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Radium-221 has a half-life of 30 sec. how long will it take for 87% of a sample to decay? (round your answer to the nearest whole number.)
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Suppose you mix one mole of sulfuric acid (h2so4) with 1 mole of sodium hydroxide(naoh). why does the ph of the solution remain below 7? ( explain so i can get better understanding! )
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The polarity of an oxygen-hydrogen bond is higher than the polarity of a nitrogen-hydrogen bond, allowing amines to be more soluble than alcohols.
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Radium-221 has a half-life of 30 sec. how long will it take for 87% of a sample to decay? (round yo...
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