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- 4. A new dam has been built with a reservoir capacity of 1,000,000 AF when full. The river flowing into the reservoir has a flowrate of 3200 cfs. While the reservoir is filling, there must be releases of water downstream from the dam of 1,600 AF/d for irrigation; 5,000 gpm for powerplant cooling; and 10 mgd for a city. How many days will it take to fill? daysA continuous source has been leaking contaminant for 2 years into a 1-D aquifer. The steady state dilution attenuation factor DAF for the aquifer is 100. DAF = Concentra- tion at source/concentration at receptor well. Source concentration 1200 mg/L (a) What is the concentration of benzene at a receptor well after 2 years. (b) What is the concentration of benzene at a receptor well in 2 years, if there is first order decay at a rate of 0.01 (1/day).The progress of the reaction between Iodine ions and potassium iodate(V) can be followed by withstanding samples of the reaction mixture at various times, quenching and then titrating with standard thiosulphate solution. The reaction equation is: I(aq) + IO3(aq) + 6H+(aq) + 4e ➡ I2(aq) + 3H2O(l) In one such experiment the following data were obtained. (see figure below) Determine the order of the reaction with respect to I(aq) and IO3(aq) ions Write the rate expression for the reaction.
- OSHA's Hazard Communication Standard requires chemical manufacturers to evaluate hazards relating to their products and provide a Safety Data Sheet in accordance to the Globally Harmonized System (GHS) in which the use of pictograms (see Figure 1) is required to communicate hazard information. Predict (with reasons) two (2) hazards related to each of the two activities below, and assign two (2) relevant pictograms listed in Figure 1 to each of the two activities. Activity 1: Removing diethyl ether (last opened in 2019) using a rotary evaporator. Activity 2: Using carbon monoxide gas as a reducing agent to reduce iron chloride. Figure 1. Pictograms advised by the Globally Harmonized System for communication of chemical hazards.A steady-state process to recover crystalline potassium chromate (K,CrOz) from an aqueous solution of this salt is required. Four thousand kilograms per hour of a solution that is one-third K,CrO, by mass is joined by a recycle stream containing 36.4% K2CrO7, and the combined stream is fed into an evaporator. The concentrated stream leaving the evaporator contains 49.4% K,CrO; this stream is fed into a crystallizer in which it is cooled (causing crystals of K,CrO, to come out of solution) and then filtered. The filter cake consists of K,CrO, crystals and a solution that contains 36.4% K,CrO, by mass; the crystals account for 95% of the total mass of the filter cake. The solution that passes through the filter, also 36.4% K,CrO,, is the recycle stream. 1- Draw the flowchart of the system and put all known information. 2- Calculate the rate of evaporation, the rate of production of crystalline K,CrO7, the feed rates that the evaporator and the crystallizer must be designed to handle, and…37 - + Sota) - Sco(@)) + 540(6) What wellume (in L) of oxygen at STP is required to produce 48.0 L of CO.(d) at SATP? Express your answer with three significant digits. De not include units! CH) Mat) A sample of rainwater is poured into five test tubes. A different indicator is added to each test tube. Four of the observations are recorded in the following table Indicator bromocresol green blue phenolphthalein methyl red phenol red chlorophenol red Colour ? colourless yellow yellow The colour of the chlorophenol red indicator would be red An unknown ionic solid is dissolved in distilled water to make a blue aqueo following cations did the ionic solid most likely contain? Il Proctorio is sharing your screen. Stop sharing DELL Hide a green flame. Which c
- Pressure (A) Explain the term pressure and state its S.I. unit. (B) Explain Henry’s law. (C)A bottle of H2 has just been received by the technicians in DkIT for use in the instrumentation lab. It is a 47 litre cylinder at a pressure of 50 atmospheres. The normal working pressures is 2 bar. (i) To what volume of gas will that equate at the working pressure? (ii) For how many hours will the gas last if it used at the rate of 0.5dm3 per hour? D)You see your best friend at the bar and you walk up behind her. You accidentally startle her and she takes a step backwards. Unfortunately, she is wearing high heels and her heels come down on your foot. She weighs only 55kg but the size of her heel is 6mm by 6mm.Determine the pressure that she applies on your foot. (E) If a diver dives to a depth of 35 m what will be: (i) the pressure in Pascals due the water column? (3 marks) (ii) the pressure of the air in…Dexamethasone is a corticosteroid used in a wide range of conditions for its anti-inflammatory and immunosuppressant effects. It was tested in hospitalized COVID-19 patients in the United Kingdom's national clinical trial recovery and according to preliminary findings shared with WHO, for patients on ventilators, the treatment was shown to reduce mortality by about one third, and for patients requiring only oxygen, mortality was cut by about one fifth. Given the structure of dexamethasone, how many chiral centers are present in its structure? Он ... HO А) 6 B none of these D) 9 E) 7 .||I CO5R) The net ionic equation for formation of an aqueous solution of Nil2 accompanied by evolution of CO2 gas via mixing solid NICO3 and aqueous hydriodic acid is A) 2NICO3 (s) + HI (aq) - 2H20 (1) + CO2 (g) + 2N12+ (aq) 2H20 (1) + CO2 (g) + Ni2+ (aq) + HI (aq) B) NICO3 (s) + I (aq) O NICO3 (s) + 2H* (aq) H20 (1) + CO2 (g) + Ni2+ (aq) 2H20 (1) + CO2 (g) + Nil2 (aq) D) NICO3 (s) + 2HI (aq) E) NICO3 (s) + 2HI (aq) H20 (1) + CO2 (g) + Ni2+ (aq) + 21- (aq) Answer. C
- Dexamethasone is a corticosteroid used in a wide range of conditions for its anti-inflammatory and immunosuppressant effects. It was tested in hospitalized COVID-19 patients in the United Kingdom’s national clinical trial recovery and according to preliminary findings shared with WHO, for patients on ventilators, the treatment was shown to reduce mortality by about one third, and for patients requiring only oxygen, mortality was cut by about one fifth. Given the structure of dexamethasone, how many chiral centers are present in its structure?Unit 7A: RA--Chemical Reactions and Stoichiometry 15/20 answered Close Homework . Due in 4 hours Molten iron and carbon dioxide gas are products in the industrial iron making process which passes carbon monoxide through molten iron ore, Fe203, at 1500°C. Write a balanced chemical equation for the production of iron. Chem 7 8 9 H 4 6 1 2 3 mol y g mol-1 DI + || SHOWIn a study of the gas phase decomposition of dinitrogen pentoxide at 335 K N,O;(g2 NO,(g) + % O2(g) the concentration of N2Og was followed as a function of time. It was found that a graph of In[N2O3] versus time in seconds gave a straight line with a slope of -6.96x10-3 s1 and a y-intercept of -1.41. Based on this plot, the reaction is order in N2Og and the rate constant for the reaction is s-!.