Chemistry – Nov 6, 2017 P3 Challenge- Objective –

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Presentation transcript:

Chemistry – Nov 6, 2017 P3 Challenge- Objective – Given 11B, determine the number of protons, electrons and neutrons in a neutral atom. Then state the atomic number and the mass number for this isotope. Objective – Atomic Mass Beanium Lab Activity Get out Atoms and Mass Worksheet for Hmk check

Chemistry – Nov 2, 2017 Agenda – Homework Review Atomic Mass Beanium Lab Activity Three isotope names of beans are like chocolates: White, Milk, and Dark Assignment: - Beanium Lab Activity questions

Atomic Mass Given the symbol m Average mass of the atom in amu (decimal value) Weighted average Each isotope has its own atomic mass For any sample of an element, the particular isotopes present will reflect to natural abundance of each type of isotope found on earth.

Percent Abundance Percent abundance: given of a sample of 100 atoms, how many will be a given isotope. Ex: Ne-20 90.48% Ne-21 0.27% Ne-22 9.25% Each isotope has its own mass: 19.992440, 20.993847, 21.991386 http://www.chem.ualberta.ca/~massspec/atomic_mass_abund.pdf

Average Atomic Mass Atomic Mass on periodic table is a weighted average. To calculate atomic mass Let Mn= the mass of isotope n (amu) Let abn= the relative abundance of isotope n (percent as a decimal)

Beanium Lab Beanium is an element consisting of three kinds of beans (isotopes) White chocolate beans Milk chocolate beans Dark chocolate beans You will receive a sample of Beanium that is a mixture of isotopes and become a “bean counter” You will measure the percent abundance of each type of bean and the average mass of each type of bean (% abundance = # white/total # x 100) You will use this percent abundance and average mass data to calculate the average atomic mass of Beaninum.

Exit Slip - Homework Exit Slip: Clean up your lab space with a zero impact from when you came in. What’s Due? (Pending assignments to complete.) Atoms Ion and Mass Worksheet. (Skip back of Atoms and Mass Worksheet) Beanium Lab Activity questions What’s Next? (How to prepare for the next day) Read Holt p84 - 88