In a study of the decomposition of ammonia on a tungsten surface at 1100 °C NH31/2 N2 + 3/2 H2 the following data were obtained: [NH3], M 1.31×10-2 6.55×10-3 3.28×10-3 1.64×10-3 seconds 0 441 661 771 Hint: It is not necessary to graph these data. FILL IN THE BLANKS (1) The observed half life for this reaction when the starting concentration is 1.31×10-2 M is ________s and when the starting concentration is 6.55×10-3 M is ________s. (2) The average rate of disappearance of NH3 from t = 0 s to t = 441 s is ______M s-1. (3) The average rate of disappearance of NH3 from t = 441 s to t = 661 s is __________M s-1. (4) Based on these data, the rate constant for this _______ (zerofirstsecond) order reaction is _____M s-1.

In a study of the rearrangement of ammonium cyanate to urea in aqueous solution at 50 °C NH¢NCO(aq)+(NH2)2CO(aq) the concentration of NH4NCO was followed as a function of time. It was found that a graph of 1/[NH4NCO] versus time in minutes gave a straight line with a slope of 1.74x10-2 M-¹ min¹ and a y-intercept of 2.34 M-¹. ✓order in NH4NCO and the rate constant for the reaction is M1 min 1. Based on this plot, the reaction is

Chlorine atoms react with methane, forming HCl and CH3. The rate constant for the reaction is 6.00 × 107 M–1 s–1 at 298 K. The experiment was repeated at three other temperatures, resulting in the following data: Calculate the the activation energy for the reaction in kJ/mol

The preexponential and activation energy for the diffusion of iron in cobalt are 1.1 × 10-5 m/s and 253,300 J/mol, respectively. At what temperature will the diffusion coefficient have a value of 2.1 × 10-14 m²/s? The activation energy for the diffusion of car- bon in chromium is 111,000 J/mol. Calculate the diffusion coefficient at 1100 K (827°C), given that D at 1400 K (1127°C) is 6.25 x 10-11 m/s.

In a study of the decomposition of ammonia on a tungsten surface at 1100 °C NH31/2 N2 + 3/2 H, the following data were obtained: [NH3], M 5.75x10-4 662 2.88×10-4 773 2.30x10-3 1.15x103 seconds 442 Hint: It is not necessary to graph these data. (1) The observed half life for this reaction when the starting concentration is 2.30×103 M is s and when the starting concentration is 1.15x10-3 M is (2) The average rate of disappearance of NH3 from t=0 s to t= 442 s is |Ms. (3) The average rate of disappearance of NH3 from t= 442 s to t= 662 s is ]Ms! (4) Based on these data, the rate constant for this order reaction is Ms

The half-life for the radioactive decay of U-238 is 4.5 billion years and is independent of initial concentration. D Part A How long will it take for 10% of the U-238 atoms in a sample of U-238 to decay? Express your answer using two significant figures. 195] ΑΣΦ t = 0.638 Submit Previous Answers Request Answer * Incorrect; Try Again; 4 attempts remaining Part B ? 196] ΑΣΦΑ N = 1.88. 10° If a sample of U-238 initially contained 1.4x108 atoms when the universe was formed 13,8 billion years a many U-238 atoms will it contain today? Express your answer using two significant figures. Submit Previous Answers Request Answer ? 5. X Incorrect; Try Again; 3 attempts remaining atoms.

In a study of the gas phase decomposition of hydrogen iodide at 700 K HI(g) →½ H2(g) + ½ I2(g) the following data were obtained: HI], M seconds 1.01 0.505 0.253 0.127 1.05x103 3.15x103 7.32x103 Hint: It is not necessary to graph these data. (1) The observed half life for this reaction when the starting concentration is 1.01 M is s and when the starting concentration is 0.505 M is S. (2) The average A(1/[HI]) / At from t= 0 s to t= 1.05x103 s is The average A(1/[HI]) / At from t= 1.05×103 s to t= 3.15×103 s is Ms!. (3) Based on these data, the rate constant for this order reaction is

The following data are for the decomposition of hydrogen peroxide in dilute sodium hydroxide at 20 °C. H2₂O₂(aq) > H₂O(l) + 12 O₂(g) [H₂O₂], M time, min 7.34x10-2 0 3.67x10-2 8.68 Hint: It is not necessary to graph these data. (1) The half life observed for this reaction is (2) Based on these data, the rate constant for this 1.84x10-2 9.20x10-3 17.4 min. 26.0 order reaction is min -1

SC B. The Lewis diagram for NO₂ is: |:8_N_ő:] :0 N= Recall that for predicting geometry, double and triple bonds count as only one electron pair. The electron-pair geometry around the N atom in NO₂ is There are 1 ! Q A :6: F1 @ 2 W S -8 F2 # 3 lone pair(s) around the central atom, so the geometry of NO₂ is E 20 F3 D $ 4 F4 R F LL olo LO % 5 F5 T MacBook Pro < 6 G F6 Y & 7 Ja F7 H * U DII F8 8 00 J

The following data are for the gas phase decomposition of sulfuryl chloride at 600 K.SO2Cl2(g) SO2(g) + Cl2(g) [ SO2Cl2 ], M 3.73×10-3 1.87×10-3 9.35×10-4 4.68×10-4   time, min 0 203 406 609 Hint: It is not necessary to graph these data. (1) The half life observed for this reaction is ________ min .(2) Based on these data, the rate constant for this _______(zero, first, or second) order reaction is __________min-1.