4. We have called plate tectonics a scientific revolution. What other scientific revolutions do you know about? How is the plate tectonics revolution similar to, or different from, other revolutions, such as the Copernican revolution in astronomy? 5. What is the tectonic environment of the place where you live or attend school? Do you live near a plate margin? If so, what type is it? Or do you live in the middle of a plate? If so, which one?

Steam at 400°F flows through a 2-in (ID) copper pipe having a thickness of 0.25 in. The outside surface of the pipe is insulated with 1-in-thick layer of fiberglass and 0.008-in-thick layer of aluminum. The outside surface of the insulation is exposed to air at 80°F. The convection coefficients for steam and air are 25 and 12 Btu/h-ft2 -°F, respectively. The thermal conductivity of fiberglass is 0.022 Btu/h-ft-°F. Conductivities of metals may be taken from Geankoplis. a. Calculate the rate of heat transfer for 30-ft length of the pipe in Btu/h. b. What are the interface and surface temperatures? c. Calculate the overall heat-transfer coefficient based on the outside pipe area

1) Use the table below to answer the questions that follow.

Thermodynamic Quantities for Selected Substances at 298.15 K (25 °C) __

Substance ΔH ° f (kJ/mol) ΔG ° f (kJ/mol) S (J/K-mol)

Calcium

Ca (s) 0 0 41.4

CaCl 2 (s) -795.8 -748.1 104.6

Ca 2 + (aq) 226.7 209.2 200.8

Chlorine

Cl 2 (g) 0 0 222.96

Cl- (aq) -167.2 -131.2 56.5

Oxygen

O 2 (g) 0 0 205.0

H 2O (l) -285.83 -237.13 69.91

Phosphorus

P 2 (g) 144.3 103.7 218.1

PCl 3 (g) -288.1 -269.6 311.7

POCl 3 (g) -542.2 -502.5 325

Sulfur

S (s, rhombic) 0 0 31.88

SO 2(g) -269.9 -300.4 248.5

SO 3(g) -395.2 -370.4 256.2

The value of ΔH° for the oxidation of solid elemental sulfur to gaseous sulfur dioxide,

S (s, rhombic) + O 2 (g) → SO 2 (g) is __________ kJ/mol.

a) +0.00

b) +11.6

c) +269.9

d) -11.6

e) -269.9

2) Use the table below to answer the questions that follow.

Thermodynamic Quantities for Selected Substances at 298.15 K (25 °C)
__
Substance ΔH ° _f (kJ/mol) ΔG ° _f (kJ/mol) S (J/K-mol)
   
Calcium
Ca (s) 0 0 41.4
CaCl ₂ (s) -795.8 -748.1 104.6
Ca ₂⁺ (aq) 226.7 209.2 200.8

Chlorine  
Cl ₂ (g) 0 0 222.96  
Cl- (aq) -167.2 -131.2 56.5

Oxygen  
O ₂ (g) 0 0 205.0
H ₂O (l) -285.83 -237.13 69.91

Phosphorus  
P ₂ (g) 144.3 103.7 218.1
PCl ₃ (g) -288.1 -269.6 311.7
POCl ₃ (g) -542.2 -502.5 325

Sulfur  
S (s, rhombic) 0 0 31.88
SO ₂(g) -269.9 -300.4 248.5
SO ₃(g) -395.2 -370.4 256.2


The value of ΔG° at 25 °C for the oxidation of solid elemental sulfur to gaseous sulfur trioxide,

2S (s, rhombic) + 3O ₂ (g) → 2SO ₃ (g)

is __________ kJ/mol.

Hypothesis: Traffic congestion around the school will affect the air quality and will cause air pollution, and increase noise pollution.

* Can you write an essay (paragraph) about someone you interviewed to prove the hypothesis?

I have a report about cold process soap and my doctor want answers of these qusestions...

outcomes:

1. some technical skills in cold process soap.?
2. Work ethics and values in cold process of soap?
3. Employee responsibilities at work?
4. Causes and consequences of workplace accidents.?

1. Formaldehyde can be produced by oxidation of C2H4 and the following reaction may occur.

C2H4 + ½ O2  C2H4O C2H4 + 3O2  2CO2 + 2H2O

Using molecular balance method. Equimolar quantity of C2H4 and O2 was used and the product gas analysis shows 28.57% C2H4O, 11.43% CO2, 11.43% H2O, 22.86% C2H4 and 25.71 % O2. Calculate the % conversion of C2H4 and % Yield of C2H4O.

Example 2.7 Gas Phase Reaction
Gas phase reaction is taking place in a continuous reactor. Stoicliioinetric proportions of

CO2 and H2 are fed to tile reactor at +00o C. The reaction proceeds to 80'a completion.
Given I mol of carbon dioxide, estimate the I)eat tllat dust be provided or removed, if tile
gas exit steams are to be kept at 500'C. Perform the energy balance using tile lleat of
reaction method at two reference teniperatuies (500'C and 25'C) and the beat of

formation method

Question 1

A) Describe the biogeochemical cycle of carbon as it moves into and through organisms and back to the environment. What are the major human impacts on the carbon cycle? What is so important and significant about these impacts?

B) Describe the predator-prey relationship between the moose and wolves of Isle Royale. How are they linked? What other factors influence these two populations?

14. The Seasons are primarily caused by

A. Volcanic eruptions

B. Changing Distance to the Sun

C. Gravitational pull of the moon

D. Earth's Axial Tilt

The air at the entrance to a grain dryer is 40.0 ° C and 20.0% RH. The debit

is 300.0 L / s. The dryer extracts 7,000 kg / h of grain water. The air temperature at

dryer outlet is 30.0 ° C. What is the relative humidity (%) of the air leaving the dryer?

The total pressure everywhere is 101.3 kPa.

Yes debit means flowrate of air entering.

What is the size of cough and sneezing droplets and how far they can travel? (try to calculate the distance and give reference of scientific studies only. You can use video or images to explain your answer wherever needed)

find solution of the following question:

a) propose a strategy to form the strongest Al 2024, and List two main drawbacks of such a material.

b) Precipitation hardening ( increases/decreases ) the yield strength of materials

In a static bed, how can we describe the forces responsible for the initiation or non-initiation of grain or sediment movement from a static bed.

One way to makebromine is to react HBr and O2to form Br2and H2O. Air (21 mole% O2, 79 mole% N2)is fed to provide 35% excess oxygen, and the fractional conversion to HBr is 85%. (a)Calculate the mole fractions of the product stream components, using atomic species balances in your calculation.(b)Repeat (a) but use the extent of reaction equations instead.