chem U3 A

Before attempting the homework assignment, you are encouraged to view the Unit III Handout for additional help. The knowledge checks in the handout are designed to provide practice on math-heavy portions of your quizzes and homework assignments.
Solve the following problems, showing your work for all steps involved.
Write the balanced, nuclear equation for the positron emission from the Thallium-201 radioisotope.
What are the four common types of radioactive decay? Detail the differences between them. Include a detailed comparison, including penetrating power and energy. Include a balanced, nuclear equation with each as well.
What are the two types of nuclear reactions? Give an example of a balanced nuclear reaction for each type.
Use these questions as subheadings followed by your answers.
the unit 3 handout: copy and paste

Writer’s Choice

Written Assignment 6: Gases
Answer all assigned questions and problems, and show all work.
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)
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)
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)
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)

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)
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)
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)
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)
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)
NH3(g) + HCl(g) → NH4Cl

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)

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)

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:
Volume, in liters, of hydrogen gas. (5 points)
Molarity of Al+3. (Assume 75.0 mL solution.) (5 points)
Molarity of Cl–. (Assume 75.0 mL solution.) (5 points)

chem U2 A

Before attempting the homework assignment, you are encouraged to view the Unit I Handout for additional help. The knowledge checks in the handout are designed to provide practice on math-heavy portions of your quizzes and homework assignments. .
Which of the items below would be considered the densest? (Show your step-by-step work for calculating density of each, in the units of g/mL, to support of your final answer)
A piece of wood with a volume of 2.5 L and a mass of 12.5 kg
A ball with a volume of 139 mL and a mass of 93 g
A tire with a volume of 2.12 L and a mass of 4.22 x 104 mg
A wire with a volume of 3.91 x 10-7 L and a mass of 7.93 x 10-1 ng
A block of metal with a volume of 1350 mL and a mass of 1.29 x 103 g
Potassium has two naturally occurring isotopes. The masses (amu) and percent abundances of the two isotopes are given below. Show your work, and calculate the average atomic mass of the element in amu units.
Homework Table
Name the steps of the scientific method and apply them to an everyday problem you might solve using the method. Be detailed with your answer, and explain each step of your problem.
Submit your answers in a single Microsoft Word document. Be sure to cite and reference using APA guidelines when quoting or paraphrasing material. At a minimum, you should cite the textbook when answering question 3.
To see the textbook

chem U2 AT

1. The formula weight of magnesium hydroxide is __________ amu.
Include the chemical formula along with showing all work
2. How many milliliters of a 7.6 M NaOH solution are needed to prepare 0.915 L solution of NaOH with a concentration of 0.150 M?
Show your work, and include units throughout the solution.
3. What volume (mL) of 2.50 × 10-1 M hydrochloric acid can be neutralized with 105 mL of 0.300 M sodium hydroxide?
Include the balanced equation with your work.

chem U2 A

For this assignment, you will participate in an online simulation (see link below) and complete a worksheet based on your activity in the simulation by answering questions and including screenshots of your work. You must be logged into Blackboard to access the simulation.
copy link to browser:

chem U2 J

While much of the chemistry you will be learning about in this class has not changed during the last 20 or more years (with the exception of some added elements), there is new chemical research and news happening all around you. What innovations in chemistry interest you the most? How has or will this innovation impact your life or community?

. The American Chemical Society is a large organization to which a large number

The American Chemical Society is a large organization to which a large number (over 100,000) of professional chemists in the USA belong. The society publishes many scientific journals, holds scientific conferences and sends to all members a weekly news magazine: Chemical and Engineering News (Abbreviated C&EN). Each issue contains news articles and other items of interest to chemists and chemical engineers in industry, government, and the academic world. Your assignment is to read, from cover to cover, a recent issue of C&EN and write a brief essay based on your reading of the entire issue (specific things to include are below). Of course, a single issue is like a snapshot, only revealing a brief and incomplete view of the whole. Nevertheless, each issue covers a wide range of topics and you should be able to gain a reasonably good impression. You should read letters to the editor, news items, articles, book reviews, economic reports and advertisements. Nearly every issue will contain items to which you can connect.
The goal of your essay is to give your impression of what chemists are working on, interested in, and concerned about, and to relate chemistry to yourself. DO NOT merely paraphrase one article or list the articles. This assignment will give you an opportunity to exercise your writing skills on an unfamiliar subject and will be an instructive glimpse directly into the world of chemistry as it exists today.
Try to make as much sense of this material as you are able; don’t be concerned if some of the articles describing research are difficult to understand. Try to grasp what problem/topic the research is focused on and/or why it is important. Your essay should include at least the following:
A description of your attitudes toward chemistry prior to reading the magazine (and also prior to this course)
Find an item (article, news item, book review, advertisement, etc) that supports some aspect of your attitude about chemistry and describe the relationship. For this link to work, you must be signed into your UMemphis account, otherwise you will not have access to our library resources.
Find a different item that changed some aspect of your attitude about chemistry and describe the change.
Describe any common themes that appear throughout your issue and relate them to yourself in some way.
Describe your favorite item from the issue.
INSTRUCTIONS: Select an online issue of C&EN published in the last two years. The online issues of C&EN are accessible through the University of Memphis library website using the journal title search function.
DEADLINE – See the listing in the syllabus. If you need help with your writing, consult the Center for Writing and Communication (
STYLE – Feel free to express your own opinion and be creative. Imagine, for example, that this paper is a letter that you are sending home or to a friend to whom you are trying to explain what chemistry is all about. Try showing a draft to a classmate before you write and hand in the final draft. Make sure to cite the specific issue you selected by its publication date within your essay.
GRADING – The essay will be graded mostly on content but poor quality of the writing detracts from your meaning and that will affect your grade. Plagiarism is completely unacceptable and will be checked through, if you don’t understand something well enough to paraphrase it you need to discuss it with your instructor.
LENGTH and UPLOAD – Your essay should be 500-1000 words long (about 2-4 typed pages). You must upload your file to the dropbox in either Microsoft Work or PDF formats (which allow use of the plagiarism checking feature and addition of grading feedback directly within eCourseware). Check your document after upload to make sure it opens directly without having to be downloaded first. If your only option is to download the document before it can be opened, it has not been uploaded in an acceptable format.

Some chemical reactions go very fast, while others are very slow. For any reacti

Some chemical reactions go very fast, while others are very slow. For any reaction, the
rate is affected by changes in temperature, concentration of reactants, reactant
surface, and the addition of catalysts. Controlling the rate of reaction by changing
certain reaction conditions is essential for either slow down unwanted reactions or
accelerate chemical processes to increase productivity. Prepare a research paper
in MLA style (3 pages long without tables or figures, and consulting at least two
reliable sources)

Instructions Chemistry is involved in every facet of life and death. The funeral

Chemistry is involved in every facet of life and death. The funeral profession is ancient and has not undergone too many drastic changes since its creation. Many innovative companies are creating new ways in which individuals can celebrate their loved ones’ lives. There have been multiple resurrected and new disposition methods within the past several decades. They include:
Green burial
Open air cremation
Select one of the following disposition/memorialization methods to research and explain how the disposition/memorialization process relates to chemistry. Summarize how you would explain the process to a family.
Recompose (Links to an external site.)
Alkaline hydrolysis (Links to an external site.)
Green Burial (Links to an external site.)
Open Air Cremation (Links to an external site.)
Neptune Memorial Reef (Links to an external site.)
Elysium Space (Links to an external site.)
Life Gem (Links to an external site.)
Plastination (Links to an external site.)
Cryonics (Links to an external site.)
Information that is needed for the assignment:
1. A detailed explanation of the memorialization/disposition option.
2. A connection between the option you selected and chemistry.
3. A summary of how you would explain the memorialization/disposition option to a family who has no knowledge of the process.
4. Findings submitted via the options under the “Submission” section.
5. At least five references cited using APALinks to an external site. guidelines.
This assignment requires a file upload submission. Please submit your research in any of the following formats:
1. Word document
After you have reviewed the assignment instructions and rubric, as applicable, complete your submission by selecting the Submit Assignment button next to the assignment title. Browse for your file and remember to select the Submit Assignment button below the file to complete your submission. Review the confirmation annotation that presents after submission.