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A strip of metallic scandium, Sc, is placed in a beaker containing concentrated nitric acid. A brown gas rapidly forms, the scandium disappears, and the resulting liquid is brown-yellow but becomes colorless when warmed. These observations best support which of the following statements?
(A) Nitric acid is a strong acid.
(B) In solution scandium nitrate is yellow and scandium chloride is color less.
(C) Nitric acid reacts with metals to form hydrogen.
(D) Scandium reacts with nitric acid to form a brown gas.
(E) Scandium and nitric acid react in mole propor tions of 1 to 3.
A fermentation reactor is charged with a sterile feed of growth media at 35 °C and inoculated with a batch of microorganisms. The batch is allowed to grow for 10 days. During the growth period the temperature is maintained at 37 °C by circulating ..
Gas Absorption and Transfer Operations: Column Diameter Calculation, A gas absorption column to handle 3630 kg/hr of a gas is being designed. Based on pressure drop, entrainment and foaming considerations
What is the nature of the process fluid and what are the objectives of the two sample points and in what way do the samples reaching the instruments differ?
question 1 a using appropriate data sources to be cited correctly make a reasonably accurate sketch or graph of a
Calculate the heat when 100.0 mL of 0.500 M HCl is mixed with 300.0 mL of 0.100 M Ba(OH)2. Assuming that the temperature of both solutions was initially 25.0C and that the final mixture has a mass of 400.0 g and a specific heat capacity of 4.18 J..
A sinusoidal signal, with amplitude of 3.25 volts, is applied to a uniform quantizer of the mid-tread type whose output takes on the values 0, ±1, ±2, ±3 volts. Sketch the waveform of the resulting quantizer output for one complete cycle of the in..
Reconsider the Methanol Water Distillation. If the feed stream contains 60 mol % methanol, reevaluate reflux ratio, number of stages required, and the column diameter.
5. A patient is placed on a kidney dialysis unit three times a week. The dialyzer has a membrane area of 1 m2 and is operated in a countercurrent mode. The blood flow rate is 200 ml/min and the dialysate flow rate is 500 ml/min. Membrane permeability..
Piston arrangement: compressing air, A piston arrangement has been developed to compress air adiabatically from 360C
The resulting products are cooled and passed over a medium-temperature shift catalyst that gives an outlet composition corresponding to equilibrium at 350 °C.
The organic solution is evaporated to dryness and then the product is purified by chromatography in methanol over aluminum oxide or silica gel. Sketch a block flow diagram of the process.
Assist with the setting of design variables necessary for sizing equipment
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