【题文】Water can be a liquid, a solid or a gas. When it is a solid, it can be as hard as
17. A. heavier 18. B. water 19. C. Oxygen 20. B. Glowing splint 答案解析: 17. 氧气密度比空气大,因此可以取代空气。正确答案为 A. heavier。 18. 氧气在水中溶解度很低。正确答案为 B. water。 19. 氧气是支持燃烧的物质。正确答案为 C. Oxygen。 20. 使用发光的木条可以检测氧气。正确答案为...
For example, it is hard for China to supply energy and the traffic is much heavier. Natural environment are becoming worse and worse. The large population has been a serious problem. So far, our government has taken many measures to control the...
The present invention relates to a collection device for harmful gas that is heavier than air, the collection device being capable of collecting, with gravity or the force of gravity, harmful gas that is heavier than air and floating fine particulate matter, which are present in the air.SEO,...
it is sligtly heavier than air and fairly solublein water D its molecules is V-shaped Video Solution free crash course Study and Revise for your exams Unlock now Text SolutionVerified by Experts The correct Answer is:1 It is a colourless gas.It is an extremely poisonous substance (a slit...
Th e fresh water will remain on to p.Th e potato is heavier than th e fresh water, but it i s lighter than th e salt water. That is why th e potat o will sink halfway down.1.In which step of th e experiment do-you add the salt? A. Step 1. B. Step 2. C. Step 3...
16. Oxygen gas is( )than air, so it can replace air.A. heavierB. lighterC. No correct answer 相关知识点: 试题来源: 解析 A. heavier 氧气比空气重,因为它的密度更大。由于氧气比空气重,所以它可以取代空气。因此,正确答案是 A. heavier。
How much heavier is an alpha particle than an electron? Is tritium a gas? How much stronger is the strong nuclear force than gravity? Are radioisotopes the same as nuclear chemistry? How heavy is graphene? Is fission the same as neutron emission?
Is house gas heavier than air? Natural gas is always lighter than air, and will rise in a room if allowed to escape from a burner or leaking fitting. On the contrary,propane is heavier than airand will settle in a basement or other low level. Incomplete combustion can occur when the ga...
Fish "breathe" the dissolved oxygen out of the water using theirgills. It turns out that extracting the oxygen is not very easy -- air has something like 20 times more oxygen in it than the same volume of water. Plus water is a lot heavier and thicker than air, so it takes a lot ...