First estimation of atomic mass based on PhET simulation average mass of chlorine listed in the...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
First estimation of atomic mass based on PhET simulation average mass of chlorine listed in the periodic table: number of chlorine-35 atoms: number of chlorine-37 atoms: weighted average calculated in simulation (rounded to three decimal places): Question 6. (1 point) Second estimation of atomic mass based on PhET simulation number of chlorine 35 atoms: number of chlorine-37 atoms: weighted average calculated in simulation (rounded to three decimal places): F. Use the following PhET lab simulation https://phet.colorado.edu/sims/html/isotopes-and-atomic-mass/latest/isotopes-and-atomic-mass en.html Select the Mixtures tab at the bottom. Select Cl from the periodic table. Two stable isotopes are listed, chlorine-35 and chlorine- 37. Expand the Percent Composition and Average Atomic Mass windows, and select "My Mix" in the lower right. Click/drag one atom of each isotope into the black area. This represents a 50:50 mixture, 50% of each isotope, for a normal average (equal weights) of 35.96738 amu. Your window should look like the image shown on the right. Chierine-3 solopes and Atomic Mass Chlorine-37 24Mg CNOF Percent Composition = 23.98504 amu Average Atomic Mass Isotope Mu My Mix ON M Question 5. (1 point) Using the individual balls, can you add enough of each isotope to get close to the average mass listed in the periodic table? How close can you get? List your results on the Lab Report sheet. PHET Question 6. (1 point) Beneath the black box on the right, select the slider icon. Use this to adjust the number of atoms of each isotope from 0-100. Now how close can you get the weighted average mass to match what is listed in the periodic table? List your results on the Lab Report sheet. Question 7. (1 point) Now click on 'nature's mix', and compare your answers. "Nature's mix" is the actual measured fractions of the listed isotopes that are found in nature. The mass of chlorine-35 is 34.96885 amu, and the mass of chlorine-37 is 36.96590 amu. Using these amounts, calculate the weighted average of chlorine found in nature. (Clearly show all work, and report your answer to three decimal places). Question 8. (1 point) Now perform this calculation for magnesium. Note there are three stable isotopes for magnesium; the atomic masses are listed below using the nuclide symbols. (Clearly show all work, and report your answer to three decimal places). 25 Mg = 24.98584 amu 26Mg = 25.98259 amu 715 53.75 * 162.75 E. What is found in nature. Since most radioactive isotopes decay in a matter of seconds or less, most of what we find in nature is comprised of stable isotopes. You have just been exploring the percentages of the stable isotopes of carbon. The periodic table lists the mass of carbon in nature as 12.01 amu. This represents the average mass considering the amounts of carbon-12 and carbon-13 in nature. Usually, people think of an average as sum of the individual values divided by the number of values. This is valid when the things you're measuring are present in equal proportions, or when you're measuring the same quantity multiple times. That is, each value carries the same weight, or impact (not weight as in the product of mass and gravity!). For example, when you're measuring three values, each with equal weight (impact) on the result, you would typically use the following calculation: A+B+C 3 Rearranging, this is exactly the same as: A(0.33) + B(0.33) + C(0.33) The individual carbon isotopes are NOT present in equal amounts. But the calculation is the same, except that now the fractions (weight, or impact) of each isotope in the measurement is different: (mass carbon 12)(fraction) + (mass carbon-13)(fraction) Using the values you found in Part D, the average mass calculation becomes: (12.00000 amu)(0.9893) + (13.00335 amu)(0.0107) = 12.01 amu This is called a weighted averago, where "weight" refers to the fraction of each quantity being measured. The general formula looks like this: (A)(fraction of A) + (B)(fraction of B) + (C)(fraction of C) ... + (n)(fraction of n) Question 4. (1 point) Imagine you've identified a new element, let's call it X that has two stable isotopes, 215x present at 25%, and 217X present at 75%. What would be the approximate atomic mass found in nature? Show your work and/or explain your reasoning. Questions are answered on the Lab Report associated with this document. First estimation of atomic mass based on PhET simulation average mass of chlorine listed in the periodic table: number of chlorine-35 atoms: number of chlorine-37 atoms: weighted average calculated in simulation (rounded to three decimal places): Question 6. (1 point) Second estimation of atomic mass based on PhET simulation number of chlorine 35 atoms: number of chlorine-37 atoms: weighted average calculated in simulation (rounded to three decimal places): F. Use the following PhET lab simulation https://phet.colorado.edu/sims/html/isotopes-and-atomic-mass/latest/isotopes-and-atomic-mass en.html Select the Mixtures tab at the bottom. Select Cl from the periodic table. Two stable isotopes are listed, chlorine-35 and chlorine- 37. Expand the Percent Composition and Average Atomic Mass windows, and select "My Mix" in the lower right. Click/drag one atom of each isotope into the black area. This represents a 50:50 mixture, 50% of each isotope, for a normal average (equal weights) of 35.96738 amu. Your window should look like the image shown on the right. Chierine-3 solopes and Atomic Mass Chlorine-37 24Mg CNOF Percent Composition = 23.98504 amu Average Atomic Mass Isotope Mu My Mix ON M Question 5. (1 point) Using the individual balls, can you add enough of each isotope to get close to the average mass listed in the periodic table? How close can you get? List your results on the Lab Report sheet. PHET Question 6. (1 point) Beneath the black box on the right, select the slider icon. Use this to adjust the number of atoms of each isotope from 0-100. Now how close can you get the weighted average mass to match what is listed in the periodic table? List your results on the Lab Report sheet. Question 7. (1 point) Now click on 'nature's mix', and compare your answers. "Nature's mix" is the actual measured fractions of the listed isotopes that are found in nature. The mass of chlorine-35 is 34.96885 amu, and the mass of chlorine-37 is 36.96590 amu. Using these amounts, calculate the weighted average of chlorine found in nature. (Clearly show all work, and report your answer to three decimal places). Question 8. (1 point) Now perform this calculation for magnesium. Note there are three stable isotopes for magnesium; the atomic masses are listed below using the nuclide symbols. (Clearly show all work, and report your answer to three decimal places). 25 Mg = 24.98584 amu 26Mg = 25.98259 amu 715 53.75 * 162.75 E. What is found in nature. Since most radioactive isotopes decay in a matter of seconds or less, most of what we find in nature is comprised of stable isotopes. You have just been exploring the percentages of the stable isotopes of carbon. The periodic table lists the mass of carbon in nature as 12.01 amu. This represents the average mass considering the amounts of carbon-12 and carbon-13 in nature. Usually, people think of an average as sum of the individual values divided by the number of values. This is valid when the things you're measuring are present in equal proportions, or when you're measuring the same quantity multiple times. That is, each value carries the same weight, or impact (not weight as in the product of mass and gravity!). For example, when you're measuring three values, each with equal weight (impact) on the result, you would typically use the following calculation: A+B+C 3 Rearranging, this is exactly the same as: A(0.33) + B(0.33) + C(0.33) The individual carbon isotopes are NOT present in equal amounts. But the calculation is the same, except that now the fractions (weight, or impact) of each isotope in the measurement is different: (mass carbon 12)(fraction) + (mass carbon-13)(fraction) Using the values you found in Part D, the average mass calculation becomes: (12.00000 amu)(0.9893) + (13.00335 amu)(0.0107) = 12.01 amu This is called a weighted averago, where "weight" refers to the fraction of each quantity being measured. The general formula looks like this: (A)(fraction of A) + (B)(fraction of B) + (C)(fraction of C) ... + (n)(fraction of n) Question 4. (1 point) Imagine you've identified a new element, let's call it X that has two stable isotopes, 215x present at 25%, and 217X present at 75%. What would be the approximate atomic mass found in nature? Show your work and/or explain your reasoning. Questions are answered on the Lab Report associated with this document.
Expert Answer:
Related Book For
Conceptual Physical Science
ISBN: 978-0134060491
6th edition
Authors: Paul G. Hewitt, John A. Suchocki, Leslie A. Hewitt
Posted Date:
Students also viewed these chemistry questions
-
To what group in the periodic table would an element with atomic number 114 belong?
-
The atomic mass of boron (B) is given in the periodic table as 10.81, yet no single atom of boron has a mass of 10.81 u. Explain.
-
To what group in the periodic table would an element with atomic number 114 belong?
-
Show the parse trees for the two parses that the grammar assigns for sentence S1. S1: the train station bus rumbles [3 marks] (b) Give an algorithm for a bottom-up passive chart parser without...
-
What are the key concepts that underlie the construction and interpretation of control charts?
-
a. Create a data flow diagram of the current system. b. Create a system flowchart of the existing system. c. Analyze the internal control weaknesses in the system. Model your response according to...
-
In the California Daily 4 lottery, four digits between 0 and 9 inclusive are randomly selected each day. We normally expect that each of the ten different digits will occur about 1/10 of the time,...
-
Sven's Cookhouse is a popular restaurant located on Lake Union in Seattle. The owner of the restaurant has been trying to better understand costs at the restaurant and has hired a student intern to...
-
In terms of the demand-supply model for an individual good or service, discuss the economic impact that a challenging societal factor such as the increasing mindfulness of the importance of organic...
-
Tim is a producer of Christmas trees in a perfectly competitive market that is currently in long run equilibrium at the price of $50. At equilibrium quantity of 100 trees, Tims average variable cost...
-
Describe in detail the Concepts of Marcus Gravey.
-
Question 1. Create Cited Reference over Fiscal Years 2020 and 2021 Here is a link below to create Cited Reference:...
-
A company's 5-year bonds are yielding 7.75% per year. The real risk-free rate (r*) is 2.3%. The average inflation premium is 2.5%; and the maturity risk premium is estimated to be 0.1 (t 1)%, where...
-
Lattimer co. Sales 15000 units at 12 180000 Variable Mfg. cost 97500 Fixed mfg. cost 21000 selling and adm exp. 36000 154500- operating income 25,500 A foreign co whose sales will not affect lattimer...
-
A bank pays 6% interest per year, compounded quarterly. To what amount will a $5000 deposit grow if left in that bank for 10 years?
-
Define Managerial Accounting and explain the difference between Financial and Managerial Accounting.
-
1.) Find the demand equation using the given information. (Let x be the number of items.) A company finds that it can sell 50 items at a price of $90 each and sell 100 items at a price of $60 each....
-
A statistical study shows that the fraction of television sets of a certain brand that are still in service after x years is given by f (x) = e-0.15x. (a) What fraction of the sets are still in...
-
When can a solution of a weak base be more corrosive than a solution of a strong base?
-
As wind blows across the land surface, it picks up small particles of sand. You can demonstrate how wind moves sediment: Cover the bottom of a cake pan with a flat layer of cornmeal (about 2 cm...
-
How are amides and carboxylic acids related to each other? How are they different from each other?
-
Figure P19.4 shows two hot streams and two cold streams for heat integration (subject to \(\Delta T_{\min }=20^{\circ} \mathrm{C}\) ). (i) What are the energy targets? (ii) Show a network design...
-
Figure P19.5 shows an existing design of a process plant, containing two exothermic processes. These require streams of reactants as shown in the diagram, and produce products at the temperatures...
-
A network for a process plant is shown in Fig P19.7. (a) Calculate the energy targets for \(\Delta T_{\min }=10{ }^{\circ} \mathrm{C}\) and show a design that achieves these targets. (b) Explain why...
Study smarter with the SolutionInn App