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Correct Answer: Carbon dioxideSince the density of a gas at any given pressure and temperature depends almost entirely on its molecular weight, any gas with a molecular weight greater than Nitrogen will be heavier than air.Common gases that are heavier than air include;...Read more
Correct Answer: PolyesterBottles made of polyethylene terephthalate (PET, sometimes PETE) can be "recycled" to reuse ... Therefore, most recycled bottles are used to make lower grade products, such as carpets. ... ...Read more
Correct Answer: if…and...Read more