2023_CHEE423_Lab3_Manual

Using the data for Trials 1-3, enter the average time for the Clock reaction at room temperature: ................ s

After completing the experiment, a student performed the graphical analysis of her experimental data as outlined in the procedure. The equation of the trendline through her experimental data is y = -4216x + 5.691. Use the equation of her trendline to calculate the activation energy for the reaction of acetone and iodine with a hydrochloric acid catalyst. Enter your numerical answer below in units of Joules with four significant figures.

From the equation of the line of best fit for the temperature-rate constant data in Part C, y= -22314x + 25.181 determine the value of Ea in kJ/mol. Include a unit analysis. R is a constant equal to 8.314 J/molK. When you take the natural log of a number, the units disappear.

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.

The half-life of the radioactive Isotope Carbon-14 is about 5730 years. O Part (a) - Find N In terms of t. The amount of a radioactive element A at time t is given by the formula A(t) = Agekt, where An is the initial amount of the element and k<0 is the constant of proportionality which satisfies the equation (instantaneous rate of change A(t) : time t) = kA(t). Use the formula given above to express the amount of Carbon-14 left from an initial N milligrams as a function of time t in years. (Round k to six decimal places.) A(t) = mg O Part (b) - Find the percentage remaining. What percentage of the original amount of Carbon-14 is left after 30,000 years? (Round to the nearest tenth.) % O Part (c) - Find the age. If an old wooden tool is found in a cave and the amount of Carbon-14 present in it is estimated to be only 48% of the original amount, approximately how old is the tool? (Round to the nearest year.) years old

How many intermediates are present in the proposed mechanism of lodine clock reaction? (note: disregard balancing) 103 (aq) + HSO3 (ag) >l'(ag) + 3HSO4 (aq) (slow) 103 (aq) + 6H (aq) + 51(aq) -> 312(ag) + 3H20() |2(aq) + HSO3 (aq) + H20) -> 21 (aq) + HSO4 (aq) + 2H* (aq) Overall Reaction: 2H* (ag) + 2103 (aq) + HSO3 (aq) -> 2HSO4 (aq) + 2H200 O a. 2 O b. 3 O C. 0 O d. 1

& I consider the following reaction mechanifm - SO₂ (99) + D₂ (9) → 505 (92) 2- 2 505 (92) +503²¯ (99) →≤ 0,₂² - (99) + 50,- (99) 2. - S S ว (99) 50₁₂² (92) + 50₂² - (92) → 250 (12) - 4 3 Apply the steady State approximation to write the late law expressions

TM 31.7 & O 32 |14 5:50 TNT K/s Gen-Chem-2-Activity OBSERVE THE UNIQUE PROPERTIES OF WATER IN EVERYDAY LIFE Directions: Read and analyse the scenarios provided below about unique properties of water. The students should give the answer they feel most sure about and can be backed up by identifying other potential answers. Scenarios 1. It is a sweltering day at an outdoor concert. You walk through a misting booth, which sprays fine water droplets onto you, and for a few minutes afterward you feel much cooler. 2 You're on a road trip through the desert. You stay in a hotel with a swimming pool. Even though it's been scorching hot all day, you dive in without fear 3. You go for a hike and decide to add a powdered energy drink to your water bottle. You sprinkle in the powder and it quickly dissolves. 4. In chemistry class, you pour water into a graduated cylinder. You carefully take note of the meniscus that forms at the top 5. While sitting by the edge of a stream, you observe that some…

The slope of an Arrhenius plot was found to be -4570 K, and the intercept was found to be 3.3 with the time plotted in seconds. What is the frequency factor?  Enter your answer with two sig figs.

Which of the following must be true if the steady state assumption is to be used? Ok₁[E][S] = k₂[ES] d[ES]/dt = 0 O[E]T=[ES] k₁[E][S]=k₂[ES] -k.₁[ES] (k₂-k.1)/k₁ = 1

In a study of the rearrangement of cyclopropane to propene at 500 °C (CH₂)3 CH3CH=CH₂ the concentration of (CH₂)3 was followed as a function of time. It was found that a graph of In[(CH₂)3] versus time in seconds gave a straight line with a slope of -9.38×104 s¹ and a y-intercept of -2.02. Based on this plot, the reaction is order in (CH₂)3 and the rate constant for the reaction is

Technetium (Tc) is a by-product of the spontaneous fission of Uranium-238 and as such is of particular interest to the nuclear sector. The most common isotope is 99Tc which is unstable and decays by emission of a beta particle,with a half-life of t½ = 2.11 x 105 years.  A 99Tc sample is characterised and is found to contain 0.1 mol of the radionuclide. Determine the time required for the amount of technetium to reduce by 1% of this value

[References) Use the References to access important values if needed for this question. In a study of the gas phase decomposition of dimethyl ether at 500 °C CH;OCH;(g)- →CH4(g) + H2(g) + CO(g) the concentration of CH,OCH, was followed as a function of time. It was found that a graph of In[CH,OCH] versus time in seconds gave a straight line with a slope of -6.28x10s and a y-intercept of -3.50 Based on this plot, the reaction i Đ order in CH,OCH, and the rate constant for the reaction is zero first second Submit Answer Try Another Version 2 item attempts remaining (Previous 12 étv ll MacBook Air 80 DII DD F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 @ #3 $ & * 4 6. 7 8 W E R Y { S G J K く C V ...- ~の * 00 ラ エ B

In a study of the rearrangement of cyclopropane to propene at 500 °C (CH2)3 CH3CH=CH2 the concentration of (CH2)3 was followed as a function of time. It was found that a graph of In[(CH2)3] versus time in seconds gave a straight line with a slope of -9.38×104 s1 and a y-intercept of -1.57 . Based on this plot, the reaction is O order in (CH2)3 and the half life for the first reaction is seconds.

For the decomposition rate constant of methyl acetoxypropionate (=A) CH3COOCH(CH3)COOCH3(g) → CH3COOH(g) + CH2=CHCOOCH3(g) a value 0.0317 s-1 was found at 610 K. The decomposition is carried out at this temperature in a closed vessel having a volume of 20 dm³. This reactor initially contained 0.4 moles of pure acetoxypropionate. Assuming ideal gas phase behaviour, calculate: a) what will be the composition of the reaction mixture (in mole%) after 90 s from the start of the reaction, b) reactor pressure at this time.

The half life for the radioactive decay of U 238 is 4.5 billion years and is independent of initial concentration. Part A How long will it take for 18 % of the U-238 atoms in a sample of U-238 to decay? Express your answer using two significant figures. VE ΑΣΦ Submit Part B N= Request Answer Submit 17 ΑΣΦΑ If a sample of U 238 initially contained 1.2×1018 atoms and was formed 5.4 billion years ago, how many U 238 atoms does it contain today? Express your answer using two significant figures. Request Answer ? Pearson yr ? atoms Copyright © 2023 Pearson Education Inc. All rights reserved. | Terms of Use | Privacy Policy | Permissions ( Constants Perioo Contact Us

The decomposition of dinitrogen pentoxide gas at 318.15K is measured as the decrease of N205 concentration in partial pressures (mm): The data are shown graphically: Time (s) [N2O5] (mm) •.. 348 247 12 195 24 105 36 58 48 33 60 18 72 10 Calculate the rate constant for the reaction. Use Excel to plot the pertinent data and use linear regression to calculate the slope of the line connecting your data. Round your answer to 4 decimal places.

What is method of initial rates and what does it do?

18) 08 Veek 6 Homework # 6 Week 6 Homework Topic: Week 6 Recorded X Marc Foster's Personal M X + stuniversity.edu/courses/6957/assignments/165042 Maps EReading 5 of 16 MISSED THIS? Watch KCV 11.9; Read Section 11.9. You can click on the Review link to access the section in your e Text. The hydrogen gas formed in a chemical reaction is collected over water at 30 °C at a total pressure of 732 mm Hg . The vapor pressure of water at 30 °C is 31.8 mm Hg. deos Part A What is the partial pressure of the hydrogen gas collected in this way? Express your answer in millimeters of mercury to three significant figures. tions PH, mm Hg Next - Previous 2:14 PM 85°F Sunny 10/3/2021 ASUS VivoBook delete insert prt sc home F12 Pgdn f10 end 因 94 61 f5 backspace & 5 6 24 4. 9. 3.

The half life for the radioactive decay of potassium-40 to argon-40 is 1.26 × 10 years. Suppose nuclear chemical analysis shows that there is 0.727 mmol of argon-40 for every 1.000 mmol of potassium-40 in a certain sample of rock. Calculate the age of the rock. Round your answer to 2 significant digits. db years Submit Assignment O 2020 McGraw-Hi Education. All Rights Reserved. Terms of Uhe I Pivacy I Accessibility 1113 PM 0 49 12/17/2020 O Type here to search FULL HD 1080 Ecer Del Pg Up Pause Home F11 F12 PrtSc F6 F7 F8 F9 F10 Sa Lk SysRq Break Ins F2 F3 F4 F5 Esc F1 63 z' Nu & Backspace @ # 7 8.

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Consider the following chain mechanism (a) AH →A•+ H• K1(b) A → B• + C K2(c) B• + H• → P K3Identify the steps in the chain and use the steady state approximation to determine the rate of formation of product (a) Initiation(b) Propagationf product (c) Termination

86) 203 (9) 7 302 (9) What is the Rate Law? 1.0L vessel => in which 10 mole * 1.0 mole 03 * 1.0 mole 02 What fraction of 03 will have reacted when the rate falls to one-fourth of its initial valuc?

In a study of the rearrangement of cyclopropane to propene at 500 °C (CH2)3 CH3CH=CH2 the concentration of (CH2)3 was followed as a function of time. It was found that a graph of In[(CH2)3] versus time in seconds gave a straight line with a slope of -1.01x10-3 s-1 and a y-intercept of -2.42 . Based on this plot, the reaction is first e order in (CH2)3 and the rate constant for the reaction is s-1.

Use the data provided to calculate the half life for the decomposition of hydrogen peroxide at 20ºC

-λt Mekdon-540 is a new radioactive substance discovered by scientists. They would like to find the rate Makedon-540 decays at. The amount of Mekdon-540 can be modeler by N(t) = N₂e-t After some observations of a 100mg sample decays, we know that after 1 day it decays to 60mg. a) Determine the disintegration constant X for Mekdon-540. b) When is the half-life of Mekdon-540? c) How much Mekdon-540 will remain after 2 days? d) How fast is the sample decaying after 3 days?

In a study of the decomposition of nitrous oxide at 565 °CN2O(g)N2(g) + ½ O2(g)the concentration of N2O was followed as a function of time.It was found that a graph of 1/[N2O] versus time in seconds gave a straight line with a slope of 1.55×10-3 M-1 s-1 and a y-intercept of 0.952 M-1.Based on this plot, the reaction is     order in N2O and the rate constant for the reaction is M-1 s-1.

The following data were collected for the sensory change in beef stored while exposed directly to air at -23°C (From: Gokalp et. al. J. Food Sci. 44:146, 1979). Sensory scores were 8.4, 6.2, 5.5, 5.1 at 0, 3, 6, and 9 months in storage. Plot the data and determine an appropriate form of an equation to which the data can be fitted to obtain the reaction rate constant.

The decomposition of dinitrogen pentoxide gas at 318.15K is measured as the decrease of N,O5 concentration in partial pressures (mm): The data are shown graphically: Time (s) [N2O5] (mm) 348 6 247 12 195 24 105 36 58 48 33 60 18 72 10 Calculate the rate constant for the reaction. Use Excel to plot the pertinent data and use linear regression to calculate the slope of the line connecting your data.

In a study of the gas phase decomposition of dimethyl ether at 500 °C CH3OCH3(gCH,(g) + H2(g) + CO(g) the concentration of CH3OCH3 was followed as a function of time. It was found that a graph of In[CH3OCH3] versus time in seconds gave a straight line with a slope of -6.08×104 s and a y-intercept of -2.39 . Based on this plot, the reaction is | order in CH3OCH3 and the rate constant for the reaction is

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In a study of the decomposition of nitrous oxide at 565 °C N₂O(g) N₂(g) + ½ O₂(g) the concentration of N₂O was followed as a function of time. It was found that a graph of 1/[N₂O] versus time in seconds gave a straight line with a slope of 1.63×10-³ M-¹ S-¹ and a y-intercept of 0.463 M-¹. Based on this plot, the reaction is M-¹ S-¹. order in N₂0 and the rate constant for the reaction is