22 Helium is a noble gas.Which statement is correct? A A A helium atom has eight electrons in its outer shell. B Helium exists as diatomic molecules. C Helium is used as an inert atmosphere in lamps. D There are no naturally occurring chemical compounds of helium. 相关知识点: 试题来...
Helium has a lower density than air, nitrogen and oxygen. The low density of gas results in a lowering of the Reynolds’ number and thus a return from turbulent to laminar flow in some situations . By increasing laminar flow, the efficiency of breathing is increased. This physical characterist...
[03:03.40]However, because there is very little helium [03:07.40]in the Earth's atmosphere, [03:09.44]leaks can be easily detected. [03:12.32]This makes the gas important [03:14.84]for identifying possible problems [03...
Consider the substance: helium gas. Classify this substance as a pure substance or a mixture. Explain or prove your answer. Give three reasons why carbon is preferred over hydrogen in the relative atomic mass of an atom. Why, for the ionization of gas, is lower pressure more favored than ...
网络氦气是惰性气体;氦气是钝气 网络释义
必应词典为您提供Helium-is-a-monatomic-gas的释义,网络释义: 氦是单原子气体;氦是单原子气体收藏;
7 A small cylinder of compressed helium gas is used to inflate balloons for a celebration.(a)(i) In the box below, sketch a diagram to represent the arrangement of helium molecules in a balloon.[2](ii) State and explain how the size of the attractive forces acting between the molecules...
In this lesson, you'll learn how to fly away as you discover facts about helium, which is a gas that can lift things in the air. Read on to find out more about helium and how it's used in medicine and science. Related to this QuestionWhat...
2.根据第三段内容可知,“ Jupiter's atmosphere is special because it is the solar system's largest atmosphere. It is mostly made up of hydrogen(氢气) and helium(氦气). ”木星的大气层很特别,因为它是太阳系中最大的大气层。它主要是由氢(氢气)和氦(氦气)。故填Because it's made mainly of ga...
U.S. Helium Supply Is Running Out of Gas; As Demand Grows and Prices Increase, Many People Are Calling for ConservationKim McGuire