E1 - Name Date 1 Given S2O42(aq SO32(aq basic solution How...

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Name: __________________________ Date: _____________ 1. Given: S 2 O 4 2 - (aq) SO 3 2 - (aq), basic solution. How many electrons appear in the balanced half-reaction? A) 6 B) 1 C) 2 D) 3 E) 4 2. For the reaction cyclobutane(g) 2ethylene(g) at 800 K, a plot of ln[cyclobutane] vs t gives a straight line with a slope of - 1.6 s - 1 . Calculate the time needed for the concentration of cyclobutane to fall to 1/16 of its initial value. A) 1.3 s B) 1.6 s C) 0.63 s D) 1.7 s E) 2.3 s 3. A reaction has k = 8.39 M - 1 s - 1 . How long does it take for the reactant concentration to drop from 0.0840 M to 0.0220 M? A) 4.00 s B) 5.42 s C) 8.39 s D) 2.00 s E) 1.42 s 4. The decay constant for strontium-90 is 0.0247 y - 1 . How many grams of strontium-90 remain if 10.0 g decay for exactly 60 years? ( I know that this is new, but you can do it.) A) 0.33 g B) 1.48 g C) 7.71 g D) 0.23 g E) 2.27 g Page 1

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5. Consider the following cell: If the voltage of this cell is +0.70 V at 25 ° C, what is the standard reduction potential of the A + /A couple? A) Need more information B) +0.83 V C) +0.88 V D) +0.70 V E) -0.83 V 6. The reaction potential energy profile for the mechanism NO 2 (g) + F 2 (g) NO 2 F(g) + F(g) slow F(g) + NO 2 (g) NO 2 F(g) fast shows A)
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E1 - Name Date 1 Given S2O42(aq SO32(aq basic solution How...

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