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Chemistry
What is the fourth most abundant element in the universe by mass?
Chemistry
What is the fourth most abundant element in the universe by mass?
Hydrogen
Helium
Carbon
Oxygen
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What's the chemical symbol for water?
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A water molecule cannot hydrogen bond to which of the following?
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What post-transition metal is used to make blue and violet light-emitting diodes (LEDs) and diode lasers?
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What element was named after the planet Uranus?
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What is the symbol used on the periodic table for the element Protactinium?
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What is the common name of the chemical compound H2O?
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Which element has the chemical symbol Ca?
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What reagent could oxidize an alcohol to a carbonyl?
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