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...
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。而D项的表达本身就是错误的。反馈 收藏 ...
1. You are given two unlabeled bottles, each of which contains a colorless liquid. One contains hexane and the other contains water. What physical properties could you use to identify the two liquids? Determine whether the statement is a pure substance or mixture...
a. water b. carbon dioxide c. carbon d. air Pure Substance: Pure substances are made of definite atomic or molecular units with unique chemical properties. A mixture, on the other hand, is made up of at least two chemically different structural units and usually, ...
更新2: wt if...the salt is filtered from beach sand...is the salt still pure substance?a pure substance pound Salt is a chemical pound formed by replacing all or part of the hydrogen ions of an acid with metal ions or electropositive radicals. salt is basically NaCl whi...
5 A pure solid substance is heated into a liquid from 30 C to 90 C. The substance has a melting point of 60 C. The heating curve of the substance on the temperature-time graph is shown in Fig. 5.1.temperature /C90+80+70+×Y60+50+40+30time / min Fig. 5.1(a) Describe the dif...
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]...
Urine is not a pure substance. To be called a pure substance, that substance must be built with one building block. However, urine is made up of several materials that are not even bonded to each other. Urine has not one, but many building blocks and the
Which term describes a pure substance that is made up of only one type of atom? Verified Solution This video solution was recommended by our tutors as helpful for the problem above Video duration: 2m Play a video: 0 Comments Was this helpful? 0 Bookmark...
form a new substance with different properties. • Example 1- Water. Water’s chemical formula is H2O. • Mixture- a combination of substances in which the atoms of the substances are not chemically combined. This means that mixtures can be ...