nuc

  • 1

    •

    Uranium-235 emits alpha radiation. Select the best statement about Uranium-235

    The mass number is 235
    It has 92 protons
    It has 143 neutrons
    All these choices are correct

  • 2

    •

    The isotope produced from the alpha decay of Plutonium-238 is

    238Am
    234U
    234Th
    242Cm

  • 3

    •

    Select the best statement given below. Consider the daughter isotope produced from the alpha decay of Bismuth-198

    The daughter has 81 protons
    The daughter is 194 Tl
    Two of the above choices are correct
    none of these choices are correct

  • 4

    •

    Select the best statement below. Consider the daughter isotope produced from the beta decay of Aluminum-28

    The daughter has 28 neutrons
    The daughter has an atomic number of 14
    The daughter is 28Si
    Two of the above choices are correct

  • 5

    •

    An unknown isotope undergoes beta decay producing Zinc-66. Select the parent isotope

    66Cu
    66Ga
    66Ge
    none of these choices are correct

  • 6

    •

    Iodine-131 emits both, beta and gamma radiation. Select the best statement about the daughter isotope produced

    the daughter produced is 131Xe
    the daughter has a mass number of 54
    the daughter produced is 131Te
    Two of these choices are correct

  • 7

    •

    Which of the following is required as shielding from gamma rays?

    Paper
    Wood
    Lead
    Air

  • 8

    •

    A wooden prehistoric object has a carbon-14 activity of 10 counts per minute (cpm) compared to 40 cpm for new wood. If carbon-14 has a half-life of 5730 years, estimate the age of the wood.

    5,730 years
    22,920 years
    11,460 years
    17,190 years

  • 9

    •

    The half-life of potassium-42 is 12 hr. How much of a 4.0 mg sample is still active after 36 hr?

    1.0 mg
    0.5 mg
    2.0 mg
    0.25 mg

  • 10

    •

    In the sun, nuclei of hydrogen combine to form a larger nucleus and release enormous amounts of energy. This process is called:

    Ionization
    Fission
    Fusion
    Chain reaction

  • 11

    •

    Nitrogen-14 has an actual mass of 14.00307 amu. Find the Binding Energy in KJ/mole of nitrogen-14 knowing that the mass of a proton, neutron and electron are respectively 1.0073 amu, 1.0087amu, 0.00054858 amu

    1.01 x 1010
    1.01 x 1013
    1.13 x 10-4
    none of these are correct

    Please enter your Chemistry student number and press the SEND button.