Science Papers Help Online

What is the pH of a buffer system that contains 0.24 M NH4+ and 0.12 M NH3? The pKa of NH4+ is 9.25.

Express your answer using two decimal places.

2. Titration of a 23.0 mL solution of KOH requires 13.0 mL of 0.0250 M H2SO4 solution.

What is the molarity of the KOH solution?

3. A solution is prepared by bubbling 20 L of HCl(g) at 36 ∘C and 1 atm into 300 mL of water.

Assuming all the HCl dissolves in the water, how many moles of HCl are in solution?

Express your answer using two significant figures and include the appropriate units.

4.What is the pH of the solution in 3?

Express your answer using two decimal places.

5.The active ingredient in aspirin is acetylsalicylic acid (MW=180.2g/mol). An aspirin tablet was dissolved in water and titrated with 0.100 MNaOH.

If the titration required 10.45 mL of NaOH to reach the phenolphthalein endpoint, how many milligrams of acetylsalicylic acid were in the tablet?

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The lens and mirror in figure are separated by 1 m and have a focal length of 81.4 cm and −56.5 cm, respectively.

a) If an object is placed 1 m to the left of the lens, locate the final image. The object is illuminated from the left, and the image is viewed from the left. Answer in units of cm.

b) Determine the overall magnification.

c) What is the nature of the image?

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Suppose you set yor textbook sliding across a gymnasium floor with a certain initial speed. it quickly stops moving because of a friction force exerted on it by the floor. Next, you start a backetball rolling with the same initial speed. it keeps rolling form one end of the gym to the other. why does the basketball roll so far? Does friction significanlty affect its motion?

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• Review Chapter 7 in The Future of Nursing: Leading Change, Advancing Health report provided in the Learning Resources. Focus on the information in Box 7.3, “Research Priorities for Transforming Nursing Leadership.”
• Select one of the research priorities listed in Box 7.3 that is of particular interest to you and applicable to your career interests. Consider the benefits and challenges of researching and addressing this priority in nursing.
• Using the Walden library, identify two to three current articles that address your selected research priority. Consider the current state of research efforts on this priority.
• Reflect on how the research findings for your area of priority impact nurses as leaders in organizations and health care reform. Why is research on this priority important?

Post a description of the priority you selected and the benefits and challenges of further researching this area. Provide an overview of the articles you found (using appropriate citations) relating to this priority, and highlight any key findings. Explain how continued research in this area could strengthen the ability of nurses to lead in both individual organizations and as advocates of health care reform.

Read a selection of your colleagues’ responses. Focus particularly on those questions raised to which you can add comments based on shared experiences or situations. Consider how your colleagues’ postings reflect and/or differ from your own perceptions and opinions. Review the Learning Resources for any clarification needed before responding.

Respond to at least two of your colleagues on two different days in one or more of the following ways:

• Ask a probing question, substantiated with additional background information, evidence, or research using an in-text citation.
• Share an insight from having read your colleagues’ postings, synthesizing the information to provide new perspectives.
• Offer and support an alternative perspective using readings from the classroom or from your own research in the Walden Library.
• Validate an idea with your own experience and additional research.
• Make a suggestion based on additional evidence drawn from readings or after synthesizing multiple postings.
• Expand on your colleagues’ postings by providing additional insights or contrasting perspectives based on readings and evidence.

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Local government leaders have asked you to provide information and recommendations for increasing sustainability in the community.  

Perform an initial search to learn about green initiatives for a city in your area.  

Create a 5- to 8-slide PowerPoint® presentation proposal to your local government.

Include the following:

• A summary of green initiatives for a city in your area.
• Recommendations to your local government for creating a greener, more sustainable and livable community.
• The proposal should include recommendations both for actions by the local government and by individual homeowners.
• Explain how implementing these recommendations would promote sustainability and improve like for residents.

Include appropriate images.

Include a list of the sources you use.

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John, a 66-year-old man, reports to his physician that he has had trouble urinating for the last several months, with narrowed stream and difficulty initiating urination. For the last 2 days. un- nation has become painful and produces only small amounts of urine. Urinalysis results are Within nor- mal limits. with the exception of the presence of bacteria on culturing. The following observations and lab tests are recorded in John’s chart: Digital rectal exam: enlarged prostate and pro- static nodule in one lobe Transrectal ultrasonography: abnormal mass present Urine culture: bacteria present Prostate-specific antigen: 12 ng/ ml What is the likely diagnosis? Why is it difficult for John to urinate?

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Glutathione is a tripeptide consisting of glutamic acid, cysteine, and glycine; it is abundant in human erythrocytes as well as in many types of tissue. Reduced glutathione (GSH) acts as a reducing agent in tissues because its side-chain –SH group can be readily oxidized to form disulfide bonds. Unless glutathione is maintained substantially in its reduced form as opposed to its oxidized form in erythrocytes, they lose their ability to transport oxygen effectively. Why do you think this is so?

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 What are your thoughts on departments such as pharmacy or insurance companies only having access on need to know information? What are your thoughts on an accidental breach such as a company getting the full medical record of the patient? How can this be prevented?

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We are doing the Grignard Reaction Lab and there is a couple of questions about the lab that i need help with.why should all of the glassware and the magnesium used for the preparation of the Grignard reagent be dry?

why should all of the glassware and the magnesium used for the preparation of the Grignardreagent be dry.The Grignard reagent is a strong base and a strong nucleophile. As a base, it will react…

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SUGGESTED EXPERIMENTS TO TEST YOUR HYPOTHESES AND ANSWER THE QUESTION (Your objectives. Give bullet point suggestions, name key techniques and reagents (e.g. name specific, appropriate agars or molecular analyses) for the question : What is the carriage rate of Staphylococcus aureus (MSSA/MRSA) in the University population?

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