Bonus

The invention of these materials was supposedly the result of a bet between Samuel Kistler and Charles Learned over removing liquid from jelly and replacing it with gas without shrinkage. For 10 points each:
[10m] Name these ultralight materials whose low thermal conductivity and density make them useful as dust collectors in spacecraft.
ANSWER: aerogels [accept solid smokes or frozen smokes; prompt on gels; prompt on colloids or colloidal suspensions or colloidal dispersions]
[10e] Liquid can be removed from aerogels via a form of drying that places the aerogel into a pressurized autoclave until it reaches this state. Substances in this state exist beyond the point where gases and liquids exist in distinct phases.
ANSWER: supercritical fluid [accept supercritical drying; prompt on critical point]
[10h] Silica aerogels are often produced by variations of this sol-gel process used to produce silica particles. It involves hydrolysis of TEOS in alcohol followed by condensation of the resulting ethoxy·silanols.
ANSWER: Stöber process
<Chemistry>
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Summary

TournamentExact Match?HeardPPBEasy %Medium %Hard %
2025 ACF NationalsYes2118.1081%91%10%