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Packet 2: Bonus 1

Answer the following about clock reactions. For 10 points each:
[10m] This element undergoes a namesake clock reaction in which it complexes with starch to form a deep blue color. This element’s radioactive isotope 131 is used to treat Graves’ disease.
ANSWER: iodine [or I; accept iodine clock reaction; prompt on iodide or iodized by asking “what’s the element?”]
[10e] The chemical traffic light, which moves from red to yellow to green when shaken, is an example of this type of reaction whose name is a portmanteau indicating the loss and gain of electrons.
ANSWER: redox reaction [or reduction-oxidation reaction or oxidation-reduction reaction; reject “reduction” reaction or “oxidation” reaction alone]
[10h] These chemicals’ clock reaction occurs at a known rate, allowing calculation of the rates of reactions involving them during which electron transfer is shown using fishhook arrows. RAFT polymerization is catalyzed by these chemicals.
ANSWER: free radicals [accept radical clock; accept free radical polymerization; accept reversible-deactivation radical polymerization]
<Chemistry — Andrew Gao> | SHOW-ME Four Packet 2

HeardPPBE %M %H %
2116.6762%76%29%

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Conversion

TeamOpponentPart 1Part 2Part 3TotalParts
ChelseaNew Buffalo A100010M
DeWitt AU of D Jesuit100010M
Detroit Catholic Central AHillsdale Academy C10101030MEH
Detroit Catholic Central BDeWitt B1010020ME
Detroit Country Day ATaylor1001020MH
Hillsdale Academy ATraverse City Central B1010020ME
Hillsdale Academy DHolt010010E
Troy ANew Buffalo B100010M
White Cloud ATraverse City Central A0000
White Cloud BOkemos B100010M
WilliamstonNew Boston Huron100010M

Summary

TournamentEditionMatchHeardPPBE %M %H %
Rube Goldberg XIX11/20/2025✓1113.6436%82%18%
SHOW-ME Four Nationwide HS11/20/2025✓526.00100%100%60%
SPOOKY IX11/20/2025✓514.0080%40%20%