A. material B. substance C. agent D. element 相关知识点: 试题来源: 解析 D 正确答案:D解析:element n.(化学)元素;成分,要素material n.材料,原料;素材,资料。substance n.物质;实质;要旨,基本内容;根据,理由。agent n.代理人,代理商;(化学)剂。
The chemical substance used to test carbon dioxide is ___. A. limewater B. water C. alcohol D. oil 相关知识点: 试题来源: 解析 A。检验二氧化碳用澄清石灰水,即 limewater。选项 B 是水,选项 C 是酒精,选项 D 是油。所以答案是 limewater。反馈...
Is milk a pure substance? Is metal an amorphous solid? Is sodium a pure substance or a mixture? Is ice water a pure substance? Why is an element considered a pure substance? Is boron a chemical element? Is carbon dioxide a pure substance?
The substance that is used to test for the presence of carbon dioxide is ___. A. limewater B. water C. alcohol D. oil 相关知识点: 试题来源: 解析 A。石灰水(limewater)用于检测二氧化碳的存在。水、酒精和油都不能检测二氧化碳。反馈 收藏 ...
mixture混合物colloidsoluteparticlessubstances 40 Science Alive for VELS Level 5 What is a mixture? lthough the air we breathe seems like a single, or pure, substance, it is actually a mixture of many substances. Air consists of nitrogen, oxygen, carbon dioxide and other gases. Like air, al...
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.
So, is copper a pure substance or a mixture?Yes, copper is a pure substance as copper has definite properties. It is made up of only one kind of atom. A substance having one or more atoms in the same proportion throughout the substance is a pure substance. ...
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 ...
Newly thawed carbon may be decomposed by resident microbial communities, yielding carbon dioxide (CO2) or methane (CH4), greenhouse gases that can accelerate climate warming5,6. Therefore, understanding microbial carbon processing in these climatically vulnerable habitats is critical to accurately project...
It is not a heterogeneous mixture, nor is it a pure substance or a solution. Nov 27, 2007 #1 temaire 279 0 Homework Statement Air is a mixture of 78% nitrogen, 21% oxygen, 0.09% of argon, and 0.03% of carbon dioxide. What can be said about air? a) Air is a heterogenous ...