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MODELING ISOTOPES

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PAGE 120 IN TEXTBOOK USE THE INFORMATION ON PAGE 120 TO WRITE THE PROCEDURE. REMEMBER TO FOLLOW CORRECT LAB REPORT FORMAT. SET UP THE DATA TABLE AS SHOWN ON THE NEXT SLIDE. THE REST OF THE REPORT WILL BE COMPLETED IN CLASS.

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OBSERVATION AND DATA (SAMPLE) NUMBER OF PENNIES (a) MASS, g (b) AVERAGE MASS (c) PERCENT ABUNDANCE (d) PRE-1982 POST-1982

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HINTS (i) COLUMN (a) = NUMBER OF PENNIES COUNTED FOR EACH GROUP (ii) COLUMN (b) = AS MEASURED ON A BALANCE. (iii)COLUMN (c) = (b) DIVIDED BY NUMBER OF PENNIES IN EACH GROUP. (iv) COLUMN (d) = NUMBER OF PENNIES COUNTED FOR EACH GROUP DIVIDED BY TOTAL NUMBER OF PENNIES IN BOTH GROUPS x 100.

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CALCULATIONS PERCENT ABUNDANCE NUMBER OF PENNIES COUNTED FOR EACH GROUP DIVIDED BY TOTAL NUMBER OF PENNIES IN BOTH GROUPS x 100.

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MASS CONTRIBUTIONS PRE-1982 MASS CONTRIBUTION, (e) = (% ABUNDANCE, (d) x MASS, (b)) POST-1982 MASS CONTRIBUTION, (f) = (% ABUNDANCE, (d) x MASS, (b))

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AVERAGE ATOMIC MASS AVE. ATOMIC MASS = (e) + (f)

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ANALYSIS AND CONCLUSION ANALYSIS ANSWER QUESTIONS 3 AND 4. BE SURE TO PROVIDE EXPLANATION CONCLUSION MUST WRITE A SUMMARY STATEMENT DESCRIBING WHAT YOUR OBSERVATION AND DATA MEAN.

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