(dissolving or reacting) . All gases are less dense than liquid water and will displace the water downwards. No good for soluble gases like ammonia, hydrogen chloride, nitrogen dioxide or sulphur dioxide. You can collect in inverted gas jar if bigger sample required.You have to watch for 'sucking back' effects. Answer   Hydrogen can be collected by the downward displacement of water because of two reasons: it is less dense than water, and so rises to the surface, and it â¦ is not very soluble in water, and so nearly all the gas can be collected because very little is dissolved in the water.
preserve - a domain that seems to be specially reserved for someone; medicine is no longer a male preserve. 1  arena, domain, sphere, orbit, area, field - a particular environment or walk of life; his social sphere is limited; it was a closed area of employment; he's out of my orbit.
The portion of goods or property that has been saved or remains after some type of casualty, such as a fire. The term salvage is defined more specifically depending on the industry referring to it. In business, salvage is any property that is no longer useful but has scrap value. An example of business salvage is obsolete equipment. In insurance, salvage is the portion of property that the insurance company takes after paying the claim for the loss.