CHE-325 6-2 journal

4PH3 P4 + 6H₂ What is the rate of disappearance of PH3 from 0 to 75 seconds? Time [PH₂] [P4] [H₂] 0 2.00 0 0 75 1.50 ? ? 150 1.25 0.19 1.13 225 1.13 0.22 1.31 300 1.07 0.23 1.40 RatepH3 [?] x 10 M/s Coefficient (green) Exponent (yellow) Enter

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Show the steps in the chain reaction (discovered by Rowland and Molina) that destroys the destruction of ozone in the stratosphere. CF2C12 (catalytic) + O3 + gamma rays => 02 ( equation not balanced)

The following are Federal Air Quality Standards for the US CO: 35ppm (1-hour) NO2: 0.053ppm (Actually NOx but please use NO2 to calculate) 03: 0.075 ppm SO2: 75ppb (1-hour) a) Calculate the air concentrations in ug/m³ corresponding to the standards. Detail your calculations. b) What would be the mass concentrations on Mars if the little green men would apply the same standards in terms of mixing ratio. Explain your assumptions.

3. The decomposition of N2O5 in the gas phase was studied at constant temperature, 2N2O5 (g) → 4NO2 (g) + O2(g) The following results were collected: find nature) N2O5] 0.1000 Ln[N2O5] -2.30 2.65 2.99 -3.69 -4.38 -5.08 a. Complete the table. Using the data and graph paper, plot the [N2O5] versus time and Time (s) 10g. (LN) 0.0707 0.0500 50 0.0250 100 0.0125 200 0.00625 300 400 Ln[N2O5] versus time. Determine the value of k. Which graph did you use? graph *b. On your graph of [N2O5] versus time, highlight the times it takes for each halving of the reactant concentration. What is the half-life? Using this half-life calculate k. design experiments to find the activation energy,

An exposure assessment study was conducted in a nail salon. Previous studies have indicated that airborne concentrations of methyl methacrylate are approximately 1 ppm. If the LOD of the analytical method is 0.25 ug and sampling should be conducted at a flowrate of 0.01 LPM, what is the minimum amount of time the sample should be collected to achieve a detectable concentration? Note: Methyl Methacrylate MW=100.1 g/mol A. 11.2 Minutes B. 2.7 Minutes C. 8.5 Minutes D. 6.1 Minutes

What is the role of carbon dioxide in air in Fresco Painting? What type of catalytic mechanism (heterogenous or homogenous) exist in Fresco painting? Why?

A group of students enrolled in a Physical Chemistry Laboratory class performed an experiment on the THE STUDY OF AN ADSORPTION ISOTHERM: ACETIC ACID SOLUTIONS ON ACTIVATEDCARBON. The data gathered by the group are documented in the tables below. Solve for the unknown data.   answer 1,2,3

What can contamination of reagents leads to? Unreliable results Reliable results Reproducible results Good results Catalase is the enzyme found in potatoes and It decomposes hydrogen peroxide (H202) to form water and oxygen gas. H202 + catalase - ----> H2O + 02 +E. The reaction is maintained at temperature 40 degree Celsius and there was a formation of bubbles. Based on the enzymatic reaction given, What do you think is the substance responsible for the formation of bubbles? Oxygen gas Hydrogen gas no reaction, because the enzyme catalase will be deactivated no reaction, because the enzyme catalase will be denatured Other: Based on the Fehling's test video, do you think the sugars ribose (in RNA) and the deoxyribose (in DNA) will both form a positive result (red precipitate) No Yes

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The compound diborane (B2H6) was at one time considered for use as a rocket fuel. Its combustion reaction is B2H6(g) + 3 O2(l) → 2 HBO2(g) + 2 H2O(l) The fact that HBO2, a reactive compound, was produced rather than the relatively inert B2O3 was a factor in the discontinuation of the investigation of the diborane as a fuel. What mass of liquid oxygen (LOX) would be needed to burn 234.4 g of B2H6? Answer in units of g.

Peroxynitric acid (HOONO2) is an unstable molecule that decomposes to nitric acid and oxygen: 2HOONO2(aq) → 2HNO3(aq) + O2(g)When the concentration of peroxynitic acid is graphed against time, the resulting plot is curved, but if the logarithm of this concentration is plotted, we instead get a straight line. Based on this, which statement is true? a)  This decay is a second order in peroxynitric acid. b)  The slope of the straight-line graph is the rate constant. c)  One needs the concentration of peroxynitric acid to calculate its half-life. d)  The rate law appears to be of the form -Δ[HOONO2]/Δt = k[HOONO2].

Determine whether the following statements are true or false, and explain your answer in one sentence. a) The rate law for an overall reaction 2A (g) -> B (g) is: Rate = k[A]^2 b) The rate law for an elementary step 2A (g) -> B (g) is: Rate = k[A]^2 c) The rate of an overal reaction is the rate of the slowest elementary step within its mechanism.

The degradation of CF3CH2F (an HFC) by OH radicals in the troposphere is first order in each reactant and has a rate constant of k = 1.6 * 108 M-1s-1 at 4 °C. If the tropospheric concentrations of OH and CF3CH2F are 8.1 * 105 and 6.3 * 108 molecules>cm3, respectively, what is the rate of reaction at this temperature in M>s?