Consider the most recent oil spill in the Gulf of Mexico. Describe the various mechanisms and pathways that toxins transport to the environment. What can be done to remove the toxins from the environment?

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Consider the most recent oil spill in the Gulf of Mexico. Describe the various mechanisms and pathways that toxins transport to the environment. What can be done to remove the toxins from the environment?

How energy can be converted from one form to another, giving specific examples.

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How energy can be converted from one form to another, giving specific examples.
Define what we mean by fossil fuels and explain why there are an attractive source of energy.
Describe two different energy alternatives to fossil fuels in detail.
Discuss how they work, how they compare with fossil fuels, and their relative advantages and disadvantages.

Assume that the transducer and preamplifier are able to detect signals 80 dB down from the transmitted pulse height.

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An L x L square transducer, submersed in water, is centered at the origin and is pointed down the +z-axis. A larger layer of homogeneous fat begins z=z0 and extends to the depth of penetration, so that the only possible returns are those of the interface between water and fat. The transducer is capapble of rotating towards the x-axis by θ degrees. Assume that ther is no attenuation in the water. Assume that the transmitted pulse is a gated sinusoid of duration T and height A0.
a) Assume the z0 is in the far field and derive an expression for the strength to return as a function of angle. Make approximations where appropriate and do not forget the sidelobes.
b) Assume that the transducer and preamplifier are able to detect signals 80 dB down from the transmitted pulse height. Assume also that a B-mode binary image is generated so that all signals above the detectable threshold are plotted in black and all signals below the threshold are plotted in white. Sketch the B-mode image that would result from this experiment.

Charlie Cook (see question 1 above) was able to determine the activity times for constructing his chemical contaminant tracking machine.

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Charlie Cook (see question 1 above) was able to determine the activity times for constructing his chemical contaminant tracking machine.
A) Cook would like to determine ES, EF, LS, and LF for each activity. Here are the activity times (12 marks):
Activity Time (weeks) Activity Time (weeks)
A 6 E 4
B 7 F 6
C 3 G 10
D 2 H 7
B) Determine the slack time for each activity. (3 marks)
C) Determine the total project completion time. (1 mark)
D) Identify the activities on the critical path. (1 mark)
E) Draw a Gantt chart for the project.

The activities needed to build an experimental chemical contaminant tracking machine at Charlie Cook Corp. are listed in the following table. Construct an AON network for these activities.

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The activities needed to build an experimental chemical contaminant tracking machine at Charlie Cook Corp. are listed in the following table. Construct an AON network for these activities. (3 marks)
Immediate Immediate
Activity Predecessor(s) Activity Predecessor(s)
A — E B
B — F B
C A G C, E
D A H D, F

Compare water, gatorade, and powder?

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Compare water, gatorade, and powder?

All ammonium compounds, which contain an ammonium ion (NH4+) and a negative ion, are thermally unstable.

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All ammonium compounds, which contain an ammonium ion (NH4+) and a negative ion, are thermally unstable.

A. Discuss two ways that ammonium compounds decompose when they are heated. What chemical reaction is involved in the thermal decomposition of ammonium persulfate?

B. What is the most likely reason OSHA requires ammonium nitrate to be segregated for sulfur or finely divided metals? Explain your answer.

C. What is the most likely reason OSHA requires employers to protect flooring and handling areas in buildings against impregnation by ammonium nitrate and requires that the floors be constructed without open drains, traps, tunnels or pits into which molten ammonium nitrate could flow and be confined in the event of a fire?

We saw toxic effects of ammonium for human but there are several benefits. Discuss a potential benefit of ammonium for human. Hint: pH

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We saw toxic effects of ammonium for human but there are several benefits. Discuss a potential benefit of ammonium for human.
Hint: pH

There are products on the market that allow you to make your own soda by carbonating water from a CO2 tank, then adding flavoring. When adding the CO2 gas to the water, the directions state “For best results, the water should be cold (33oF to 36oF).”

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There are products on the market that allow you to make your own soda by carbonating water from a CO2 tank, then adding flavoring. When adding the CO2 gas to the water, the directions state “For best results, the water should be cold (33oF to 36oF).”

Choose the statement below that explains why the water should be cold for best results. Please note that some of the choices are true, but are not the best answers since they do not adequately the above statement.

A. The heat of dissolution of CO2 in water is exothermic, so more CO2 will dissolve in the water.

B. The heat of dissolution of CO2 in water is zero, so less CO2 will dissolve in the water.

C. The heat of dissolution of CO2 in water is exothermic, so less CO2 will dissolve in the water.

D. The heat of dissolution of CO2 in water is endothermic, so less CO2 will dissolve in the water.

E. The heat of dissolution of CO2 in water is zero, so more CO2 will dissolve in the water.

F. The heat of dissolution of CO2 in water is endothermic, so more CO2 will dissolve in the water.

Nitric oxide, an important pollutant in air, is formed from the elements nitrogen and oxygen at high temperatures, such as those obtained when gasoline burns in an automobile engine. At 2000°C, K for the reaction N2(g) + O2(g) 2NO(g) is 0.01. Predict the direction in which the system will move to reach equilibrium at 2000°C if 0.4 atm N2, 0.1 atm O2, and 0.08 atm NO are placed in a container.

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Nitric oxide, an important pollutant in air, is formed from the elements nitrogen and oxygen at high temperatures, such as those obtained when gasoline burns in an automobile engine. At 2000°C, K for the reaction N2(g) + O2(g) 2NO(g) is 0.01. Predict the direction in which the system will move to reach equilibrium at 2000°C if 0.4 atm N2, 0.1 atm O2, and 0.08 atm NO are placed in a container.
A) The system remains unchanged.
B) The concentration of NO will decrease; the concentrations of N2 and O2 will increase.
C) The concentration of NO will increase; the concentrations of N2 and O2 will decrease.
D) The concentration of NO will decrease; the concentrations of N2 and O2 will remain unchanged.
E) More information is necessary.

The best explanation of boiling point elevation caused by dissolving sodium chloride in water is because

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The best explanation of boiling point elevation caused by dissolving sodium chloride in water is because
A) the ion-dipole interactions hold the water molecules in the liquid phase.
B) the ion-ion interactions push the water molecules out of the liquid phase.
C) the ions physically block water molecules from leaving the liquid surface.
D) the ions physically block gas water molecules from entering the water phase.
E) none of the above.

The brownish color of air in some polluted urban areas is due to:

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The brownish color of air in some polluted urban areas is due to:
A) nitrogen oxides.
B) soot.
C) sulfur oxides.
D) carbon dioxide.
E) ozone.

Wouldn’t just planing more trees, etc. go a long way toward lowering those CO2 levels?

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Wouldn’t just planing more trees, etc. go a long way toward lowering those CO2 levels?

Construct a failure rate control chart for the following data. Assume a confidence of 99.73% and the ARL equal to 2 failures per 100 hr. What is the MRL? Is the process in- control? If the process is not in-control, explain what you would do to prevent and correct this situation?

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Construct a failure rate control chart for the following data. Assume a confidence of 99.73% and the ARL equal to 2 failures per 100 hr. What is the MRL? Is the process in- control? If the process is not in-control, explain what you would do to prevent and correct this situation?

Subsample
Number
1
2
3
4
5
6
7
8
9
10

f

2
3
3
4
6
1
1
1
4
8

Hours

220
350
170
200
250
80
90
110
350
360

How is acid rain produced?

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How is acid rain produced? In which parts of the United States has acid rain
been more of a problem?

What is an acid?

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What is an acid?

What are some new insights into the structure of the atom?

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What are some new insights into the structure of the atom?

What kinds of research are being done to improve the efficiency of nuclear reactors and of the disposal of radioactive waste?

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What kinds of research are being done to improve the efficiency of nuclear reactors and of the disposal of radioactive waste?

How are magnetic fields being used to create fusion reactors?

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How are magnetic fields being used to create fusion reactors?

What work is being done in the development of improved batteries?

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What work is being done in the development of improved batteries?

What is superconductivity and what practical applications does it have (radiotelescopes, MagLevs)?

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What is superconductivity and what practical applications does it have (radiotelescopes, MagLevs)?