Is bronze a pure substance? Is air a pure substance? Is blood a pure substance? Is water a pure substance? Brass is an alloy of which two metals? What is a pure substance in chemistry? Is blood a mixture or pure substance? Are alloys pure or impure substances?
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 ...
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...
Oxygen is not a compound, but a diatomic molecule, and carbon dioxide is a compound.In summary, air is a mixture of several gases, with the majority being nitrogen and the rest being oxygen, argon, and carbon dioxide. It is not a heterogeneous mixture, nor is it a pure substance or a...
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...
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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: ...
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a compound or a single element. The material is no longer a pure substance if it has been mixed with another pure substance. Two pure substances mixed together is known as a mixture. Scientists often use filtration to separate pure substances from a mixture in order to analyze the materials....
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