Use the data in the following image to answer this question. a.The reaction involved the neutralization of xxxmol of HCl, therefore, calculate the molar heat of neutralization.
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Use the data in the following image to answer this question.
a.The reaction involved the neutralization of xxxmol of HCl, therefore, calculate the molar heat of neutralization.
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- using the following information to construct a valid hypothesis addressing the effect of pH and temperature on the hydrolysis of starch. Per bench, prepare the stock amylase enzyme solution by adding distilled water to the powdered enzyme in the flask , each bench will share one flaks of enzyme solution. per groups, turn on the spectrometer and set the wavelength to 560nm.allow the instruments to warm up for at least 10 minutes. per group, set up 17 cuvettes in a Styrofoam rack. Add 3 drops of iodine (IKI) to each coveter. per group, prepare the “black” cuvette by rapidly adding 3 mL of maltose standard solution to one of The prepared cuvettes containing IKI. Rapid addition of the maltose will mix the maltose and IKIThe average bond enthalpies of the C—F and C—Cl bondsare 485 kJ/mol and 328 kJ/mol, respectively. (a) What isthe maximum wavelength that a photon can possess andstill have sufficient energy to break the C—F and C—Clbonds, respectively? (b) Given the fact that O2, N2, andO in the upper atmosphere absorb most of the light withwavelengths shorter than 240 nm, would you expect thephotodissociation of C—F bonds to be significant in thelower atmosphere?Chlorophyll absorbs photons strongly in two bands, one between 340 and 450 nm and the other between 650 and 680 nm. Chlorophyll collects and transfers the photon energy to fix CO2 into carbohydrate CH2O units according to CO2 + H2O → (CH2O) + O2 where the (CH2O) indicates one carbon unit of the carbohydrate. The average enthalpy change for the addition of a carbon unit to a carbohydrate is ΔH = 485 kJ/mol. What is the minimum number of 660 nm photons needed by chlorophyll to add a carbon unit to a carbohydrate? (Remember that there’s no such thing as a partial photon.) Please no copy paste from anywhere
- Chlorophyll absorbs photons strongly in two bands, one between 340 and 450 nm and the other between 650 and 680 nm. Chlorophyll collects and transfers the photon energy to fix CO2 into carbohydrate CH2O units according to CO2 + H2O → (CH2O) + O2 where the (CH2O) indicates one carbon unit of the carbohydrate. The average enthalpy change for the addition of a carbon unit to a carbohydrate is ΔH = 485 kJ/mol. What is the minimum number of 660 nm photons needed by chlorophyll to add a carbon unit to a carbohydrate? (Remember that there’s no such thing as a partial photon.) Please no copy pasteA Dubosq colorimeter consists of a cell of fixed path length and a cell of variable path length. By adjusting the length of the latter until the transmission through the two cells is the same. the concentration of the second solution can be inferred from that of the former. Suppose that a plantdye of concentration 25 μg dm-3 is added to the fixed cell. the length of which is 1.55 em. Then a solution of the same dye. but of unknown concentration. is added to the second cel l. It is found that the same t ransmittance is obtained when the length of the second cel l is adjusted to 1.18 em. What is the concentration of the second solution?A sample of body serum is to be analysed for sodium by flame emission spectroscopy. 1.00cm' aliquot of serum was pipetted into each of two 50.0cm' volumetric flasks. The first flask was diluted to volume with deionised water. The absorbance of this first solution was0.350. To the second flask 10.0 cm' of a 25.0 ppm sodium standard was added and the flask made up to volume with deionised water. The absorbance of this second solution was 0.720.(i) Calculate the concentration of the sodium in the body serum in mg dm-3.
- 1. Calculate the mean free time of an electron having a mobility of 1000cm2/V-s at300K; also calculate the mean free path (i.e., the distance traveled by an electronbetween collisions). Assume mn =0.26m0 in these calculations.(HINT: Use the relation between the mobility μ, the effective mass m, and themean-free-time τ, the electron's thermal velocity vth, and the mean-free-path lList and describe all advantages of XRF and NAA techniquesIt is estimated that the net amount of carbon dioxide fixed byphotosynthesis on the landmass of Earth is 5.5 * 1016 g>yrof CO2. Assume that all this carbon is converted into glucose.(a) Calculate the energy stored by photosynthesis onland per year, in kJ. (b) Calculate the average rate of conversionof solar energy into plant energy in megawatts, MW11W = 1 J>s2. A large nuclear power plant produces about103 MW. The energy of how many such nuclear power plantsis equivalent to the solar energy conversion?Integrative Exercises
- The concentration of Na in plant materials are determined by flame atomic emission. The material to be analyzed is prepared by grinding, homogenizing, and drying at 103 ºC. A sample of approximately 4 g is transferred to a quartz crucible and heated on a hot plate to char the organic material. The sample is heated in a muffle furnace at 550 ºC for several hours. After cooling to room temperature the residue is dissolved by adding 2 mL of 1:1 HNO3 and evaporated to dryness. The residue is redissolved in 10 mL of 1:9 HNO3, filtered and diluted to 50 mL in a volumetric flask. The following data are obtained during a typical analysis for the concentration of Na in a 4.0264-g sample of oat bran. Calculate the weight percent of Na in the plant sample.What is the value of [S] with v = 0.5Vmax?6.3 What is [Cd2+] when Ecell reaches 0.015 V? Explain fully