Explain the following:(i) Deltas are formed when river and sea water meet.(ii) Artificial rain is caused by spraying salt over clouds.(iii) Physisorption is multi-layered, while chemisorption is mono-layered.
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Explain the following:
(i) Deltas are formed when river and sea water meet.
(ii) Artificial rain is caused by spraying salt over clouds.
(iii) Physisorption is multi-layered, while chemisorption is mono-layered.
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- Describe the preparation of 1.67 L of 5.00% (w/v) K2Cr2O7 from the solid salt. B) what is the ppm K2Cr2O7 in the above solution?Write the balance equation of aqueous Pb(ClO3)2 with NaI. Include phases.To each digestion flask 200 mL aliquots of 10 different drinking water samples were added. Silver was extracted by a co-precipitation procedure and collected by filtration. The precipitate was digested in 200 μl hot concentrated nitric acid and diluted to 5 mL in a dilute phosphate solution. Standards were prepared according to the following table. The samples were analyzed by graphite furnace AAS. Calculate the concentration of silver in each sample. Are there any problems? How will you address each of the identified problems?
- The molal freezing point constant for copper is 23 °C/m. If pure copper melts at 1083°C, what will be the melting point of a brass made of 33.1 mass percent Zn and the remainder Cu?in the following reaction, 27.1 mL of o2(g) is collected over water at 23*C and barometric pressure 751 mmHg. After the reaction, the buret could not be lowered far enough to make the water levels equal in both the burette and beaker. In fact, you measured the difference in water levels to be 34 mm, what must have been the mass of the Ag2O decomposed? (the vapor pressure of water at 23* C is 21.1 mmHg)When oxygen becomes depleted in a landfill, some of the organic waste such as paper and cardboard slowly undergoes decomposition under sulfidogenic conditions. Write a balanced overall reaction for decomposition of glucose when sulfate serves as the electron acceptor, resulting in sulfide formation.
- A technician is setting up a laboratory to standardise ~0.0200 mol dm–3 KMnO4. What mass of Mohr’s salt [FeSO4(NH4)2SO4·6H2O] would the technician be required to weigh out to produce a 5.00 L solution of Mohr’s salt such that 25.0 cm3 aliquots of the salt would require a titre of 20.0 cm3 to standardise the KMnO4 solution?Calculate the saturation or equilibrium concentration (mg/L) of oxygen, nitrogen, and carbon dioxide in water at 0, 20 and 40degrees Celius., assuming that their percentage by volume in the atmosphere is 21%, 79%, and 0.03%, respectively at 1 atm.The solubility of calcium arsenate (Ca3(AsO4)2, molar mass = 398.078 g) in water is measured to be 0.039 g/L. What is Ksp for this salt?
- 1.Calculate the normality of the solutions containing 5.267g/L K2Cr2O7 (the Cr is reduced to Cr3+).(FW=294.19 g/mol) 2.A and B react as follows: A + B 2C. The equilibrium constant is 5.0 x 106. If 0.40 mol of Aand 0.70 mol of B are mixed in 1L, what are the concentrations of A, B and C after reaction? 3. The following data is given at a certain temperature:(1) 2N2 (g) + O2 (g) 2N2O (g) K1 = 1.2 x 10-35(2) N2O4 (g) 2NO2 (g) K2 = 4.6 x 10-3(3) ½N2 (g) + O2 (g) NO2 (g) K3 = 4.1 x 10-9Calculate the molar equilibrium constant, K for the reaction:2N2O (g) + 3O2 (g) 2N2O4 (g)1. What mass of solid Lanthanum (III) oxalate nonahydrate { La2 ( C2O4 )3 ∙ 9 H2O } can be obtained from 650 mL of 0.0170 M aqueous solution of LaCl3 by adding a stoichiometric amount of sodium oxalate?How would i estimate the number of micromoles of phosphate in tube 7, if the molarity of phosphate standard being 250.0 micromoles/liter?