherpoint sourcesordispersed sources.A point source is a pipe or channel, such as those used fordischargefrom an industrial facility or a citysewerage system. A dispersed (or nonpoint) source is a very broad unconfined area from which a variety of pollutants enter ...
Petroleum refining is to fractionate crude oil into different petroleum products according to its different boiling points through physical separation or chemical reaction process. At the same time, water injection, stripping, condensation, water washing and tank water shearing in the refining process are...
or disinfected before consumption. Boiling water is the simplest and most effective way to purify water but it does not remove anyparticulate matteror chemical contaminants and is not effective in removing algal toxins such asmicrocystin. Filters are another method of effectively removing most ...
Ioriya T,,Inoue S,Haga M,et al.Change of chemical and bio-logical water environment at a newly constructed reservoir. Water Science and Technology . 1998T. Ioriya, S. Inoue, M. Haga, and N. Yogo, "Change of chemical and biological water environment at a newly constructed reservoir," ...
The present research results from the reactive MD simulations can be used to explain the important physical features in the drug release process for confined water molecules within CNTs. One factor is that ultralow water-carbon friction causes the fast water transport into the nanotubes. Boiling of...
We also developed a new test facility, Fig.4a, which provides a maximum power input 10 kW to the boiler and supplies boiling water at maximum temperature 190 °C to the reactors. A RO equipment with 1000L storage tank is used to supply water. ...