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
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Reactions and Your Compound

The web resource Types of Chemical Reactions (link in prompt attachment) from last week’s module gave a graphical descriiption of the different types of reactions explored to this point. Think about the compound that you chose for Milestone One. Which of the five different types of reactions is your compound involved in? Include information about heats of reaction and comment on whether the reaction is endothermic or exothermic and how the magnitude of this energy change compares with other reactions. Post an example of a reaction and describe what type it is and why.
Chosen compound: Xanthan Gum

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)

element from the periodic table

Select an element from the periodic table (any element with the exception of Uranium). Prepare ONE page for your assigned element containing the following information:
• Stable Isotopes
• Melting and boiling points
• Atomic radius
• Electronegativity
• Density
• Reactivity
• Physical state at 298 K
• Classification (metal, nonmetal, metalloid)
• Reactivity & Applications
You can include any other interesting features of your element. You can see an example of the assignment here.
example attached

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
site: mycsu.columbiasouthern.edu.com

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: https://online.columbiasouthern.edu/bbcswebdav/pid-8184993-dt-content-rid-140658835_1/institution/CSEG_Content/Courses/CAS/CHM/CHM1301/21.01/Student/SupplementalContent/PhET%20Lab%20Files/acid-base-solutions_en.html

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?

Chromatography of Mycotoxins with Non-MS Detection

I have attached 9 references to this order and one example document. The example document is a reference to the style and form that the paper should be written, it is my publication from last year (2021 Chromatography of Mycotoxins with Non-MS Detection 1.1). All other attached 9 pdfs references are to be used in the paper. The main aim of the review is still to highlight advances in analytical methodology for the determination of mycotoxins, specifically the analysis of mycotoxins with HPLC or GC coupled with non-mass mass spectrometry detection. The review is not simply a list of new publications, it is a “curated” selection of no more than 9 papers that I as an expert found the most relevant to readers issues or concerns of interest to readers they can advance their own work.

Chromatography of Mycotoxins with Non-MS Detection

I have attached 9 references to this order and one example document. The example document is a reference to the style and form that the paper should be written, it is my publication from last year (2021 Chromatography of Mycotoxins with Non-MS Detection 1.1). All other attached 9 pdfs references are to be used in the paper. The main aim of the review is still to highlight advances in analytical methodology for the determination of mycotoxins, specifically the analysis of mycotoxins with HPLC or GC coupled with non-mass mass spectrometry detection. The review is not simply a list of new publications, it is a “curated” selection of no more than 9 papers that I as an expert found the most relevant to readers issues or concerns of interest to readers they can advance their own work.