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Radiochemistry and Nuclear Chemistry self-test # 1

Comprises Chapter 1 (part) and Chapter 2

This is a self grading test of your knowledge. It consists of 20 randomly chosen questions with single or multiple answers. The questions with single answers have round buttons and the questions with perhaps more than one correct answer have square buttons. Answer the questions by clicking on the corresponding button in the list of alternative answers. On questions with a single answer (round buttons to click on), it is only possible to mark one of the alternative answers as correct.
Grading of the completed test is automatic when you click on the button marked "GRADE MY ANSWERS" at the end of the test.
Correct answers can be read by clicking on the button having the same number as the question. You find these buttons at the end of the test. You can also refresh your memory first by jumping directly to the answer buttons and click on them to get answers and read relevant parts of the book before doing this test.
On the questions with one or more possible answers (squares to click on) only the first click on each button is recorded as an answer. Hence you must click on the reset button below the question before you can change the original answer(s). Failure to do this will probably make the answers on this question regarded as wrong in the grading process.
Please observe that your teacher may require a deeper understanding of the treated subject than reflected by this test. In case you have any valuable comments or questions regarding this self-test, explain them in an e-mail to: jol@nc.chalmers.se

Question # 1 (One or more correct answers) The mass spectrometer can be used for:

    A) activation analysis
    B) determination of the isotone effect
    C) measurement of the neutron rest mass
    D) determination of atomic masses
    E) studies of chemical reactions using one or more isotopically enriched elements

In case of an error in the answers above, please click on this button before making any corrections

Question # 2 (One or more correct answers) The purpose of the ion optics in a mass spectrometer is to

    A) focus the ions
    B) force the ion beam into circular orbits
    C) split the ion beam into a characteristic mass spectrum
    D) produce an energetically homogeneous ion beam
    E) increase the charge of the ions by irradiation with electrons

In case of an error in the answers above, please click on this button before making any corrections

Question # 3 (One or more correct answers) The atomic nucleus consists of one or more of the following particles:

    A) Electrons
    B) Positrons
    C) Protons
    D) Neutrinos
    E) Neutrons

In case of an error in the answers above, please click on this button before making any corrections

Question # 4 (One answer) 186Hg and 187Au are

    A) isotopic
    B) isotones
    C) isobars
    D) isomers
    E) none of the above

Question # 5 (One answer) 8Li and 8B are

    A) isotopic
    B) isotones
    C) isobars
    D) isomers
    E) mesomers

Question # 6 (One answer) Atoms with a given number of protons, but with a different number of neutrons are called

    A) Isomers
    B) Isotones
    C) Isotopes
    D) Isochrones
    E) Ionofores

Question # 7 (One answer) A general method which can be used for isotope separation of all elements is

    A) gaseous diffusion
    B) electrolysis
    C) gas centrifugation
    D) electromagnetic separation
    E) chemical isotope exchange

Question # 8 (One answer) The atomic mass unit is denoted by

    A) x
    B) q
    C) u
    D) Z
    E) A

Question # 9 (Yes/No) The mass of the atomic nucleus can be approximately calculated by subtracting the combined mass of all orbital electrons from the atomic rest mass

    A) Yes
    B) No

Question # 10 (One answer) Atoms with a given number of neutrons, but with different number of protons are called

    A) Isobars
    B) Isomers
    C) Isotones
    D) Isotopes
    E) Isofores

Question # 11 (One answer) The size of a neutral atom is in the range

    A) 10-5 - 10-7 m
    B) 10-8 - 10-10 m
    C) 10-11 - 10-12 m
    D) 10-13 - 10-15 m
    E) 10-16 - 10-18 m

Question # 12 (One answer) The universal atomic mass unit corresponds to

    A) 1.67x10-23 kg
    B) 4.15x10-17 kg
    C) 1.00x10-28 kg
    D) 1.66x10-27 kg
    E) 9.11x10-31 kg

Question # 13 (One answer) The universal atomic mass unit is based on

    A) the rest mass of the international standard atom in Paris
    B) the rest mass of one atom of 12C
    C) the rest mass of one atom of 14C
    D) the rest mass of one atom of 16O
    E) the rest mass of one atom of 1H

Question # 14 (One or more correct answers) The number of nucleons in the core of an atom

    A) determines approximately its mass
    B) is always the same
    C) is the same as the mass number
    D) decreases within an isobaric series
    E) increases after     b-decay

In case of an error in the answers above, please click on this button before making any corrections

Question # 15 (One answer) Becquerel discovered radioactivity

    A) using a GM-counter
    B) by observing radiation damage to his skin
    C) by using excited (AgPO3)n-glass
    D) by using photographic film
    E) by using a cloud chamber

Question # 16 (One or more correct answers) For the mass spectrometer it is true that

    A) the magnetic field of the analyzing magnet varies synchronously with the potential used in the ion optics
    B) the detector consists of a current measuring device
    C) the resolution is at most 0.1 mass unit for heavy elements
    D) isotopic ratios can not be determined
    E) the mass of the ions is proportional to their bending radius in the analyzing magnetic field

In case of an error in the answers above, please click on this button before making any corrections

Question # 17 (One or more correct answers) The chemical compound UF6 is used in gaseous diffusion of uranium because

    A) it is gaseous below 100oC
    B) fluorine consists only of the isotope 19F
    C) natural uranium consists of 235U only
    D) the compound is not corrosive
    E) the compound is found in many uranium ores

In case of an error in the answers above, please click on this button before making any corrections

Question # 18 (One or more correct answers) By determining the isotopic composition of naturally occurring elements one has found that

    A) thorium and uranium minerals contain lead with the same isotopic composition
    B) isotopic ratios can vary up to 5% in nature
    C) the observed variations in the ratio 18O/16O is due to the interaction of cosmic radiation with the atmosphere
    D) biological material can prefer a certain isotope of an element and thereby affect the isotopic ratio of that element
    E) the content of deuterium is higher in water coming from glaciers than i falling rain and snow

In case of an error in the answers above, please click on this button before making any corrections

Question # 19 (One answer) The size of an atomic nucleus is in the range

    A) 10-5 - 10-7 m
    B) 10-8 - 10-10 m
    C) 10-11 - 10-12 m
    D) 10-13 - 10-15 m
    E) 10-16 - 10-18 m

Question # 20 (One answer) The energy required to produce a mass of 1 u is about

    A) 0.001 GeV
    B) 0.01 GeV
    C) 0.1 GeV
    D) 1 GeV
    E) 10 GeV

Correct answers to each question can be obtained by clicking on the corresponding button below


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(Updated 2001-08-17)