chm1020-w10-lab-assignment

Name(s):______Casey Zufall __________________________ CHM 1020 W10 Week 10 Assignment Part A: A. Watch Nuclear Science and Radioactivity and answer questions pertaining to it: https://www.youtube.com/watch?v=zmwIQK1DqQk 1. In this demonstration, what instrument was used to measure radioactivity? Geiger-Muller counter 2. What element was used to make the numbers of the watch glow in the dark? Radium 3. A) Two forms of radiation are produced by this element. What are they? Ionizing radiation and non-ionizing radiation B) Which form of radiation was detected by the instrument? Ionizing radiation B. Watch the Concepts of Isotopes and answer questions pertaining to it: https://www.youtube.com/watch?v=oLnuXpf4hsA 1. What subatomic particles affect the mass of an atom? a. Protons b. Neutrons c. Electrons d. Protons and Neutrons e. Neutrons and Electrons 2. Which isotope of Hydrogen was the heaviest? Why, what causes it to be heavier than the others? Tritium is heaviest due to the high mass number C. Watch the Radiation of Objects and answer questions pertaining to it: https://www.youtube.com/watch?v=pmo_w-dQ4JE 1. What was the element that was measured in the fertilizer? Uranium 2. What was the element that was measured in the camping lantern? Thorium 3. A) What was the element that was measured in the smoke detector? Americium B) What kinds of radiation does this element emit? Gamma radiation C) What happened when the paper was placed between the instrument and the smoke detector? How is this result used in smoke detectors in homes? The paper blocks a small amount of the radiation. This helps give an early alert to smoke in the home

Name(s):______Casey Zufall __________________________ CHM 1020 W10 Part B: Multiple Choice 1. Which particle has a negative charge? A. Alpha particle B. Positron C. Neutron D. Beta particle 2. Which particle has the same mass as an electron, but a positive electric charge? A. Alpha particle B. Gamma photon C. Proton D. Positron 3. Which of the following gives the correct order for energies of portions of the electromagnetic spectrum? A. radio > visible light > gamma > ultraviolet > infrared B. visible light > ultraviolet > infrared > radio > gamma C. radio > infrared >ultraviolet > gamma > visible light D. gamma > ultraviolet > visible light > infrared > radio 4. Which of the following affects the half-life of a radioactive sample? A. The age of sample B. The size of the sample C. The temperature of the sample D. None of these 5. Which radioactive element, if ingested, is primarily incorporated into bone tissue? A. Uranium B. Radon C. Radium D. Thorium 6. The process that generates energy in the sun and stars is A. Fusion B. Fission C. ß-emission D. Positron emission

Name(s):______Casey Zufall __________________________ CHM 1020 W10 13. Curium – 245 is an alpha emitter. Write the equation for the nuclear reaction and identify the product nucleus. A Z X  A-4 Z-2 X + 4 2 He 245 96 Cm  241 94 Pu + 4 2 He Plutonium is the product nucleus 14. In the equation 228 90 Th → 228 91 Pa + X which particle is represented by X? It’s beta decay in which atomic number increases 15. Americium – 242 is a beta emitter. Write an equation for this nuclear reaction and identify the product nucleus. A Z X  A Z+1 X + -1 e 242 95 Am  242 96 Cm + -1 e Curium is the product nucleus 16. Bismuth – 210 is an alpha emitter. Write an equation for this nuclear reaction and identify the product nucleus. A Z X  A-4 Z-2 X + 4 2 He 210 83 Bi  206 81 Tl + 4 2 He Thallium is the product nucleus 17. Phosphorus – 29 is a positron emitter. Write an equation for this nuclear reaction and identify the product nucleus. A Z X  A Z-1 X + +1 e 29 15 P  29 14 Si + + e Silicone is the product nucleus 18. Samarium – 151 is a beta emitter. Write an equation for this nuclear reaction and identify the product nucleus. A Z X  A Z+1 X + -1 e 151 62 Sm  151 63 Eu + -1 e Europium is the product nucleus 19. How much of a 24-gram sample of Radium-226 will remain unchanged at the end of three half-life periods? In first half life, 12 grams will decay In second half life, 6 grams will decay In third half life, 3 grams will decay, leaving 3 grams unchanged 20. Iodine – 125 emits gamma rays when it decays to Tellerium-125 and has a half-life of 60 days. If a 0.020 g pellet of iodine – 125 is implanted into a prostate gland, how much iodine – 125 remains there after one year? 365 days/60 days = 6.08 half lives (n) N – amount of substance after ‘t’ time

Name(s):______Casey Zufall __________________________ CHM 1020 W10 N o - Initial amount of substance (N/N o ) = (1/2) n (N/0.020) = (1/2) 6.08 = 1/67.64915 (N/0.020) = 0.01478 N = 0.01478 * 0.020 = 0.0002956 Amount of Iodine after one year is 0.0003g 21. Barium – 122 has a half-life of 2 minutes. Suppose you obtain a sample weighing 10.0 g and it takes 10 minutes to set up an experiment. How many grams of Barium – 122 will remain at the point when you begin the experiment? Half life 1 – 5g decay Half life 2 – 2.5g decay Half life 3 – 1.25g decay Half life 4 – 0.625g decay Half life 5 – 0.3125g decay leaving 0.3125g remaining 22. A normal adult jawbone contains 200 mg of Carbon-14 in a living person. If scientists found a jawbone that only had 50mg of Carbon-14, how old is the bone? (The half-life of C-14 is 5730 years). Age of the bone = number of half lives * half life time 2*5730 years The bone is 11460 years old