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Unformatted text preview: Chapter 14 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question 1) Consider the following reaction: 3A → 2B The average rate of appearance of B is given by Δ[B]/Δt. Comparing the rate of appearance of B and the rate of disappearance of A, we get Δ[B]/Δt = _____ × ( Δ[A]/Δt). A) + 2/3 B) 2/3 C) 3/2 D) + 1 E) + 3/2 1) 2) Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO 2 → 2NO + O 2 In a particular experiment at 300°C, [NO 2 ] drops from 0.0100 to 0.00650 M in 100 s. The rate of appearance of O 2 for this period is __________ M/s. A) 7.0 × 10 5 B) 1.8 × 10 5 C) 3.5 × 10 5 D) 7.0 × 10 3 E) 3.5 × 10 3 2) 3) Which substance in the reaction below either appears or disappears the fastest? 4NH 3 + 7O 2 → 4NO 2 + 6H 2 O A) O 2 B) NH 3 C) H 2 O D) NO 2 E) The rates of appearance/disappearance are the same for all of these. 3) 4) Consider the following reaction: A → 2C The average rate of appearance of C is given by Δ[C]/Δt. Comparing the rate of appearance of C and the rate of disappearance of A, we get Δ[C]/Δt = _____ × (Δ[A]/Δt). A) + 2 B) + 1/2 C) 1 D) + 1 E) 1/2 4) 1 A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g) → B(g). The following data are obtained for [A] as the reaction proceeds: Time (s) 1 10 20 30 40 Moles of A 0.124 0.110 0.088 0.073 0.054 5) The average rate of disappearance of A between 10 s and 20 s is __________ mol/s. A) 1.1 × 10 3 B) 454 C) 2.2 × 10 3 D) 9.90 × 10 3 E) 4.4 × 10 3 5) 6) The average rate of disappearance of A between 20 s and 40 s is __________ mol/s. A) 590 B) 7.1 × 10 3 C) 1.7 × 10 3 D) 8.5 × 10 4 E) 1.4 × 10 3 6) 7) The average rate of appearance of B between 20 s and 30 s is __________ mol/s. A) + 7.3 × 10 3 B) + 1.5 × 10 3 C) 7.3 × 10 3 D) + 5.0 × 10 4 E) 1.5 × 10 3 7) 8) The average rate disappearance of A between 20 s and 30 s is __________ mol/s. A) 1.6 × 10 2 B) 0.15 C) 670 D) 1.5 × 10 3 E) 5.0 × 10 4 8) A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g) → B(g). The following data are obtained for [A] as the reaction proceeds: Time (s) 1 10 20 30 40 Moles of A 0.124 0.110 0.088 0.073 0.054 9) How many moles of B are present at 10 s?...
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 Spring '10
 Prof.K
 Reaction, Rate equation

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