One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； September 23rd
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Multiple-choice question: At normal temperature and pressure, vinyl chloride is a gas that is ( ) denser than air; therefore, when performing displacement, nitrogen should be introduced into the container ( ). A、Light, bottom B、Heavy, bottom C、Light, top D、Heavy, top Answer: B、Heavy, bottom
At normal temperature and pressure, vinyl chloride is a gas that is heavier than air; therefore, nitrogen must be introduced into the container (at the top) during displacement. A、Light, bottom B、Heavy, bottom C、Light, top D、Heavy, top
D. The relative density is more than 2 times that of air.