Q. 3. Write a detailed report on any two major fire explosions happened in Oman

Concisely describe the specific energy interactions that take place when solar radiation (in 0.4-1.5 micrometer) travels through the atmosphere and reaches the Earth surface. (list as bulletin points in a logic sequence)

how to calculate diffusivity of napthalene solid ball.?

When the total pressure is 760 mm Hg, various liquid and vapor phases for water (1) - methyl alcohol (2) mixture
The compositions at temperatures are determined experimentally as follows. The total composition is z2 = 0.6 and
temperature 76
Find our 75 mol mix, oC, phase analysis and component analysis. Of this mixture
Find the temperature at which it begins to boil and completely evaporate.

1. Definition of pesticides and its related terms (Insecticide, herbicides, etc…)
2. About four Major Classes of Pesticides and Insecticides. In what ways they are similar, and what ways are the four classes of pesticides are different? Which group is the safest to humans and the environment and why?
3. Describe major provision of FIFRA?
4. About environmental sustainable pest control methods
5. What is a monoculture? Why do they cause problems with pest control? Where can one see it?

1. Calculate the heat which is associated with the change in temperature of the water (q_water):
2. The specific heat of aluminum is 0.897 J/gºC. Calculate the heat which is associated with the change in temperature of the aluminum (q_Al):
3. Answer the following:
4. 1. Write the equation that relates q_water, q_Al and q_calorimeterin an insulated system:
5. 2. Using your answers from Q2, Q3 and Q4a, calculate the heat associated with the calorimeter, q_calorimeter:
6. Calculate the calorimeter constant, C_calorimeter:

Chart for question 1-6

Mass of metal Al: 7.4760g

Volume of water: 100mL

Mass of water:

Initial temp of water: 25 celsius

Initial temp of metal: 200 celsius

Max temp of water and metal: 27.65 celsius

1. Using the calorimeter constant determined in Part I, determine the specific heat of lead (C_Pb). Be sure to use the right equation which takes into account the C_calorimeter, and show all work and equations used for full credit:

Chart for question 1

Mass of metal Pb: 33.3590g

Volume of water: 100mL

Mass of water:

Initial temp of water: 25 celsius

Initial temp of metal: 200 celsius

Max temp of water and metal: 26.73 celsius

1500 m^3/h of a gas mixture containing 20 mole% solute and rest inert enters the absorber at 250 K temperature and 106.6 kPa pressure to remove 80% of original solute. solute free water used for absorption contains 10 mole% solute when it leaves the tower at the bottom. calculate the solvent flow rate to tower.

A Cascade aerator is used in a groundwater treatment plant to reduce the concentration of methane (CH4) and in the same time to increase the oxygen concentration. The height of each step of the cascade is 0.40 m. The design temperature is 10 0C. The following data is given:

Item

CH4

O2

CW,0

1.50 mg/L

0.70 mg/L

Cg

2 ppb

210000 ppm

kd

0.043

0.039

k (efficiency per step)

27%

25%

Calculate the saturation concentration of CH4 and O2 in water under 1 atmospheric pressure.

What is the required number of cascade steps (n) needed to achieve 91.94% removal of CH4 from water? What is the concentration of CH4 in water in mg/L after aeration in this cascade?

What is the concentration of oxygen in water in mg/L after aeration in this cascade?

What is the length of the Cascade aerator if its capacity is 15 m3/h per 1 m length of the step? The total water flow to be treated is 990 m3/h.

What is the total surface area of the cascade if the width to height ratio of the steps is 1:1?

Hydrogen sulfide is removed from natural gas through a “sweetening process” as it is toxic and its combustion produces corrosive substances. A proposed process is given below:

2H₂S_(g) + SO_2(g) --> 3S(s) + 2H₂O_(g)

In a test process, a gas stream which contains 20.0% H₂S and 80.0% CH₄ was combined with a stream of pure SO₂ prior to entering the reactor. The process produced 5000 lb of solid S, and in the product gas, the ratio of SO₂ to H₂S was equal to 3.00, and the ratio of H₂O to H₂S was 10.0. Draw the diagram. Using the extent of reaction balance, determine the following:

a.) limiting reactant (LR)

b.) fractional conversion of the LR

c.) Feed rates of the two input streams

It is well known that the emission of greenhouse gases such as carbon dioxide presents a very
grave threat to the environment. Attempts are ongoing to absorb (sequester) this gas by several
means. One such approach involves the use of vegetation, as plants utilize the gas by means of
photosynthesis.
One such plant, which has shown great promise, is the “Spekboom” (Portulacaria Afra) which
is endemic to the semi-arid Karoo region of the Eastern Cape.
 It has been estimated that fully-grown Spekboom can absorb 3.8 tonnes of carbon per
hectare of plants per year.
 If the system is fully functional, South Africa can generate 234.5 × 10ଽ ܹ݇ℎ of electricity
per year.
 Assume that 1559 pounds of CO2 is emitted per year per Megawatt-hour (MWh) of
electricity generated in the country.
Determine, by means of the use of conversion factors, how many square kilometres of
Spekboom could theoretically absorb all of this carbon dioxide?
Given: 1 hectare = exactly 10000. m2
; 1 pound = 453.59237 g; 1 tonne = exactly 1000 kg
[9]
1.2 Consider the molecule, CℓPO2. (The phosphorus atom is the central atom)

1.3 Draw the 3-D Lewis dot structure of the molecule, including all possible resonance structures.
Your structures must not show any hyper-valency. Use different symbols for the valence
electrons of the different atoms. Do not use dashes to represent bonds. Indicate all lone electron
pairs.
[4]
1.2.2 Calculate the formal charges of all atoms in all the Lewis structures. Write these values on the
structures you have drawn in question 1.2.1.
[2]
1.2.3 Calculate the bond order of the P–O bond(s). Briefly explain the meaning of your answer.
[2]

A flow rate of Va (in) = 300 [mL / min] of water is mixed in a static mixer with an aqueous solution containing an active ingredient B, at the concentration Cb (in) = 0.2 [mM]. Water density = 1003 [kg / m ^ 3], density of the aqueous solution = 1010 [kg / m ^ 3]

Calculate the volumetric flow rate, V (in) in [mL / min] of the aqueous solution containing the active ingredient B entering the static mixer, to obtain, upon exiting the mixer, an aqueous solution with a final concentration of active principle equal to C (out) = 9.5 [microM]

**i assume density mixed solution =1010 kg/m^3**

Identify and explain the three parts of the epidemiological triangle.