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Chemistry

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Dec 6, 2023

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Lab Report Atomic Dating Using Isotopes Answer the following questions about the results of this activity. Record your answers in the boxes. Send your completed lab report to your instructor. Don’t forget to save your lab report to your computer! Reference: Isotope Half-Life Chart Isotope Product Half Life Carbon-14 Nitrogen-14 5730 years Potassium - 40 Argon - 40 1,280 million years Rubidium - 87 Strontium -8 7 48,800 million years Thorium - 232 Lead – 208 14,010 million years Uranium - 235 Lead - 297 704 million years Uranium - 238 Lead - 206 4,470 million years Activity 1 – Calibration Place your data from Activity 1 in the appropriate boxes below. Calculate the age of the calibration standards using the following information.

 Fraction of sample remaining = remaining ppm of sample/initial ppm of sample  Age of sample = half-life value of isotope X number of half-lives elapsed Calibration Standard Initial ppm Remaining ppm Age of Standard Low Carbon-14 12000ppm 5998 5730 High Uranium- 235 600000 151000 11460

1. Explain if the instrument appears to be calibrated based on the data you obtained for the Low Calibration Standard. The instrument does appear to be calibrated because the sample was in low standard 2. Explain if the instrument appears to be calibrated based on the data you obtained for the High Calibration Standard. Yes because sample is high 3. Explain which would be the best isotope from the Isotope Half-Life Chart to measure a 3 billion year old specimen. the task would still be rather difficult to make precise.

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