In a chemistry class, we learn about H2O. What does “H2O” mean? A. Hydrogen Oxygen B. Hydrogen two Oxygen C. Hydrogen dioxide D. Water 相关知识点: 试题来源: 解析 D。H2O 是水的化学式,表示由两个氢原子和一个氧原子组成的水分子。选项 A、B 表述错误,选项 C 是二氧化氢,不是 H2O 的...
In chemistry, concentration refers to the amount of a substance in a defined space. Another definition is that concentration is the ratio ofsolutein a solution to eithersolventor totalsolution. Concentration is usually expressed in terms ofmassper unitvolume. However, the solute concentration may al...
Permeability is a measure of the ease of passage of liquids or gases or specific chemicals through the material. Permeability is determined by applying a head
What is the definition of effervescence in chemistry? Why are noble gases chemically inert? Is carbon-12 chemically active or inert? Define noble gases What does isoelectronic mean in chemistry? What is a reactive atom? What does stable isotope mean?
What is a phase in physical chemistry? Matter: The matter is anything that makes up the universe and has a given volume and mass. Matter can only exist in the three primary forms: solid, whose particles are tightly packed, liquid with spaces between the particles, and the gases that have...
adoes not mean I do not want youyou 不意味我不想要youyou [translate] aVision,I love you more than I love me. 视觉,我爱你更多比I爱我。 [translate] aMy hobby is My hobby is [translate] aLittle information 一点信息 [translate] a他们正在屋里说话吗 In their room is speaking [translate]...
What is the definition of reaction rate in chemistry? What are the products of this reaction? CaCrO (aq) + FeCl (aq) \rightarrow ? What are the spectator ions in the reaction between KCl (aq) and AgNO_3 (aq)? What does the arrow mean in a chemical equation?
Over the years chromatography has gained an enviable position in analytical laboratories. You have been introduced to simple concepts on how to read a chromatogram.
Quality assurance in analytical chemistry - what does it mean?Mundschenk, H.ACCREDITATION AND QUALITY ASSURANCE
The International Union of Pure and Applied Chemistry (IUPAC) definition of adsorption is: "Adsorption vs. Absorption Adsorption is a surface phenomenon in which particles or molecules bind to the top layer of material. Absorption, on the other hand, goes deeper, involving the entire volume of ...