The Iodine "Clock Reaction" Involves the Following Sequence of Reactions $\rightarrow$

question 87

Multiple Choice

The iodine "clock reaction" involves the following sequence of reactions occurring in a reaction mixture in a single beaker.
1. IO₃¯(aq) + 5I¯(aq) + 6H⁺(aq) $\rightarrow$ 3I₂(aq) + 3H₂O(l)
2. I₂(aq) + 2S₂O₃²¯(aq) $\rightarrow$ 2I¯(aq) + S₄O₆²¯(aq)
The molecular iodine (I₂) formed in reaction 1 is immediately used up in reaction 2, so that no iodine accumulates. In one experiment, a student made up a reaction mixture which initially contained 0.0020 mol of iodate ions (IO₃¯) . If the iodate ions reacted completely, how many moles of thiosulfate ions (S₂O₃²¯) were needed in reaction 2, in order to react completely with the iodine (I₂) produced in reaction 1?

• A) 0.0020 mol
• B) 0.0030 mol
• C) 0.0040 mol
• D) 0.0050 mol
• E) 0.0060 mol

Recognize the existence and implications of sexual scripts across genders and cultures.

Comprehend the effects of heterosexism and homophobia on societal views towards sexual orientation.

Identify factors influencing sexual orientation and behaviors.

Discuss the historical and contemporary aspects of the sexual revolution and its impact on sexual norms.

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