Read the isntructions properly.
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Written Assignment 6: Gases
Answer all assigned questions and problems, and show all work.
1. A gas occupying a volume of 725 mL at a pressure of 0.970 atm is allowed to expand at constant temperature until its pressure reaches 0.541 atm. What is its final volume? (5 points)(Reference: Chang 5.19)
2. The volume of a gas is 5.80 L, measured at 1.00 atm. What is the pressure of the gas in mmHg if the volume is changed to 9.65 L? (The temperature remains constant.) (5 points)(Reference: Chang 5.21)
3. Why is the density of a gas much lower than that of a liquid or solid under atmospheric conditions? What units are normally used to express the density of gases? (5 points)(Reference: Chang 5.30)
4. A sample of nitrogen gas kept in a container of volume 2.3 L and at a temperature of 32°C exerts a pressure 4.7 atm. Calculate the number of moles of gas present. (8 points)(Reference: Chang 5.31)
5. What volume will 5.6 moles of sulfur hexafluoride (SF6) gas occupy if the temperature and pressure of the gas are 128°C and 9.4 atm? (8 points)(Reference: Chang 5.33)
6. A gas-filled balloon having a volume of 2.50 L at 1.2 atm and 25°C is allowed to rise to the stratosphere (about 30 km above the surface of Earth), where the temperature and pressure are –23°C and 3.00 × 10–3 atm, respectively. Calculate the final volume of the balloon. (8 points) (Reference: Chang 5.35)
7. A 2.10-L vessel contains 4.65 g of a gas at 1.00 atm and 27.0°C. (a) Calculate the density of the gas in grams per liter. (b) What is the molar mass of the gas? (10 points) (Reference: Chang 5.47)
8. A certain anesthetic contains 64.9 percent carbon, 13.5 percent hydrogen, and 21.6 percent oxygen by mass. At 120°C and 750 mmHg, 1.00 L of the gaseous compound weighs 6.90 g. What is the molecular formula of the compound? (10 points)
9. What is the mass of the solid NH4Cl formed when 73.0 g of NH3(g) are mixed with an equal mass of gaseous HCl? What is the volume and identity of the gas remaining, measured at 14.0°C and 752 mmHg? (8 points) (Reference: Chang 5.59)
10. A mixture of gases contains 0.31 mol CH4, 0.25 mol C2H6, and 0.29 mol C3H8. The total pressure is 1.50 atm. Calculate the partial pressures of the gases. (8 points) (Reference: Chang 5.67)
11. Propane (C3H8) burns in oxygen to produce carbon dioxide gas and water vapor. (a) Write a balanced equation for this reaction. (b) Calculate the number of liters of carbon dioxide measured at STP that could be produced from 7.45 g of propane. (10 points)(Reference: Chang 5.109)
12. A 10.0 g piece of pure aluminum is placed in 75.0 mL of 0.54 M hydrochloric acid at STP condition. They react as follows: 2Al + 6HCl → 3H2(g) + 2AlCl3 Calculate the following:
Evaluating science in the news
Learning outcomes
• Become aware of recent news stories involving biology.
• Be able to critically evaluate a news story in order to determine its scientific merits.
Find your news article
The purpose of this activity is to encourage you to pay attention to important biology news that you may encounter on TV, Radio, and the Internet. For this activity, you will be focusing only on the Internet as your news source. You can find many interesting and important biology headlines on the Internet, every day of the week. You are being asked to find one current news story within the field of biology that is hopefully of real interest to you.
If you are not sure where to begin, try going to some of the following online news sites:
• Science News Magazine
• Science Daily
• NPR science news
• Google science news
• Yahoo science news
Your article MUST be accessible via the Internet (you will give me the URL), MUST relate to biology (if it relates to living things in any way, it is ok; email your instructor if you are not sure), and MUST be current! The date of the article posting on the web must be no older than three days before the start of this class session (i.e. it cannot have posted more than three days before the availability for this discussion topic began). I want to see something that was posted on the web this week!
Questions
Answer the following questions in a computer document. Be sure to number your answers in the same format and order (#1-12) as listed below. Remember that your document must be in an acceptable format (e.g., .doc, .docx, .txt, .rtf, etc.; see syllabus for acceptable formats). After you have completed the entire activity, you will submit your answers in the assignment dropbox so that you can earn your points.
1. What is the title of your article? On what date (day/month/year) was it published online?
2. Why did you find this particular article interesting? In other words, what caught your attention, thus leading you to choose to share it?
3. In what way does your article relate to the field of biology? (Remember that your article must relate to biology)
4. What is the full URL of your web-based source? (copy the whole web address; I need to be able to visit your site)
5. In your own words, write a brief summary of what happened or was learned. In other words, what significant finding is being reported? (your answer must be at least five complete and meaningful sentences long, and MUST be in your own words; you will not get credit for sentences that you just copy/paste from the article!)
6. Who is the author of the research or the person(s) who made the discovery? Do you know whether or not they are from an educational institution, such as a university or college, or a state or government agency? If so, which one? Do you know anything about their credentials?
7. Is a scientific study presented? If so, has it been published in a scientific journal? Which one? Do they give you a link so that we may view the original journal article (primary source)?
8. What evidence is being presented to back up their findings? Any numbers and / or statistics given?
9. Do you trust their findings? Do the findings seem plausible?
10. Is this a positive or negative news source? In other words, is it a “good thing” or a “bad thing” being reported? Explain.
o If it is a good thing, explain how it could potentially add to your quality of life and / or that of others. Who benefits?
o If it is a bad thing, what if anything has been suggested to fix the situation or make things better? What is your opinion on what should be done?
11. Does what is being reported cause you any fear or distress? Explain.
12. Were you already aware of this news before reading the article, or was this something that you had not seen or heard of before?
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Attached Files:
ENG215_Appendix A_Peer Review Feedback Form 1.docx (98.832 KB)Students, please view the “Submit a Clickable Rubric Assignment” in the Student Center.
Instructors, training on how to grade is within the Instructor Center.
Peer Review Assignment
Due Week 4 and worth 50 points
Peer reviews should provide feedback to a peer on the criteria expected in the paper. The Week 4 Feedback Form can be downloaded from the Appendices section of the course guide by clicking the link here. Follow these instructions:
For Online Students:
For On-ground Students:
s paper from your professor.s paper as directed by your professor.Note: On-ground students should submit the feedback form and paper to the professor during the class meeting in which the paper is reviewed; online students should submit the feedback form and paper to the professor via the “Essay Drop off/Pick up Zone” discussion thread and Peer Review Assignment link in the course shell.
As you read a classmateâ€s paper, address these criteria:
The specific course learning outcomes associated with this assignment are:
Click here to view the grading rubric for this assignment.
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