Chemistry

Which of the following is used as a rating scale to grade gasoline?

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What gas in excited state is responsible for the bright red and yellow-green colors of the aurora?
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What is the most commonly encountered form of silver?
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What are chemicals made from oil called?
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Praseodymium on the periodic table is noted by which symbol?
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A lack of iodine in your diet leads to which medical condition?
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Sodium on the periodic table is noted by which symbol?
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What are proteins that help speed up chemical reactions called?
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What orbital is described by the quantum numbers: n=3 and l=2?
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