[Q]: Sentence: If played back on a mono subwoofer system, the noise will cancel, significantly reducing the amount of rumble that is reproduced. Question: What would be a cause of low frequency sounds when listening?
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[A]: no

[Q]: Sentence: Matter commonly exists in four states (or phases): solid, liquid and gas, and plasma. Question: How many phases of matter are there?
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[A]: yes

[Q]: Sentence: The existence of the hydride anion, suggested by Gilbert N. Lewis in 1916 for group I and II salt-like hydrides, was demonstrated by Moers in 1920 by the electrolysis of molten lithium hydride (LiH), producing a stoichiometry quantity of hydrogen at the anode. Question: Who suggested that hydride anions existed?character does the H atom have in a hydride?
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[A]:
yes