The air we breathe is a mixture of gases. What is air? A. A liquid B. A gas C. A solid D. A powder 相关知识点: 试题来源: 解析 B。我们呼吸的空气是气体的混合物。选项 A 液体错误;选项 C 固体错误;选项 D 粉末错误。反馈 收藏 ...
根据第一段What is air?Air is not just one gas.It is a mixture of different gases.什么是空气?空气不只是一种气体。它是不同气体的混合物,可知空气是不同气体的混合物。故选C。(2)A.细节理解题。根据第三段If 1,000 dots can represent the air,then 776 of them are nitrogen,210 are oxygen,...
由原文第一段的Air is not jsut one gas. It is a mixture of different gases可知正确答案.故答案为C. (4).【答案】 A 【解析】 由原文第三段的If 1000 dots can represent the air, then 776 of them are nitrogen, 210 are oxygen, 11 are argon可知正确答案.故答案为A.反馈...
Air is a mixture of different gases. What is the main component of air? A. Oxygen. B. Nitrogen. C. Carbon dioxide. D. Hydrogen. 相关知识点: 试题来源: 解析 B。解析:空气的主要成分是氮气。选项 A 氧气不是主要成分;选项 C 二氧化碳含量很少;选项 D 氢气不是空气的主要成分。
What is air? Air is not just one gas. It is a mixture of different gases. Because we can't see the gases in the air, it is difficult to think about them.There are four main gases in the air: oxygen (氧气) , nitrogen (氮气), carbon dioxide (二氧化碳)and argon(氩) .If 1,00...
Mixtureshave many of the properties of their constituents (e.g. the element 'oxygen' is part of the mixture 'air' and some of the properties of air are due to the oxygen part - but those properties are generally less strong / intense than those of pure oxygen because of the presence of...
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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.
Air is a mixture of gases primarily nitrogen and oxygen essential for respiration, whereas the atmosphere is Earth's protective layer of gases, encompassing air, water vapor, and other components.
A mixture of sand mixed with salt is an example of a heterogeneous mixture. Heterogeneous mixtures possess different properties and compositions in various parts i.e. the properties are not uniform throughout the mixture. Examples of Heterogeneous mixtures – air, oil, water, etc. 2. What is ...