Description
If a chemist experimentally determined the percent carbon in C3H8 to be 79.43 %, what was his % error (to 0.01 %)? (Hint - you already know how to determine the theoretical % C in C3H8.)
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Explanation & Answer
Molar mass of C3H8 is 44.0956 g/mol
%of carbon=36/44.0956*100%=81.641%
percentage error=81.641-79.43
=2.211%
percentage error=2.211%/79.43*100%
2.784%
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Case histories for five individuals who jumped or fell to their death at a mall in Syracuse adapted from records from the Onondaga County Health Department, 1998-2002CaseSceneCause of DeathPast History45 yo femaleJumped from 3rdfloorMultiple injuries due to fall from heightHistory of psychiatric problems including bipolar disorder and prior suicide attempts, was under treatment at the time of deathMarital problems17 yo maleJumped from 3rdfloorWas impaired by drugs at time of deathLanded on a table on the basement level where a 10-12 yo boy was eating. 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The results are as follows: Condition* Present Absent*as established by the diagnostic interviewQuestions:Calculate the sensitivity, specificity, positive and negative predictive value of this screening test.Sensitivity: ________ Specificity: ________Positive Predictive Value: ________Negative Predictive Value: ________List the possible problems associated with this type of screening procedure in the school setting. Are there methods to overcome these limitations?The current cost of this screening procedure is $20 per student screened (Step 1). For students who have a positive screening test, an additional cost of approximately $75 per student is incurred for the diagnostic interview with a mental health professional (Step 2). Refer to the information below for the number of middle and high schools in Onondaga County and their respective enrollment.SCHOOL AND STUDENT POPULATION INFORMATION*Onondaga County, New York, 2000–2001 Academic YearTotal number of High Schools: 20Total High School Population (Grades 9-12): 24,982Range of school size: 292- 2,900 studentsTotal number of Middle Schools 24Total Middle School Population: 19,946Range of school size: 58- 1,690 students:*Data Source: Onondaga County Madison (OCM) Boces, NYS Department of EducationWill you advise the local school board to adopt this screening method as a preventive intervention to reduce adolescent suicide in the entire middle and high school population in Onondaga County? (List the considerations in making this decision.)Do you advise applying this screening procedure in pilot or demonstration schools? An important component in developing a sustainable screening program is determining the effectiveness of the program. An effective screening program should significantly reduce adverse outcomes such as morbidity and mortality in the at-risk population. How would you proceed to evaluate the effectiveness of this suicide screening method? With whom would you collaborate?Describe the study intervention that you would test (specifics of screening program).What outcomes would you select to measure?What types of study designs are most commonly used to determine the effectiveness of screening interventions?Frequent concerns facing researchers in the process of designing a study include statistical power and selection bias. How would you address these in your study?Taking all of the above factors into account, what study design would you select to evaluate the effectiveness of a newly adopted screening method to decrease the risk of adolescent suicide in your middle and high school population?References:U.S. Department of Health and Human Services. Mental Health: A Report of the Surgeon General. Rockville, MD. U.S. Department of Health and Human Services, Substance Abuse and Mental Health Services Administration, Center for Mental Health Services, National Institutes of Health, National Institute of Mental Health, 1999.Screening for Depression. Recommendations and Rationale. May 2002. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/clinic/3rduspstf/depression/de... Shaffer D, Craft L. Methods of Adolescent Suicide Prevention. J Clin Psych; 1999: 60:70-74.Data Source: TeenWatch, the Adolescent Suicide Surveillance Project in Onondaga Co, NY Figure 4: Emergency Department Visits for Suicide Attempts or Suicidal Ideation, by Gender 12/98- 12/99 (n=266)Data Source: TeenWatch, the Adolescent Suicide Surveillance Project in Onondaga Co, NY Figure 5: Reported Visits for Suicide Attempts and Ideation by Drug and Alcohol Use, 12/1/98 - 12/31/99 Data Source: TeenWatch, the Adolescent Suicide Surveillance Project in Onondaga Co, NYData Source for both figures TeenWatch, the Adolescent Suicide Surveillance Project in Onondaga Co, NYData Source: TeenWatch, the Adolescent Suicide Surveillance Project in Onondaga Co, NY Data Source: TeenWatch, the Adolescent Suicide Surveillance Project in Onondaga Co, N Y
San Diego State University Classification of Xenacoelomorpha Species Discussion
Please, read this paper in great detail. submit 3-5 pre-discussion questions or statements and 3-5 post-discussion stateme ...
San Diego State University Classification of Xenacoelomorpha Species Discussion
Please, read this paper in great detail. submit 3-5 pre-discussion questions or statements and 3-5 post-discussion statements and questions.
Unit VIII Thermodynamic Concepts and Their Applications
STUDY GUIDE AND SAMPLE PROBLEMS ATTACHED. USE ATTACHED TEMPLATE This assignment will allow you to demonstrate the followin ...
Unit VIII Thermodynamic Concepts and Their Applications
STUDY GUIDE AND SAMPLE PROBLEMS ATTACHED. USE ATTACHED TEMPLATE This assignment will allow you to demonstrate the following objectives:Describe thermodynamic concepts and their applications.Extend the first law of thermodynamics to various daily life activities.Identify the maximum efficiency of a heat engine. Explain the role of latent heat while phases are changing.Instructions: Choose 8 of the 10 problems below. Show your work in detail. Answer the questions directly in this template. Before doing this, it is highly recommending that you thoroughly review the four examples in the Unit Lesson.The efficiency of a Carnot engine is e=1-Tc/TH, where Tc is a temperature of the cold reservoir and TH is a temperature of the hot reservoir. What is the condition to have 100% efficiency? Hint: What is the mathematical condition for Tc/TH to be zero.Suppose the work done to compress a gas is 100 J. If 70 J of heat is lost in the process, what is the change in the internal energy of the gas? Hint: Use the first law of thermodynamics. The internal energy of a system changes due to heat (Q) and work (W): U=Q-W.The change in internal energy is equivalent to the difference between the heat added to the system and the work done by the system. Think if the work done is to the system or by the system. This determines the sign of W. An engine’s fuel is heated to 2,000 K and the surrounding air is 300 K. Calculate the ideal efficiency of the engine. Hint: The efficiency (e) of a Carnot engine is defined as the ratio of the work (W) done by the engine to the input heat QH : e=W/QH. W=QH – QC, where Qc is the output heat. That is, e=1-Qc/QH =1-Tc/TH, where Tc for a temperature of the cold reservoir and TH for a temperature of the hot reservoir. The unit of temperature must be in Kelvin.Mr. White claims that he invented a heat engine with a maximum efficiency of 90%. He measured the temperature of the hot reservoir as 100o C and that of cold reservoir as 10o C. Find the error that he made and calculate the correct efficiency. Hint: The efficiency (e) of a Carnot engine is defined as the ratio of the work (W) done by the engine to the input heat QH : e=W/QH. W=QH – QC, where Qc is the output heat. That is, e=1-Qc/QH =1-Tc/TH, where Tc for a temperature of the cold reservoir and TH for a temperature of the hot reservoir. The unit of temperature must be in Kelvin.How much energy is needed to change 100 g of 0o C ice to 0o C water? The latent heat of fusion for water L=335,000 J/kg. Hint: The heat (Q) used to change from one phase to another phase of the matter is Q=mL, where L is the latent heat. Its unit is J/kg.It was determined in the 19th century that the normal human body temperature is 98.6o F. A more recent study found that it is 98.2o F. Express the difference in the temperature in Celsius. Hint: Use the converting formulabetween Fahrenheit and Celsius scales:F=9/5C +32. Be careful about the unit. Suppose 0.5 kg of blood flows from the interior to the surface of John’s body while he is exercising. The released energy is 2,000 J. The specific heat capacity of blood is 4,186 J/kgo C. What is the temperature difference between when the blood arrives at the body surface and returns back to the interior of the body? Hint:Use the formula regarding heat Q, specific heat capacity c, mass m, and temperature change dT.Q= cm dT. Please look at p.290 in our textbook. Also, review Example 1 with its solution in Study Guide. A student does 1,000 J of work when she moves to her dormitory. Her internal energy is decreased by 3,000 J. Determine the heat during this process. Does she gain or lose her heat? Hint: Use the first law of thermodynamics. The internal energy of a system changes due to heat Q and work done W: U=Q-W.Also, look at a similar case, Example 3 with its solution in Study Guide.In a construction site, 2 kg of aluminum shows the increment of temperature by 5oC. Ignoring the work, what is the change in the internal energy of the material? The specific heat capacity of aluminum is 900 J/kg oC. Hint: The internal energy of a system changes due to heat Q and work done W: U=Q-W.If we ignore, the work, the internal energy U is identical to the heat Q of the system. We know that relation between heat Q, specific heat capacity c, mass m, and temperature change dT; Q= cm dT. That is, U=Q=cm dT.The input heat of a Carnot engine is 3,000 J. The temperature of a hot reservoir is 600 K and that of a cold reservoir is 300 K. What is the work done? Hint: The efficiency e of a Carnot engine is defined as the ratio of the work done, W,by the engine to the input heat QH : e=W/QH. W=QH – QC, where Qc is the output heat. That is, e=1-Qc/QH =1-Tc/TH, where Tc for a temperature of the cold reservoir and TH for a temperature of the hot reservoir. The unit of temperature must be in Kelvin.Use the formula, e=1-Tc/TH.Please review the Example 4 with its solution in Study Guide. Once you evaluate, you can find the work done of the system using the formula, e=W/QH
“The Americas: North, Middle, and South” and “Subsaharan Africa and North Africa/Southwest Asia”
“The Americas: North, Middle, and South” and “Subsaharan Africa and North Africa/Southwest Asia”Reminder: For your ...
“The Americas: North, Middle, and South” and “Subsaharan Africa and North Africa/Southwest Asia”
“The Americas: North, Middle, and South” and “Subsaharan Africa and North Africa/Southwest Asia”Reminder: For your Course Project, imagine that you are developing a global travel film. In this scenario, you are a researcher on the script writing team, traveling with the location scouts.This week you will complete Sections 2 and 3 of your Course Project. Section 2 will cover The Americas (North, Middle, and South). Section 3 will cover the realms of Subsaharan Africa and North Africa/Southwest Asia.Each section of your Course Project will have a special theme. The theme for Section 2 is the impact of the environment (e.g., deforestation or climate change). The theme for Section 3 is the influence of oil. To prepare:Review Chapters 1-3 on the Americas in The World Today.Read Chapter 6 on Subsaharan Africa and North Africa/Southwest Asia in The World Today.Consider how changes in the environment have influenced the Americas (e.g., deforestation or climate change).Review pages 207-213 from your course text regarding the discovery of oil and its impact on the Southwest Asian region.Consider how oil has influenced parts of Subsaharan Africa and North Africa as well.Your recommendations to the script writing team need to include the following:Locations to film and highlight that illustrate the special themes for the week:The Americas (North, Middle, and South): Impact of the environment (e.g., deforestation or climate change).Subsaharan Africa and North Africa/Southwest Asia: Influence of oilFor each realm, pick at least one specific location that illustrates the special theme for each section. Write up your recommendations for the script writing team, sharing specific reasons why each location is interesting, compelling, or important. Be sure to relate each location to the special themes for the week.For each realm, include a map that clearly identifies each of your locations. You may want to use color coding or a legend. Google Maps has several helpful editing tools that you can use to create your maps and identify your locations. For each realm, include at least two representative screen shots from Google Street View that relate to each of your chosen locations. If Street View images aren’t available, find some other visual images. For quick tips on how to create screen shots, see the document Creating Screen Shots in the Week 1 Resources area.Your completed Assignment should be 4–6 pages (Section 2: The Americas—2–3 pages; Section 3: Subsaharan Africa and North Africa/Southwest Asia—2–3 pages). Each section should include a map and 2 or more images (not included in page estimate).
Northern Virginia Community College Pediculus Humanus Capitis Discussion
Please click on "One Species At A Time Podcast (????????)."
Pick and listen to a podcast of a topic of your interest. Each ...
Northern Virginia Community College Pediculus Humanus Capitis Discussion
Please click on "One Species At A Time Podcast (????????)."
Pick and listen to a podcast of a topic of your interest. Each podcast will last about 5 minutes and you can download the transcript.
Please look up more information about the main organism discussed in the podcast and write a report about the organism. Include the scientific name(s) of the organism(s). If there are more than one organism described, please choose only one, but summarize the podcast briefly.Your primary report should address the following points:
Brief summary of podcast
Full scientific and common name of the organism.
Classification of the organism including species, genus, family, order, class, phylum, kingdom and domain.
Overview of physical and physiological characteristics
200 words or longer and a reference (APA format (????????)).
Part II - Discussion Participation
Write a response to at least two other students, commenting on their report and asking a question about the report, including questions about the scientists who performed the research and the organisms under discussion. Please make sure to answer all questions in reply to your report in detail.
geographic essay
Write a one page essay about what you know about the "greenhouse effect" using your textbook (pages 39-45) and other resou ...
geographic essay
Write a one page essay about what you know about the "greenhouse effect" using your textbook (pages 39-45) and other resources (cite any external resources), be sure to talk about what it is, how it works, what gasses are involved, what it contributes to, etc. (You must answer these questions). In addition, watch the video on Greenhouse gases below. After watching the video be sure to answer these questions as well. What do the scientist remark about vegetation and greenhouse gases? Based on this, what ideas can you come up with to help solve the problem of greenhouses gases. This assignment should be 3/4 to 1 page in length and must be written using full sentences and complete paragraphs. Point form is not permitted.http://video.nationalgeographic.com/video/greenhou...
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