Chemistry
What is a vital constituent of plant and animal life, and is the key component of hemoglobin?
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When wood has been heated to remove almost all volatile gases and leave the carbon, it is called what?
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What is essential for calcium absorption by the human body?
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On which scale is the boiling point of water 80 degrees?
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Lithium on the periodic table is noted by which symbol?
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Approximately how many chemicals are in a cup of coffee?
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The study of composition and properties of substances and matter is called?
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What element is used as a filler gas in fluorescent and incandescent light bulbs?
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