一、 写出画线词语的汉语意思。1. Air is a mixture, not a compound of gases.2. I need to buy a new computer monitor.3. The monument was built in memory of George Washington, the first President of the United States. 相关知识点: 试题来源: 解析 1.混合物 2.显示器 3.纪念碑 ...
百度试题 结果1 题目7)Air is aof elements.A.mixtureB. compound C. atomD. material 相关知识点: 试题来源: 解析 7)A 反馈 收藏
百度试题 结果1 题目3. Air is a mixture (mix), not a compound of gases. 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
百度试题 结果1 题目3. Air is amixture(mix),not a compound of gases. 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
The present invention provides a new composite material comprising a porous matrix made of metal, metal alloy or semiconducting material and hollow fullerene-like nanoparticles of a metal chalcogenide compound or mixture of such compounds. The composite material is characterized by having a porosity ...
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...
Air pollution is well recognized as a major risk factor for chronic non-communicable diseases and has been estimated to contribute more to global morbidity and mortality than all other known environmental risk factors combined. Although air pollution contains a heterogeneous mixture of gases, the most...
Pure substances and mixtures are further classified into element or compound and homogenous mixture or heterogeneous mixture. Answer and Explanation: Mixtures are formed by the combination of more than one element. (a) Air Air that mostly contains ni...
Organic compounds react with HOCl continuously on solid surface until the disinfectant or compound is depleted (Weschler and Carslaw, 2018). Meanwhile, HOCl can evaporate and disintegrate to generate free chlorine (Cl2). Other volatile reactive species, such as chlorine radical (Cl.) and hydroxyl ...
More importantly, individual transformation products can be more toxic and up to an order-of-magnitude more persistent than the parent chemicals, such that the overall risks associated with the mixture of transformation products are also higher than those of the parent flame retardants. Together our...