A vapour at 22 atm and 5 °C was allowed to expand adiabatically to a final pressure of 1.00 atm; the temperature fell by 10 K. Calculate the Joule-Thomson coefficient, µ, at 5 °C, assuming it remains constant over the temperature range.
22. Metabolic acidosis. As we will see later in the course, patho-logical conditions arise when the blood pH falls because of excess acid production, a condition called metabolic acidosis. Excess protons in the blood decrease the amount of HCO3 and thus reduce the buffering capacity of blood. A rapid drop in pH could lead to death. Normal values for blood are pH = 7.4, [HCO3 = 24.0 mM, [CO2] = 1.2 mM. (a) If a patient has a blood pH = 7.03 and [CO2] = 1.2 mM, what is the [HCO3] in the patient’s blood? The pKa of HCO3 = 6.1. (b) Suggest a possible treatment for metabolic acidosis. (c) Why might the suggestion for part (b) be of benefit to middle-distance runners?
Ethers can often be prepared by SN2 reaction of alkoxide ion with alkyl halides. Suppose you want to prepare cyclohexyl methyl ether and cyclohexyl pentyl ether. Which possible route would you choose? Explain also give its mechanism?
It is now two years since the Grenfell Tower fire, the deadliest structural fire in the UK since Piper Alpha in 1988. Similar tall building fires occurred at the Lacrosse Apartments in Melbourne (2014) and Torch Tower in Dubai (2017) but with less tragic outcomes. All three fires had similar causes – the rapid spread of initially small fires. In her report published a year on from Grenfell Tower, Dame Judith Hackitt commented that the construction industry ‘has not reflected and learned for itself, nor looked to other sectors’ (Hackitt, 2018, p.5). Tragic incidents such as Grenfell Tower invariably trigger reforms in legislation and regulation.
a) Critically discuss the notion that large scale construction and building management has outgrown current regulation.
b) Assess the extent to which the construction industry can learn from and apply the lessons learned in other high risk industry sectors.
A compound has the empirical formula C2H3O2.Its vapour density is 59.its molecular formula will be?A compound has the empirical formula C2H3O2.Its vapour density is 59.its molecular formula will be?
Some nitrogen and hydrogen gases are pumped into an empty 5 litre bulb at 500°c.When equilibrium is established 3moles of nitrogen,2.10moles of hydrogen and 0.298 moles of NH3 are found present .find the value of Kc for the reaction
In order to achieve a high level of cornprehension, ensure that you questi scientist, you should think critically about all the stages in the experiment it, what reaction is now occurring, why do we see a change in the sample, i
Qi. Complete the following flowchart as you work through this laboratl (6 marks)
Question 3: Electrochemical Cell (1 6 points)
A high school girl was ready for her big date but discovered with horror that her silver necklace was all tarnished. Having just studied about redox reactions and electrochemical cells in chemistry class, she grabbed some aluminum foil, put it in a dish, and placed her necklace on top
of the foil. Then she added some baking soda, a little salt, and hot water. Within a few minutes, her
necklace was bright and shiny again.
The formula for tarnished silver is Ag2S. Use the equation below to answer the following questions.
Ag2S+ Al (s) w AI2S3+ Ag(s) (unbalanced)
a. Balance the equation with coefficients.
(1 point)
b. What makes this an oxidation-reduction reaction? (1 point)
c. Write the half-reactions showing the oxidation and reduction reactions. Identify which is the
oxidation reaction and which is the reduction reaction.
(2 points)d. What is oxidized in the reaction? What is reduced? (2 points)
e. In this simple electrochemical cell, what functions as the anode? What is the cathode? (2
points)
f. Why does the necklace need to touch the aluminum foil? (1 point)
g. What part of an “electrochemical cell” is the baking soda, salt, and water mixture? (1 point)
h. Is this a galvanic cell or electrolytic cell? Explain your answer. (2 points)i. Write the standard cell notation for an electrochemical cell consisting of an anode and cathode of the same types as in this experiment, connected through a salt bridge. (2 points)
j. What would the overall potential for this cell be?(2 points)
Finding the structures of new molecules and/or confirming the structures of synthesized molecules is central to organic chemistry. Mass spectrometry and infrared spectrometry are two important techniques to help with characterizing a molecule. Discuss these two techniques and the specific chemical information they provide.
heat is transferred to a system. will the internal energy increase more if the system is at constant volume or at constant pressure? Explain
Sucrose, C12H22O11, reacts slowly with water in the presence of an acid to form two other sugars, glucose and fructose, both of which have the same molecular formulas, but different structures.
C12H22O11 + H2O ? C6H12O6 (glucose) + C6H12O6 (fructose)
The reaction is first order and has a rate constant of 6.2 × 10-5/s at 35°C when the H+ concentration is 0.10 M. Suppose that the initial concentration of sucrose in the solution is 0.40 M. What will the sucrose concentration be after 2.0 hours?
Retrosynthesis is a method of chemical synthesis which involves “deconstructing” a target molecule into its readily available, simple starting materials in order to assess the best synthetic route. Research (the internet) and pick a molecule of interest to you, then work backwards to provide appropriate starting materials. Present your findings in this discussion. Comment on other student’s presentations.
what is the purpose of chemical material process such as sulphuric acid and nitric acids production.what are the trouble shooting of nitric acids and sulphuric acidswhat is the chemistry of nitric acids and sulphuric acids
A lactic acid/lactate ion buffer solution contains 0.40 M HC3H5O3 and 0.88 M C3H5O3-, respectively. The Ka value of lactic acid is 1.4×10-4. Calculate the pH of this buffer.
Alkenes provide rich opportunities for chemical reactions. Please discuss the different varieties of reactions. Provide specific chemical examples along with your discussions.
Subject: Public Health
Topic:
knowledge regarding Modern and traditional Therapy of Typhoid In Developing countries (3000 words)
Instructions:
The literature review must contain key references/theorists/researchers for the public health topic chosen. The literature review assignment must be designed to address the following questions:
- Who are the key theorists/researchers in your public health topic?
· What are the key issues?
· What are the gaps in the existing body of knowledge?
The literature review should provide a basis for justifying a clear research question or hypothesis to be explored further.
You must also indicate the search strategy used for your literature review. For example, what were the key words you searched for, and which key databases or other sources did you use to conduct your literature review? (e.g. CINAHL, Proquest Public Health, Informit, Medline, Google Scholar).
o Provides a lucid introduction
o Shows a sophisticated understanding of the key issues
o Shows ability to interpret relevant information and literature in relation to chosen topic
o Demonstrates a capacity to explain and apply relevant concepts
o Shows evidence of reading beyond the required readings
o Justifies any conclusions reached with well-formed arguments and not merely assertions
o Provides a conclusion or summary
o Correctly uses academic writing, presentation and grammar:
Complies with academic standards of legibility, referencing and
§ bibliographical details (including reference list) Writes clearly, with accurate spelling and grammar as well as proper
§ sentence and paragraph construction Uses appropriate APA style for citing and referencing research
Why carbocations rearrange themselves to form more stable carbocation? How the carbocations rearrange themselves? whatis hydride or alkyl shift and ring contraction and ring expansion?
b) Determine the fugacity of n-butane gas at 500 K and 50 bar using the equation derived in a). c) Determine the fugacity of n-butane gas at 500 K and 50 bar using the values of HR = -4.51 kJ/mol and SR = -6.55 J/mol-K determined in Example 6.4 for n-butane under these conditions (pp 215-216 in SVN&A). d) Determine the fugacity of n-butane gas at 500 K and 50 bar using generalized correlations.
Question 27 The heat of mixing data for the n-octanol + n-decane liquid mixture at atmospheric pressure are approximately fit by H = x1x2(A + B(x1 – x2)) J/mol Where A = -12,974 + 51.505 T and B = +8782.8 - 34.129 T with T in K and x1 being the n-octanol mole fraction. a) Compute the difference between the partial molar and pure component enthalpies of n-octanol and n-decane at x1 = 0.5 and T = 300 K. b) Compute the difference between the partial molar and pure component heat capacities of noctanol and n-decane at x1 = 0.5 and T = 300 K. c) An x1 = 0.2 solution and an x1 = 0.9 solution are to flow continuously into an isothermal mixer in a mole ratio of 2:1 at 300 K. Will heat have to be added or removed to keep the temperature of the solution leaving the mixer at 300 K? What will be the heat flow per mole of solution leaving the mixer? d) Plot H vs. x1 at 300 K. Show the relationship between the plotted data and your answers in part a) by placing your value for n-octanol at x1 = 1.0 and your value for n-decane at x1 = 0.0. e) Using the plot, estimate values for H18 and H2 8.