Air is a mixture (混合物),not a compound of gases. 相关知识点: 试题来源: 解析 答案: mixture.考查首字母填空,根据句意:空气是混合物,不是气体混合物.mixture是名词"混合物"是可数名词,因为不定冠词a, 所以此处天mixture. 空气是混合物,不是气体混合物....
题目In chemistry, a mixture is different from a ___. A. compound B. element C. atom D. molecule 相关知识点: 试题来源: 解析 A。在化学中,混合物不同于化合物,“compound”是化合物,“element”是元素,“atom”是原子,“molecule”是分子。反馈 收藏 ...
Mixtures Definition - A mixture contains two or more elements or compounds that are not chemically combined together. To learn about Homogeneous and Heterogeneous mixtures click here.
aOrcein is a compound mixture consisting of ∼14 related small molecules23 that has been used as a food coloring since the Middle Ages. 苔红素是使用了作为食用色素从中世纪的一个复合混合物包括的∼14相关的小molecules23。 [translate]
aOrcein is a compound mixture consisting of ∼14 related small molecules that has been used as a food coloring since the Middle Ages. 苔红素是使用了作为食用色素从中世纪包括∼14相关的小分子的一个复合混合物。[translate]
Is air a mixture or a compound?Question:Is air a mixture or a compound?Homogeneous and Heterogeneous Mixtures:Mixtures are impure substances and have a variable composition of different substances that are not chemically bound but are mechanically mixed. They...
The main classifications of matter include the categories element and compound, either of which may also be called a substance (which is a less specific term), and mixture, of which there are also many sub-categories.Definition of a (Chemical) Mixture:...
相关知识点: 试题来源: 解析 B。本题考查基础化学词汇。选项 A“mixture”指混合物;选项 C“element”指元素;选项 D“compound”指化合物。而“reaction”有反应的意思,在化学实验中物质颜色的变化被称为反应,所以选 B。反馈 收藏
百度试题 结果1 题目3. Air is a mixture (mix), not a compound of gases. 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
(a) by fractional crystallisation. (b) Distillation under reduced pressure, i.e., vacuum distillation. (c) to decompose NaCN or Na2S present in the Lassaigne's extract, otherwise these will produce white precipitate with AgNO3 and thus interfere wit