I need help with my homework assignment
I need help with this assignment some of it i did .I need it completed everything which include the question
"Looking for a Similar Assignment? Order now and Get 10% Discount! Use Code "Newclient"
Water, Water, Everywhere
Water, Water, Everywhereatus: Not Scheduled COMPETENCIES TO MASTERCan identify and explain key concepts in environmental science, such as water, carbon, nitrogen and phosphorus cycling and biodiversityCan identify and explain the basic principles of population ecology, such as population growth and distributionCan identify major environmental problemsCan analyze and critique leading solutions to major environmental problemsCan identify and analyze ethical issues presented by scientific and technologic developmentsCan solve practical problems using measurements such as time, temperature, distance, length and volumeOverview
Human activity changes the natural environment, and now there are more humans than ever. In fact, there are over seven billion people in the world, and people make, use and throw out a lot of stuff. How does all of that affect the environment, and what, if anything, should we do about it? In this Project, you will create a report that addresses these questions by tracking the journey of a single use water bottle from its beginnings as raw materials all the way through its transportation and consumption to its disposal.
Directions
As office manager, you are responsible for directing what the Food Services Department supplies at breakfast and luncheon meetings. For drinking water, you can choose to purchase water bottles or serve chilled tap water and ice served in reusable water pitchers and glasses. You have already determined that the difference in cost is negligible, so you can choose based on a different factor: environmental impact. Of course, your boss will want to know how you came to your decision. So, you will produce a report, supported by research and mathematical calculations.
First, complete the Water Bottle Tracking Worksheet. Then, create a report in which you discuss effects of human actions on the environment related to the water bottle life cycle. The calculations you make on the worksheet will give you some ideas and figures to supplement your discussion specific to transportation; other resources will offer different angles of approach for your analysis. You may include charts, diagrams or other graphics to enhance your materials, but be sure to write in your own words and cite sources as necessary.
In your report:Describe the cycles of four chemicals essential to life on earth: water, carbon, nitrogen and phosphorus. Be sure to use appropriate key terms and explain them in your own words. Consider:How do the cycles normally function?How does the production cycle of water bottles change each of the cycles?Explain biodiversity and how it is affected by human transportation (that is, transportation-related systems such as trucking and manufacturing) as detailed in the worksheet and other resources.Explain the logisitic population-growth model. How do humans live in relation to this model? How does this affect the environment?Select four different variations from the normal processes identified in parts 1, 2 and 3 above. Offer at least one possible restorative measure for each variation, explaining how each measure could mitigate negative effects on the processes you described. Analyze each restorative measure critically by addressing the following questions:What benefits would each measure have?What drawbacks might result from adopting a given intervention?What kinds of complications could make the adoption difficult?Identify and discuss at least three different ethical issues that face humans (as consumers, citizens, businesses or governments) due to human population growth and/or consumption of resources. Consider the information and ideas you have developed in researching the topics above, as well as the results of the Water Bottle Tracking Worksheet.
DELIVERABLES Completed Water Bottle Tracking Worksheet
Accepted File Types: .doc, .docx, .odt, .rtf, .txt, .pdfReport
Accepted File Types: .doc, .docx, .odt, .rtf, .txt, .pdf
"Looking for a Similar Assignment? Order now and Get 10% Discount! Use Code "Newclient"
Balance: HBr + KHCO3 reacts to form H2O+KBr+CO2
Balance: HBr + KHCO3 reacts to form H2O+KBr+CO2
"Looking for a Similar Assignment? Order now and Get 10% Discount! Use Code "Newclient"
how can emulsifiers be used to clean an oil spill in the atlantic ocean
how can emulsifiers be used to clean an oil spill in the atlantic ocean
"Looking for a Similar Assignment? Order now and Get 10% Discount! Use Code "Newclient"
a 3.20g sample of salt dissolves in 9.10g of water to give a saturated solution at 25C. What is the…
a 3.20g sample of salt dissolves in 9.10g of water to give a saturated solution at 25C. What is the solubility of the salt?
"Looking for a Similar Assignment? Order now and Get 10% Discount! Use Code "Newclient"
write good Title and then respond to the to posts in the picture attached
Ensure that the title for an article on the antioxidant effects of blueberries is specific, complete, concise, and unambiguous. The title should convey the following facts:
Blueberries have an antioxidant effect
Eating blueberries increases plasma antioxidant capacity
If milk/milk protein is digested together with blueberries, no increase in plasma antioxidant capacity is observed
"Looking for a Similar Assignment? Order now and Get 10% Discount! Use Code "Newclient"
Chemistry questions help
1. If 4.168 kJ of heat is added to a calorimeter containing 75.40 g of water, the temperature of the water and the calorimeter increases from 24.58 ° C to 35.82 ° C. Calculate the heat capacity of the calorimeter (in J/ ° C). The specific heat of water is 4.184 J/g• ° C.
a.
622 J/ ° C
b.
55.34 J/ ° C
c.
315.5 J/ ° C
d.
25.31 J/ ° C
e.
17.36 J/ ° C
2. How much heat is absorbed in the complete reaction of 3.00 grams of SiO2 with excess carbon in the reaction below? D H 0 for the reaction is +624.6 kJ.
SiO2(g) + 3C(s) ® SiC(s) + 2CO(g)
a.
366 kJ
b.
1.13 ´ 105 kJ
c.
5.06 kJ
d.
1.33 ´ 104 kJ
e.
31.2 kJ
3. How much heat is released when 75 g of octane is burned completely if the enthalpy of combustion is -5,500 kJ/mol C8H18?
C8H18 + 25/2 O2 ® 8CO2 + 9H2O
a.
7200 kJ
b.
8360 kJ
c.
4.1 ´ 105 kJ
d.
3600 kJ
e.
5500 kJ
4. The burning of 80.3 g of SiH4 at constant pressure gives off 3790 kJ of heat. Calculate D H for this reaction.
SiH4(g) + 2O2(g) ® SiO2(s) + 2H2O(l)
a.
-1520 kJ/molrxn
b.
– 47.2 kJ/molrxn
c.
– 4340 kJ/molrxn
d.
-2430 kJ/molrxn
e.
+ 4340 kJ/molrxn
5. Which of the following statements is incorrect?
a.
The thermochemical standard state of a substance is its most stable state under one atmosphere pressure and at some specific temperature (298 K if not specified)
b.
A superscript zero, such as D H 0 , indicates a specified temperature of 0 ° C.
c.
For a pure substance in the liquid or solid phase, the standard state is the pure liquid or solid.
d.
For a pure gas, the standard state is the gas at a pressure of one atmosphere.
e. For a substance in solution, the standard state refers to one-molar concentration.
6. For which of the following substances does = 0?
a.
CO2(g)
b.
H2O(g)
c.
Na(s)
d.
Br2(g)
e.
C(diamond)
7. Calculate the amount of heat released in the complete combustion of 8.17 grams of Al to form Al2O3(s) at 25 ° C and 1 atm. D H for Al2O3(s) = 1676 kJ/mol
4Al(s) + 3O2(g) ® 2Al2O3(s)
a.
254 kJ
b.
203 kJ
c.
127 kJ
d.
237 kJ
e. 101 kJ
8. Which of the following is not a formation reaction?
a.
1/2H2(g) + 1/2 Br2(l) ® HBr(g)
b.
H2(g) + 1/2O2(g) ® H2O(l)
c.
Ca(s) + 1/2O2(g) ® CaO(s)
d.
4Al(s) + 3/2O2(g) ® Al2O3(s)
e.
H2O(l) + SO3(l) ® H2SO4(l)
9. Given the standard heats of formation for the following compounds, calculate D H for the following reaction.
CH4(g)
+ H2O(g)
®
CH3OH(l)
+ H2(g)
D H (kJ/mol)
-75
-242
-238
0
a.
+79 kJ
b.
-79 kJ
c.
+594 kcal
d.
-594 kcal
e. – 405 kJ
10. Given the following at 25 ° C, calculate D H for HPO3(s) at 25 ° C.
P4O10(s) + 4HNO3(l) ® 4HPO3(s) + N2O5(s)
D H = -180.6 kJ
D H = -2984 kJ/mol for P4O10(s), -174.1 kJ/mol for HNO3(l), and – 43.1 kJ/mol for N2O5(s).
a.
-528.0 kJ/mol
b.
-1474 kJ/mol
c.
-948.5 kJ/mol
d.
+1474 kJ/mol
e. -954.5 kJ/mol
11. How much heat is released when 6.38 grams of Ag(s) reacts by the equation shown below at standard state conditions?
4Ag(s) + 2H2S(g) + O2(g) ® 2Ag2S(s) + 2H2O(l)
Substance
Ag(s)
0
H2S(g)
-20.6
O2(g)
0
Ag2S(s)
-32.6
H2O(l)
-285.8
a.
8.80 kJ
b.
69.9 kJ
c.
22.1 kJ
d.
90.8 kJ
e. 40.5 kJ
12. Which of the following techniques cannot be used to calculate D Hrxn?
a.
Calorimetry
b.
Using melting points of reactants and products
c.
Hess’s Law
d.
Using of Heats of Formation of reactants and products
e. Using bond energies of reactants and products
13. Evaluate D H 0 for the following reaction from the given bond energies.
2HBr(g) ® H2(g) + Br2(g)
D H H-H = 436 kJ/mol, D H Br-Br = 193 kJ/mol, D H H-Br = 366 kJ/mol
a.
-103 kJ
b.
-143 kJ
c.
+103 kJ
d.
+142 kJ
e. 259 kJ
14. A positive change in entropy represents:
a.
an increase in molecular disorder
b.
release of thermal energy
c.
a decrease in thermal energy
d.
a process that is always spontaneous
e. a process that cannot occur spontaneously
15. The second law of thermodynamics states:
a.
All exothermic processe s also increase entropy.
b.
The enthalpy of the universe always increases in spontaneous processes.
c.
A spontaneous process always increases entropy.
d.
D H <0 and D S >0 for all spontaneous processes
e. The entropy of the universe always increases in spontaneous processes.
16. What is the entropy change of the reaction below at 298 K and 1 atm pressure?
N2(g)
+ 3H2(g)
®
2NH3(g)
S (J/mol · K)
191.5
130.6
192.3
a.
-198.7 J/K
b.
76.32 J/K
c.
-129.7 J/K
d.
303.2 J/K
e. 384.7 J/K
17. The heat of vaporization of methanol, CH3OH, is 35.20 kJ/mol. Its boiling point is 64.6 ° C. What is the change in entropy for the vaporization of methanol?
a.
-17.0 J/mol•K
b.
3.25 J/mol•K
c.
17.0 J/mol•K
d.
104 J/mol•K
e. 543 J/mol•K
18. Which of the following statements regarding the third law of thermodynamics is incorrect ?
a.
The absolute S is zero at 0 Kelvin.
b.
The absolute S at 298 K can be positive or negative.
c.
Pure substances have positive absolute S at T > 0 Kelvin.
d.
Absolute zero gives a reference point for determining absolute S.
e. The absolute S is greater at 300 K than 100 K for a given substance.
19. Which of following would have the highest value of absolute entropy per mole?
a.
water at 50 ° C
b.
water at 10 ° C
c.
ice at -10 ° C
d.
1 MNaCl at 50 ° C
e. 1 MNaCl at 10 ° C
20. Based on the relationship of entropy to the degree of disorder in a system, which response includes all the following changes that represent an increase in entropy, and no others?
I.
the freezing of water
II.
the condensation of steam
III.
sublimation (vaporization) of dry ice, solid CO2
IV.
the extraction of salts and pure water from seawater
a.
I and IV
b.
II and IV
c.
I, and II
d.
III
e. I and III
21. Which response includes all the following processes that are accompanied by an increase in entropy, and only those processes?
I.
boiling water
II.
freezing water
III.
N2(g) + 3H2(g) ® 2NH3(g)
IV.
Br2(l) ® Br2(g)
a.
I and II
b.
III and IV
c.
I and IV
d.
II, III, and IV
e. another one or another combination
22. Which of the following changes represent a decrease in entropy?
a.
Precipitation of CaCO3 to form a seashell
b.
Evaporation of gasoline
c.
Decomposition of a dead animal
d.
Melting snow
e. Diffusion of perfume throughout a room.
23. Consider the conversion of a substance from solid to liquid.
Solid Liquid
At one atmosphere pressure and at the melting point of the substance, __________.
a.
D H = 0 for the process
b.
D S = 0 for the process
c.
D E = 0 for the process
d.
D G = 0 for the process
e. both D H = 0 and D E = 0 for the process
24. Evaluate D G 0 for the reaction below at 25 ° C.
2C2H2(g)
+ 5O2(g)
®
4CO2(g)
+ 2H2O(l)
D G (kJ/mol)
209.2
0
-394.4
-237.2
a.
-1409 kJ
b.
-2599 kJ
c.
-1643 kJ
d.
-2470 kJ
e. -766 kJ
51. Calculate D G 0 at 298 K for the reaction below.
Fe2O3(s)
+ 13CO(g)
®
2Fe(CO)5(g)
+ 3CO2(g)
D H (kJ/mol)
-824.2
-110.5
-733.8
-393.5
S 0 (J/mol•K)
87.4
197.6
445.2
213.6
a.
+63.6 kJ
b.
+26.8 kJ
c.
-243.1 kJ
d.
-52.2 kJ
e. -193.3 kJ
52. The standard molar enthalpy of formation of NO2(g) is 33.2 kJ/mol at 25 ° C and that of N2O4(g) is 9.16 kJ/mol. At 25 ° C their absolute entropies are 240.0 and 304.2 J/mol•K, respectively. Use the above data to calculate the standard Gibbs free energy change for the following reaction at 25 ° C. Express your answer in the form D G 0 = __________ kJ.
N2O4(g) ® 2NO2(g)
a.
4.1 kJ
b.
21.3 kJ
c.
4.8 kJ
d.
41.5 kJ
e. 11.4 kJ
53. For which set of values of D H and D S will a reaction be spontaneous (product-favored) at all temperatures?
a.
D H = +10 kJ, D S = -5 J/K
b.
D H = -10 kJ, D S = -5 J/K
c.
D H = -10 kJ, D S = +5 J/K
d.
D H = +10 kJ, D S = +5 J/K
e.
no such values exist
"Looking for a Similar Assignment? Order now and Get 10% Discount! Use Code "Newclient"
chemistry formulas
i need it to be ready within 3 hours from now plz
"Looking for a Similar Assignment? Order now and Get 10% Discount! Use Code "Newclient"
Chemistry (Q's 3)
1) A worker at DMG Energy, LLC experienced chest pain and was transported to the cardiac unit at a local hospital for treatment. During the doctor’s evaluation, the worker disclosed that he was on an ultra-low sodium diet. Explain why nutritionists often advise individuals on low-sodium diets to avoid cured fish and meat products. Contrast some properties between metallic nitrites and metallic nitrates.
Your response must be at least 200 words in length.
2) Ammonium nitrate is the most commercially important chemical product containing the ammonium ion. List and describe at least two grades of commercially available ammonium nitrate.Why does OSHA require employers to store bulk quantities of ammonium nitrate within a bin that is clean and free of contaminants? Give an example of a contaminant, and describe its interaction with ammonium nitrate.
Your total response must be at least 200 words in length.
3) Briefly share some common oxidizers that you might have in your home (e.g., under the counter, in the kitchen or bathroom, or out in the garage). Has your participation in this class made you decide to change your habits in storing or using any of these products? What have you done, or what do you plan to do?
"Looking for a Similar Assignment? Order now and Get 10% Discount! Use Code "Newclient"
According to the British King and bureaucracy, the colonists were acting like spoiled children. According to the colonists, the British were overbearing, over-taxing
According to the British King and bureaucracy, the colonists were acting like spoiled children. According to the colonists, the British were overbearing, over-taxing, and ignoring their grievances. Take the perspective of American colonists, and explain why the British colonies in North America revolted.
Below are some of the items to consider:The colonial relationship to the British before/after the French and Indian WarThe acts passed by the British governmentThe grievances stated in the Declaration of IndependenceThe events that escalated the division between the Crown and the Colonists.
"Looking for a Similar Assignment? Order now and Get 10% Discount! Use Code "Newclient"
We Acceppt
