Chemistry
What symbol appears on the periodic table for Thorium which has the atomic number 90?
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What element is the basis for organic chemistry, as it occurs in all living organisms?
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What symbol appears on the periodic table for the element with the atomic number 106?
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Which element has the highest boiling point at 5933.2 Kelvin?
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Which of the following activities is an example of changing a physical property?
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A water molecule cannot hydrogen bond to which of the following?
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What makes matter expand when it's heated and contract when it's cooled?
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The Diels-Alder reaction is an example of which class of reactions?
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