benzene has commonly been used as an industrial intermediate, but its use has a declined in recent years. Why? What is primarily used for? What has it been replaced by in many synthesis reactions?

77. Calculate Q for a stream with weeds in the channel (n = 0.035). It has an average width of 4.5 feet at gaging station A. Its average depth at the gaging station is 1.5 feet. The gradient of the water surface is 1.7 ft in the vertical over a distance of 1000 ft in the horizontal. Calculate V and then Q.

78. Why is it important to measure soil moisture? Go into the direct and indirect ways soil moisture is critical for human activities, the economy, forecasting applications etc

What role does nucleation and kinetics in general have for making a single crystal silicon wafer? Describe the process to make this, highlighting the steps where kinetics have a strong role.

Consider a gaseous feed, CA0=100, CB0=200, enters a flow reactor at T0=1000 K and ?0= 5 atm. The reaction, ? + ? → 5?, occurs in the reactor. Calculate the XA, XB and CB if the exit
stream leaves at T=400 K and ? = 4 atm. (Assume ideal gas behavior).

Conduct research to find other examples where the exclusion of a species led to dramatic changes in the ecosystem. Explain why this is the case

It is January, and you take off from New York City for a well deserved vacation in the Caribbean. After YOU REACH A CONSTANT CRUISING ALTITUDE of 30,000 ft, would you expect the pressure outside of the plane to...

Methanol is synthesized by the gas phase reaction: Stoichiometric amounts of CO and H2 are mixed in an evacuated vessel (i.e. no methanol is present initially), and the reaction is allowed to come to equilibrium. Calculate the equilibrium mole fraction of methanol under the following conditions. The equilibrium temperature and pressure are 365 K and 1 atm, the mixture behaves as an ideal gas and a more accurate description of the temperature dependence of the equilibrium constant is available where T is in K.

ln K = 21.8158+9,052/(T)-7.663ln(T)+5.4075x10-3 (T)-5.75x10-7 (T2 )-6.75x103 /(T2 )

1)What are constellations, how many are there? 2) What and where is the zodiac? 2)Describe latitude, longitude, prime meridian, RA, Dec, Celestial Equator, and NCP? 3) What is meant by zenith? Altitude, meridian? 4)How do we name the stars? 5)Why is Polaris important? Name *3* things that Polaris can tell us if we find it in the sky! 6)What is the altitude of Polaris in San Mateo? 7)What is meant by circumpolar? 8)How many degrees does your fist span APPROXIMATELY? 9) Describe the Ecliptic, What objects would we find there? 11) Describe the daily(24 hrs), (yearly)and long term(26,000 yrs) motions of the stars 12) What causes the Seasons? Why doesn’t distance from the Sun cause seasons? Describe some evidence that distance doesnt! I put a SEASONS worksheet on Canvas to help you out. You do not need to turn this in! Please contact me for solutions if you have trouble with the questions! 13)What are the solstice, equinox? When do they occur? What special things happen on those dates? 14)How does the Sun move in the sky, where does it rise/set various times of year? 15) Describe precession and its cause 16) Which direction do planets Normally move with respect to the stars? 17) What does the word planet mean in ancient Greek? 18)What is the cause of retrograde motion? 19)Be able to draw and determine Moon phases Be able to determine the rise, transit, and set times for each phase. 20)How long does it take the Moon to go through a complete cycle of phases? 21) How long does it take the Moon to orbit the Earth? 22) Which direction do the planets move around the Sun? (CW or CCW?) 23) What is meant by synchronous rotation? 24) Which direction does the Earth rotate? 25) Why are Uranus’s Seasons so extreme? 26) Be able to identify each phase of the Moon and DRAW the orientation of the Earth Sun and Moon for each phase

5. Anyone who has ever owned a car will recognize the following situations. Suggest what might be occurring in the structure of the material in each case. a. The insides of the windows develop a haze that resembles smoke, but it is not smoke. b. Vinyl seats crack after a period of time. Those areas exposed to sunlight are especially susceptible.

7 Draw a log modulus-temperature plot for a typical amorphous polymer. Indicate the
regions exhibited by the polymer (eg., glass, rubbery, viscous, leathery)?
a. To which regions do the following polymers belong at room temperature: chewing
gum, a hydrogel used as a styling gel; PVC notebook covers; rubber bands,
PlexiglassTM ?
b. Draw another similar graph and sketch comparative curves for the following
polymers: i. Amorphous ii. Crystalline iii. Crosslinked iv. High molecular weight
v. Low molecular weight

Through a double tube exchanger hot water circulates through the inner tube and water
fry through the outer tube. For countercurrent arrangement the following data is displayed:
Cold water inlet temperature Tca 24.5 ° C
Cold water outlet temperature Tcb 48.0 ° C
Hot water inlet temperature Tha 86 ° C
Hot water outlet temperature Thb 55 ° C
Cold water flow 2.00 gal / min
Calliente water flow 2.00 gal / min
Transfer area 0.65 m2 Length of the two pipes is the same 186 cm
to. Build the temperature vs. length diagram
b. Calculate the ΔT1 and ΔT2 approaches c. The temperature ranges ΔTc and ΔTh
d. The average log temperature
and. The global coefficient of heat transfer

Calculate the heat flux (W / m2) through a composite wall made of material A
whose k = 40 W / m-K and has a thickness of 30 cm, a material B whose k = 0.05 W / m-K and a
thickness of 3 cm; and a material C whose k = 0.004 W / m-K, its thickness is 0.5 cm.

Assuming normal heptane and normal octane to form ideal solutions, do the following:

d) Calculate the dew pressure of the solution at 40 ◦C.

e) Calculate the bubble temperature at 1 bar.

f) Calculate the dew temperature at 1 bar.

g) Calculate the amount and composition of vapor and liquid when a solution with z1 = 0.45 is flashed to 40 ◦C, 0.065 bar. The saturation pressures of the two components are given by the Antoine equation:

ln Pi sat = Ai − Bi/(Ci + T)

where P sat is in mm-Hg, t is in Kelvin, and the parameters

Ai , Bi , Ci , are

nC8: A = 15.9426 B = 3120.29 C = –63.63

nC7: A = 15.8737 B = 2911.32 C= –56.51

Prove for an adiabatic TP ^ 1-gamma / gamma = constant process. Use the first law of thermodynamics.

A pub opens its door for business at 6:00 PM. From 6:00 P.M. to 8:00 P.M. 50 smokers in the pub smoke 2 cigarettes per hour and each cigarette emits 4mg formaldehyde. Fresh air is introduced into the pub @ 1,000 m3/hr. At 8:00 P.M. the number of smokers in the pub increases from 50 to 75 and as a result, the fresh air flow rate is increased from 1,000 m3/hr to 1,500 m3/hr to flush out the stale air. Assume that all smokers in the pub still smoke 2 cigarettes per hour, what is the formaldehyde concentration (ppmv) in the air inside the pub @ 9:00 P.M.?