The 14C/12C ratio in papyrus currently growing near the Nile River is 1.8 times greater than that found in a scroll found near the Great Pyramid at Giza. How old is the scroll? t1/2(14C) = 5730 years.
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- The 14C/12C ratio in papyrus currently growing near the Nile River is 1.8 times greater than that found in a scroll found near the Great Pyramid at Giza. How old is the scroll? t1/2(14C) = 5730 years.
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- In hydrocarbon exploration, the stable carbon isotope composition of a hydrocarbon, expressed as δ13C, depends on three major factors. List these factors.Determining Diet. One method for determining the amount of corn in early Native American diets is the stable isotope ratio analysis (SIRA) technique. As corn photosynthesizes, it concentrates the isotope carbon-13, whereas most other plants concentrate carbon-12. Overreliance on corn consumption can then be correlated with certain diseases, because corn lacks the essential amino acid lysine. Archaeologists use a mass spectrometer to separate the 12C and 13C isotopes in samples of human remains. Suppose you use a velocity selector to obtain singly ionized (missing one electron) atoms of speed 8.50 km /s, and you want to bend them within a uniform magnetic field in a semicircle of diameter 25.0 cm for the 12C. The measured masses of these isotopes are 1.99 * 10-26 kg (12C) and 2.16 * 10-26 kg (13C). (a) What strength of magnetic field is required? (b) What is the diameter of the 13C semicircle? (c) What is the separation of the 12C and 13C ions at the detector at the end of the…What proportion of the 14C present in Otzi's body when he died is still there today? When he died, it would have been 1.0 .
- 11. At death, a nobleman in ancient Egypt was mummified and his body contained 1.4 x 103 g of potassium-40 (t1/2 = 1.25 x 10° yr), 1.2 x 108 g of carbon-14 (t1/2 = 5730 yr) and 4.8 x g of tritium (hydrogen-3) (t1/2 = 12.26 yr). Calculate the mummy's age with all three elements and then identify which element gave the most accurate estimate of the mummy's age. 10-14 100% Give Feedback to Micro TSC CROCKETT IVYIn a functional assay, you find that your purified hCG sample has an activity of 20,000 mIU/ml (where mIU is milli international units). You make a standard curve and determine that the concentration of a 100-fold diluted aliquot of your hCG is 0.05 µg/ml. What is the activity in mIU/mg of your purified sample? 4 x 10^5 5 x 10^7 4 x 10^6 4 x 10^7A chemist attached a NFPA symbol (illustrated below) on the bottle of a newly manufactured chemical. If the chemical is unstable if heated, what must be the reactivity grade of the hazard in the posted area?
- You have a 11.5 mg sample of blood that contains various proteins. Hemoglobin is the only protein in the sample containing Fe. Hemoglobin contains 3.83% by mass of a compound called heme (C34H32FEN.O4, MW = 616.49 g/mol). You find that your 11.5 mg blood sample contains 10.9 micrograms of Fe. What is the mass percent of hemoglobin in your protein sample?Why is lead(Pb) connected with chemistry and biology?Seawater contains 2.80 x 10-3% (by mass) of carbon. How many grams of carbon are there in 3.52 L of seawater? The density of seawater is 1.025 g/cm°.
- Petroleum is a fossil fuel containing many different carbon compounds. If the carbon atoms in petroleum have been in the ground for 100 million years, what fraction of the initial 14C atoms is still there? (t1/2 = 5,370 yr)14. Using a mass spectrometer, a sample of an ancient wooden object was found to have a ratio of 14C to 12C equal to 3.3×10 −13 as compared to a current biological sample, which has a ratio of 14C to ¹2C of 1.2×10 −12 (Given: t, is 5730 years) What is the age of the object? 15. For the reaction, 2 A(g) + B₂(g) → 2 AB(g) The rate law is; rate = k[A][B₂]³ At 22.0 °C, k = 1234 M-³s-¹. What would be the rate of the reaction if the concentration of A is 0.100 M and concentration of B₂ is 0.125 M.Write a balanced nuclear reaction for the decay of tin-127 by beta particle Draw a skeletal structure for the molecule 1,7-dibromo-3-ethyl-4-propyloctane For the balanced reaction Mn2(SO4)5(aq) + 10LiOH(aq) --> 2Mn(OH)5(s) + 5Li2SO4(aq)how many grams of lithium sulfate are produced by this reaction if 148 g of manganese (V) hydroxide are also produced?