A. the other substances B. other substances C. the other substance D. others substance 相关知识点: 试题来源: 解析 B substance作“物质”讲时是可数名词。句意:一种物质如果没有和其他的物质混合,它就是一种纯的物质。根据语境可知,这里的“物质”应该是泛指而不是特指。所以,A、C两个选项都不对。
A. the other substances B. other substances C. the other substance D. others substance 相关知识点: 试题来源: 解析 B substance作“物质”讲时是可数名词。句意:一种物质假如没有和其他的物质混合,它确实是一种纯的物质。依照语境可知,那个地点的“物质”应该是泛指而不是特指。因此,A、C两个选项都...
Mixtures are made from pure substances. Mixtures are formed when two or more pure substances (elements or compounds) combine together physically. They can be separated back into the pure substances used to form the mixture because there is no chemical bonding. When a pure substance is present in...
这 [translate] aIdentification of the product 产品的证明 [translate] aproduct Identification 产品识别 [translate] ain case of pure product or substance, it is the mere chemical denomination of the commercialized product. 在纯净的产品或物质的情况下,它是商业化的产品的仅仅化工衡量单位。 [translate] ...
What is the difference between a pure substance and a mixture:一种纯物质和混合物的区别是什么a,A,be,Pure,and,pure,what,the,纯物质,What 文档格式: .ppt 文档大小: 218.5K 文档页数: 11页 顶/踩数: 0/0 收藏人数: 0 评论次数: 0 文档热度: ...
5 A pure substance has a boiling point of 70 C. The substance is heated from 30 C until the temperature is 90 C.(a)On Fig. 5.1, sketch a graph to show how the temperature of the substance changes with time as it is heated from 30 C to 90 C.[2]9080-70temperature/C6050403020...
Is a diamond classified as a pure substance, a pure element, a homogeneous mixture, or a heterogeneous mixture? Mixture: A mixture is stated as a type of physical combination that comprises substances whose identities are retained. These substances can be ...
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In many cases the components of a mixture can be separated quite easily, e.g. using a magnet to separate iron filings from a mixture of iron filings (dark grey colour) and sulphur (yellow colour). Note: This is one of a series of simple pages introducing key concepts in introductory che...
这结合以加速的“湿outperformance与一部透明影片的组合,做它理想为介入高清晰标记的应用 [translate] a亚洲渔业水产与养殖论坛 Asian fishery aquatic product and cultivation forum [translate] aThe molecule is the smallest particle of a pure substance 分子是一种纯净的物质的最小的颗粒 [translate] ...