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 ...
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两个选项都不对。而D项的表达本身确实是错误的。
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...
Now, there were two possessions of the James Dillingham Youngs in which they both took a mighty pride. One was Jim's gold watch that had been his father's and his grandfather's. The other was Della's hair. Had the Queen of Sheba ...
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: ...
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]...
Copper is a homogeneous substance as the composition remains uniform throughout the bulk. Generally, all elements and compounds are homogeneous. Is Copper Oxide a Pure Substance? Yes, Copper Oxide is considered a pure substance. Copper oxide is formed when Cu reacts with atmospheric oxygen. It ...
A pure substance is any single type of material that has not been contaminated by another substance. Water is considered a pure substance if the water contains only hydrogen and oxygen. Other examples include gold, silver and salt. In chemistry, a pure substance has a definite composition. It...
A pure solid sample of Substancexis put into an evacuated flask. The flask is heated at a steady rate and the temperature recorded as time passes. Here is a graph of the results: temperature Use this graph to answer the following questio...
are due to the oxygen part - but those properties are generally less strong / intense than those of pure oxygen because of the presence of the other constituents of the mixture called 'air', e.g. many substances, such as wood, burn in air and burn even more vigourously in pure oxygen...