Exam 3 Chem 111 Fa23 vA KEY

The cleanup of threat of toxic nuclear isotopes can be permanently eliminated by simply storing it in steel drums and dropping them in the Ocean. True or False?

In ______, an _ particle (identical to a helium nucleus of two protons and two neutrons) is ejected from an unstable nucleus, creating a new element with two fewer protons.

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Engaging ActivitiesACTIVITY 1Directions: Identify the element described in each statement.___________1. An element with 26 protons and 30 neutrons.___________2. Has a mass number of 11 and an atomic number of 5.___________3. Has 117 neutrons and an atomic number of 78.___________4. Has 69 neutrons and 50 protons.___________5. Has 125 neutrons and an atomic number of 85.

Collision of matter with its corresponding anti-matter produces ___________. neutrons gamma rays beta postive particles protons electrons

An archeologist was investigating a dig site and found charcoal in a pre-historic fire pit. Charcoal consists mostly of the element carbon. There are three naturally occurring isotopes of carbon: 12C, 13C, and 14C. Carbon-14 is radioactive and can be used to date the charcoal. The archeologist collected a sample for testing and learned that the carbon-14 activity was found to be 10 counts per minute. A sample of new charcoal of similar size showed a carbon-14 activity of 640 counts per minute.   How many carbon-14 half-lives have occurred?   Estimate the age of the charcoal. (The half-life of 14C is 5,730 years.)

____________________________ is the penetrating rays and particles emitted by a radioactive source.     transmutation nuclear chemistry radioisotopes radiation

The total number of protons and neutrons present in anucleus is known as the ___________.

What Nuclear Fission and Nuclear Fussion? What the difference between these two?

The radioactive isotope strontium-81 is used in medical imaging as indicated on the table above. If 77.1 milligrams of strontium-81 is administered to a patient, how many milligrams are left in the body after 66.6 minutes?__ mg

What is the universal symbol for radioactive materials and radioactive waste?

MINI TASK #1 Research on Hydrogen isotopes and their applications. Submit a written report.

Nuclear __________ powers the sun and hydrogen bombs.     fission     fusion

A small fraction of all the carbon in living things is radioactive. True or false

Iodine-125 is radioactive and has a half life of 60.25 days. How much of a 8.10 mg sample would be left after 58.8 days? Round your answer to 2 significant digits. Also, be sure your answer has a unit symbol. 0 x10 X μ Ś ? 000

Answer the following questions about penetrating power and shielding abilit: (a) Put the following shields in order of best shield to worst shield, assume that they are all of the same thickness. What physical property did you use to determine this order? Aluminum, cardboard, copper, lead, plastic (b) Put the following radioactive particles in order of greatest penetrating power to lowest penetrating power. Why did you choose this order? Beta particle, gamma ray, neutron, alpha particle

QUESTION 12 The symbol   e is a symbol used for a(n)     alpha particle.     neutron.     beta particle.     proton.     gamma ray.

Cesium-137 is radioactive and has a half life of 30. years. How much of a 8.10 mg sample would be left after 12.9 years? Round your answer to 2 significant digits. Also, be sure your answer has a unit symbol. 0 x10 X μ

Question 1 Please

27 Al 3t 13   what is the number of proton neutron and electron

Unstable isotopes are not radioactive. O True O False

Nuclear Chemistry Writing Assignment

The naturally occurring radioactive isotope of __________ is used to date ancient artifacts.     oxygen     hydrogen     radium     carbon     lead

Part of a series of radioactive elements is seen in table 1. Nuclide A changes to nuclide B with the emission of an a particle, nuclide B changes to nuclide C with the emission of a 3 particle, etc. Using table 1, answer the following questions. Atomic Number Nuclide A B C D E F i. ii. 90 88 i. ii. 89 90 88 b. For nuclide F, state its Atomic number Nucleon number Nucleon Number 232 228 228 228 a. State which particle is emitted when Nuclide C changes to nuclide D Nuclide D changes to nuclide E 224 Table 1 Radiation Emitted a В a α Half Life 1.4 x 10¹0 years 6.7 years 6.1 years 1.9 years 3.6 days 52 seconds c. Which nuclides are isotopes to each other? d. Briefly explain how the activity of a given mass of sample of nuclide C might be determined.

q eq # P E D C P HP Cr !!Fe Ga Se Kr Sr 99Te AI 1Hg 201TI [Review Topics] Some Radioactive Isotopes Useful in Medical Imaging Isotope Carbon-11 Fluorine-18 Phosphorus-32 Chromium-51 Iron-59 Gallium-67 Selenium-75 Krypton-81m Strontium-81 Technetium-99m 4 Iodine-131 Mercury-197 Thallium-201 R F % 5 Mode of Decay B+, y B+, Y B T E.C., Y B.Y E.C., Y E.C., Y G Y B Y B, Y E.C., y E.C., Y (1) The radioactive isotope selenium-75 is used in medical imaging as indicated on the table above. How many protons and neutrons are there in a selenium-75 atom? protons neutrons (2) When the nuclide selenium-75 decays as indicated on the table: the number of protons in the product nuclide is: the number of neutrons in the product nuclide is: the name of the product nuclide is: Half-life 20.3 m 109 m 14.3 d ^ 27.7 d 44.5 d 78.3 h 118 d 6 13.3 s 22.2 m 6.01 h 8.04 d 64.1 h 3.05 d Cengage Learning | Cengage Technical Support Use in Medical Imaging Brain scan to trace glucose metabolism Brain scan to trace…