1. What problem is always of concern for the analyst when fluorescence detection is being used for a specific analyte?

2. Calibration curves for fluorescence and UV/Visible absorbance will ultimately curve at high concentrations. For each of these techniques, explain why there is curvature.

[1]- An alloy of silicon and iron (Si-Fe) has 0.25 wt% of Si. If the density and atomic weight are 2.33 ? ??3 and 28 ? ??? for silicon and 7.87 ? ??3 and 55.85 ? ??? for iron, calculate:

a) Atomic percentage of silicon and iron.

b) Density of iron in the alloy ( ?? /?3 )

. c) Average atomic weight of the alloy ( ?/ ??? )

. d) Number of moles of silicon and iron.

Two liquid streams are flowing at constant rates into a blender. One is benzene, which flows at a measured rate of 20.0L/min, and the other is toluene. The blended mixture enters a storage tank (inner diameter = 5.5m) equipped with a sight gauge. During an interval in which no liquid leaves the storage tank, the liquid level in the tank is observed to increase by 0.15 meters over a one-hour period. Calculate the flow rate of toluene into the blender (L/min) and the composition of the tank contents (wt% benzene).

1. Your company wants to buy a compressor that will operate adiabatically to compress 2 kg/s of saturated R-134a vapor at -15°C to a pressure of 1000 kPa. What is the minimum work (in kW) required? Use the right sign convention for work. Hint: The minimum work is that of the reversible process. Start by simplifying the entropy balance!

Answer: -75.92KW

2. Consider the same situation as problem 1. Your company wants to buy a compressor that will operate adiabatically to compress 2 kg/s of saturated R-134a vapor at -15°C to a pressure of 1000 kPa. What is the minimum outlet temperature (in°C) required? Hint: just like before, the minimum outlet temperature occurs when the process is reversible.

answer: 47 C

3. Consider the compressor from problems 1 and 2. You would like the effluent of the compressor to be saturated vapor at 1000 kPa. Calculate what would be the rate of entropy generation (in kW/K) if the compressor is adiabatic.

Only need the answer to this question, thanks

4. A steam turbine has an inlet flow of 3 kg/s at 3.5 MPa and 450 C with a velocity of 140 m/s. the exit of the turbine is 800 kPa and 300 C at a very low velocity. Calculate a.) the work produced in (MW) by the turbine, and b.) The entropy generated in (kW/k)

Why did the environmental engineers cycle between oxic and anoxic growth for this reactor?

One mole of an ideal gas (C_P/R=7/2), is compressed in a steady-flow compressor from 2.5 bar and 25°C to 6.5 bar and 120°C. The compressor rejects 0.5 kJ as heat to the surrounding at 293K.

Calculate:

1.     The enthalpy change of the gas (in kJ)

2.     The entropy change of the gas (in J.mol^-1)

3.     The work required for the compression (in kJ)

4.     The ideal work of the process (in kJ)

5.     The thermodynamic efficiency

The lost work (in kJ)

Experiment 7: Thin Layer Chromatography

1. What is the name of the technique you will be using in experiment No.7 lab?
   1. Thin Layer Chromatography
   2. Mass Spectrometry
   3. Thick Liquid Calorimetry
   4. Liquid Chamber Chromatography

2. TLC plates separate molecules on the basis of:
   1. Polarity
   2. Color
   3. Size
   4. Bond orientation

3. The mixture is dissolved in a fluid called the ___________ phase, which carries it through   a structure holding another material called the __________ phase.

4. The polarity of a bond between two elements can be best determined by

1. The difference in electronegativity between the elements
2. The difference in first ionization energy between the elements
3. The number of electrons shared in the bond
4. The difference in atomic radius between the elements

5. EXPLAIN the phrase “like dissolves like.”

1. Describe what figure 8.29 tells us about of North America.

2. What is Rodinia? Explain the climate issue happening at the time.

3. What is a sequence? Explain the significance of the Sauk and Tippecanoe sequences.

4. Describe the major event going on tectonically in eastern North American margin in the late Paleozoic.

Discuss the significance of project documentation and codes and standards

A diffracted x-ray beam is observed from an unknown cubic metal at angles 30.7301^o, 35.6406^o, 51.1984^o, 60.9706^o, 64.0327^o and 75.4344^o when x-ray of 0.1248 nm wavelength is used.

Find the lattice parameter (in nm) of the metal for each of the peaks.

Compare the equilibrium constant dependence on temperature with the van't Hoff Equation Comment on any differences and/or similarities.

Please type your answer

1. A heater is used to heat 100 SCM of nitrogen in a rigid vessel from 26.85^oC  to 126.85^oC. Do energy balance and calculate heat duty Q (kJ) using data from Table A-2a,b,c and A18. State your assumption and explain your results.

Define disinfection process, write the equations for the dissolution (hydrolysis) of chlorine gas in water and the subsequent dissociation (ionization) of hypochlorous acid. Draw breakpoint chlorine dosage curve, and provide explanation to each zone