Chemistry

What element has an atomic number of 40?

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What solution contains the same ratio of chemical constituents after it is distilled?
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What amino acid causes sleepiness following the consumption of a traditional Thanksgiving dinner?
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What fibrous substance, used in insulation and other products, can cause cancer?
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Which of these is a significant greenhouse gas?
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Which element has the lightest atomic weight?
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What is the stinky gas associated with swamps and anaerobic decomposition?
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The salts of which of these elements are typically water soluble?
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Which reagent is not commonly used to hydrate oplephins?
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