Chemistry

What element was known in ancient times and referred to in Genesis as "brimstone"?

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What are proteins that help speed up chemical reactions called?
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What is the second most common metal on Earth, and the most widely-used metal?
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Which of these is a significant greenhouse gas?
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The ignition of materials stored in bulk is?
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Which of the following is not a heavy metal?
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Which is a chemical often injected into lips for plastic surgery?
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Which of these can take on either a positive or negative charge, typically being a protein?
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What is the main active chemical in marijuana?
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