Atomic Mass Agenda Review (whiteboards) Read 4.7 & 4.8 Notes Homework.
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Transcript of Atomic Mass Agenda Review (whiteboards) Read 4.7 & 4.8 Notes Homework.
![Page 1: Atomic Mass Agenda Review (whiteboards) Read 4.7 & 4.8 Notes Homework.](https://reader035.fdocuments.net/reader035/viewer/2022081519/56649f305503460f94c4b7cc/html5/thumbnails/1.jpg)
Atomic MassAgenda
Review (whiteboards)Read 4.7 & 4.8 NotesHomework
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Parts of Atomic Theory
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How do isotopes differ?
![Page 4: Atomic Mass Agenda Review (whiteboards) Read 4.7 & 4.8 Notes Homework.](https://reader035.fdocuments.net/reader035/viewer/2022081519/56649f305503460f94c4b7cc/html5/thumbnails/4.jpg)
How do ions differ?
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146C
____ p+
____ e-
____ no
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94Be+2
____ p+
____ e-
____ no
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3617Cl-
____ p+
____ e-
____ no
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READGrab bookRead section 4.7 & 4.8 w/ partner
Six inch voices
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Average Atomic Massdate
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Average atomic massA WEIGHTED average dependent on the
percent abundance of each isotope.If all isotopes were in a bag, how frequently
would you pull out each separate isotope.Measured in amu’s
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Atomic Mass UnitAn amu is the mass of a single proton.
1 amu = 1.67*10-24 g
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Determining Average MassMultiply Mass number by Percent abundance.
Add the answers.Answer should be close to most abundant isotope.
![Page 13: Atomic Mass Agenda Review (whiteboards) Read 4.7 & 4.8 Notes Homework.](https://reader035.fdocuments.net/reader035/viewer/2022081519/56649f305503460f94c4b7cc/html5/thumbnails/13.jpg)
ExampleCesium is 75% 133Cs, 20% 132Cs, 5%
134Cs. What is the average atomic mass?
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ExampleChromium has four istopes. 4.35% 50Cr, 83.79% 52Cr, 9.5% 53Cr, 2.36% 54Cr. What is the average atomic mass of Cr?
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Determining % abundance Create an equation equaling average atomic
massMass1 * %X + Mass2 * %Y = average atomic
massCreate an equation equaling 100%
X + Y = 1Use substitution to solve for x.
Mass1 * %X + Mass2 * %(1-X) = average atomic mass
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The average atomic weight of boron is 10.812amu. Boron has two isotopes: boron-10 with a mass of 10.013 and boron-11 with a mass of 11.009. What are the % abundances of each isotope?
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What are the % abundances of the two isotopes of rubidium?Rb-85, 84.9918 amuRb-87, 86.9092 amu
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HomeworkComplete isotopes and average atomic mass worksheet
Review scientists and discoveries.
Lab report due Rough draft WednesdayFinal draft Friday