Unit VI Case Study

A large population of Japanese beetles infests a plot of cropland. In response to the infesta tion, farmers treat the land with organochlorine pesticides. As a result of the treatment, the population of Japanese beetles is eradicated within the cropland, along with the popula- tions of multiple other insect species. Which of the following statements explains the most likely reason for the death of so many insect populations? Organochlorine pesticides are persistent organic pollutants that interfere with the respi- ratory system of the insect populations. Organochlorine pesticides are endocrine disruptors that interfere with the growth hor- mones of the insect populations. Organochlorine pesticides are persistent organic pollutants and interfere with the re- productive organs of the insect populations. Organochlorine pesticides are endocrine disruptors that interfere with the transmission of nerve impulses, resulting in spasms, seizures, and death of the insect populations.

Reaction 1 FeO(s) + CO(g) → Fe(1) + CO2(g) AG" > 0 Reaction 2: C(s) + CO2(g) → 2 CO(g) AGzn <0 Overall reaction: FeO(s) + C(s) → Fe(l) + CO(g) AG n < 0 Subm The chemical equations above represent the main reactions that occur during the production of Fe(l) under certain conditions. The overall reaction couples reactions 1 and 2, resulting in a < 0? thermodynamically favorable process. Which of the following best explains whether or not a particle diagram could represent how the coupling of reaction 1 and reaction 2 results in AG A particle diagram that represents the increase in the volume of gaseous product particles would be a good representation of how the coupling of reactions 1 and 2 results in a thermodynamically favorable process. A particle diagram that represents the decrease in the average kinetic energy of the particles would be a good representation of how the coupling of reactions 1 and 2 results in a thermodynamically favorable process. A particle diagram cannot represent…

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Strontium phosphate, Sr3(PO4)2Sr3​(PO4​)2​, dissociates when placed in water. This compound has a solubility of 0.112 mg/L in water at 20 °C.   Calculate the Ksp of Sr3(PO4)2Sr3​(PO4​)2​. Please write your answer using scientific notation according to the following format: 0.0010 would be writen as 1.0*10^-3.

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?

DDT (molar mass % 354.49 g/mol) was a widely used insecticide that was banned from use in the United States in 1973. This ban was brought about due to the persistence of DDT in many different ecosystems, leading to high accumulations of the substance in many birds of prey. The insecticide was shown to cause a thinning of egg shells, pushing many birds toward extinction. If a 20-L drum of DDT was spilled into a pond, resulting in a DDT concentration of 8.75 X 10-5 M, how long would it take for the levels of DDT to reach a concentration of 1.41 X 10-7 M (a level that is generally assumed safe in mammals)? Assume the decomposition of DDT is a frst-order process with a half-life of 56.0 days.

M 9:-1 الاجابة عن جميع الاسئلة General Chemistry * Write The Number Of These Perfixe Giga 2-Pico 3- Milli -1 إجابتك Give The Systematic Name 1-ZNSO4 2-Te-2 3- HCI (g) 4-PF5 5-LIOH إجابتك Express 5,515,000 in Scientific Natation 1- With 1 Signifigant Figure(SFs) 2-With 2 SFs * 3- With 3 SFs 4-With 4 SFs إجابتك The Speed of sound in air at room temperature is about 434 m/s,calculate this speed in (mph) إجابتك

How was Thin Layer Chromatography (TLC) used in organic synthesis reactions ? TLC is used to find the exact concentration of a catalyst in the reaction. TLC can speed up a reaction because silica gel is polar. TLC can separate components of a reaction mixture such as starting materials and products allowing the experimenter to identify what compounds are in the reaction mixture. TLC is used to find percentage yield of the reaction.

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.

Determine the partial pressure (in KPa) of nitrogen gas from the product of combustion when octane, C3H8, is burned with 200% theoretical air if the pressure is 10 MPa. The equation for the combustion of Octane: C3H13 + 02 + N2 → CO2 + H20 + 02 + N2 Hint: Balance the chemical equation first

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За. Bromine and methanoic acid react in aqueous solution. Br, (aq) + HCO0Н (ад) — 2Br (aq) + 2H" (аq) + Со, (g) The reaction was monitored by measuring the volume of carbon dioxide produced as time progressed. o 5 10 15 20 25 [Source: © International Baccalaureate Organization 2019] 30 20 40 60 80 100 120 140 160 Time / s [Source: © International Baccalaureate Organization 2019] Determine from the graph the rate of reaction at 20 s, in cm³ s1, showing your working. 3b. Outline, with a reason, another property that could be monitored to measure the rate of this reaction. 3c. Describe one systematic error associated with the use of the gas syringe, and how the error affects the calculated rate. 3d. Identify one error associated with the use of an accurate stopwatch. Volume of carbon dioxide / cm T m mm mo

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