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A Chemistry student at Agora is calculating the average atomic mass of Potassium using the following data. Isotope K-39 K-41 Relative abundance 93.12 % 6.88 % Their setup and calculation are. Mass (amu) 38.964 40.962 X Atomic Mass 38.964 amu 40.962 amu Relative Abundance (% divide by 100) 0.0688 What did the student do incorrectly? Use CER! 0.9312 = 2.681 = 38.144 40.823 amu The student calculated the average atomic mass to be 40.823 amu but it is 39.098 amu on the periodic table.

A Chemistry student at Agora is calculating the average atomic mass of Potassium using the following data. Isotope K-39 K-41 Relative abundance 93.12 % 6.88 % Their setup and calculation are. Mass (amu) 38.964 40.962 X Atomic Mass 38.964 amu 40.962 amu Relative Abundance (% divide by 100) 0.0688 What did the student do incorrectly? Use CER! 0.9312 = 2.681 = 38.144 40.823 amu The student calculated the average atomic mass to be 40.823 amu but it is 39.098 amu on the periodic table.

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter2: Chemical Compounds
Section: Chapter Questions
Problem 27QRT
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What did the student do incorrectly Use CER! Claim: (answer the question) Evidence: (point readers to the part of the image that supports your claim) Reasoning: (define and use the definition to support why you pointed to that part of the image.) An example of a chemistry CER is the second image.
CLAIM: (Answer the question.) The half-life is about 11 seconds. EVIDENCE (Point readers to the part of the image that supports your claim.) We have to locate the amount of radioactive material (nuclei) and we need to find its quantity 50%. So, point y-axis at 50% and move your pointer towards time which is on the x-axis and note. Doing this I found that the half-life is 11 seconds. REASONING: (Define half life and use the definition to support why you pointed to a specific part of the image to make your claim.) Half-life is the time it takes for half of the original amount of a radioactive sample to decay. On the y-axis when undecayed nuclei is 50%, it means 50% of nuclei has reacted and it gives the half-life of an isotope.
Transcribed Image Text:CLAIM: (Answer the question.) The half-life is about 11 seconds. EVIDENCE (Point readers to the part of the image that supports your claim.) We have to locate the amount of radioactive material (nuclei) and we need to find its quantity 50%. So, point y-axis at 50% and move your pointer towards time which is on the x-axis and note. Doing this I found that the half-life is 11 seconds. REASONING: (Define half life and use the definition to support why you pointed to a specific part of the image to make your claim.) Half-life is the time it takes for half of the original amount of a radioactive sample to decay. On the y-axis when undecayed nuclei is 50%, it means 50% of nuclei has reacted and it gives the half-life of an isotope.
1. A Chemistry student at Agora is calculating the average atomic mass of Potassium using the following data. Isotope K-39 K-41 Relative abundance Mass (amu) Their setup and calculation are. 93-12% 6.88% 38.964 40.962 X Atomic Mass 38.964 amu 40.962 amu Relative Abundance (% divide by 100) What did the student do incorrectly? Use CER! 0.0688 0.9312 = 2.681 = 38.144 40.823 amu The student calculated the average atomic mass to be 40.823 amu but it is 39.098 amu on the periodic table.
Transcribed Image Text:1. A Chemistry student at Agora is calculating the average atomic mass of Potassium using the following data. Isotope K-39 K-41 Relative abundance Mass (amu) Their setup and calculation are. 93-12% 6.88% 38.964 40.962 X Atomic Mass 38.964 amu 40.962 amu Relative Abundance (% divide by 100) What did the student do incorrectly? Use CER! 0.0688 0.9312 = 2.681 = 38.144 40.823 amu The student calculated the average atomic mass to be 40.823 amu but it is 39.098 amu on the periodic table.
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