【题目】Carbon DioxideCarbon dioxide is a compound in which two oxygen atoms are connected to a carbon atom.At normal temperatures it is a colourless gas. Carbon dioxide is an important part of the carboncycle and essential for life on Earth. _1 Plants use the sunlight and take up the ...
解析 (i) no oxygen present/carbon dioxide does not support combustion/flame requires oxygento burn/not enough oxygenallow: carbon dioxide does not burn(ii) denser than air;(iii)oxygen present/oxygen increased/air present;carbon dioxide has escaped/carbon dioxide has diffused 反馈 收藏 ...
Argon, as mentioned before, is an inert gas that provides a stable arc and a good weld appearance.It also produces less spatter, fumes, and oxidation than carbon dioxide or oxygen. However, argon has a lower heat input and penetration than helium or carbon dioxide. Argon is mainly used for...
Since water vapor is a greenhouse gas, this humid atmosphere—perhaps denser than Earth’s present-day atmosphere, but far less dense than the atmosphere that envelops Venus today—would have efficiently trapped heat from the Sun. At first, this would have had little effect on the oceans of ...
Quicksand is usually, if not always extremely dangerous. It is denser than your body. If you put your foot in it, your foot will initially push the sand down, which will cause the water and clay to close around you. However, if the tides come in, that’s where you might be in drow...
Since water vapor is a greenhouse gas, this humid atmosphere—perhaps denser than Earth’s present-day atmosphere, but far less dense than the atmosphere that envelops Venus today—would have efficiently trapped heat from the Sun. At first, this would have had little effect on the oceans of ...
Since carbon dioxide is denser than air, it cannot be collected by the downward displacement of air. Instead, it should be collected by the upward displacement of air. 5. Conclusion: Therefore, the statement "Carbon dioxide is collected by the downward displacement of air" is false. Final Ans...
But being closer to the Sun than Earth is, enough of the liquid water on Venus would have vaporized to create a thick cover of water vapor clouds. Since water vapor is a greenhouse gas, this humid atmosphere—perhaps denser than Earth’s present-day atmosphere, but far less dense than ...
NASA's Perseverance rover has sampled ancient lake beds and discovered more about the history of water on the planet. Additionally, the rover's special equipment successfully produced oxygen from carbon dioxide, progressing the goals of future exploration (and possibly even laying foundations for the...
For long-term storage, “really the only option is to put it deep underground,” Herzog said. This requires the right geological conditions. Sandstone, a porous rock, is particularly good, he said, and a layer of denser rock on top like shale will stop the carbon seeping through. ...