Chemistry
What symbol appears on the periodic table for Calcium which has the atomic number 20?
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Which of the following is found in stinging insects?
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High levels of what chemical may be in trailers provided for people displaced by Hurricane Katrina?
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What is a method to indicate reactants and products of a chemical reaction using chemical formulas?
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Which of the following is a unit for measuring liquids?
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What radioactive metallic element, found in all uranium ores, has an atomic number of 89?
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