Chemistry
What mineral has the chemical formula PbS?
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What symbol appears on the periodic table for the element with the atomic number 88?
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What is a vital constituent of plant and animal life, and is the key component of hemoglobin?
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What three components are needed in order to produce fire?
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What is the name for naturally-occurring alloy of gold and silver with a small amount of other metals?
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A critical component of vitamin B-12, what element is the only metal found in vitamins?
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Which of the following is produced in alkaline scrubbing and called wet slurry?
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