MCAT Chemistry practice questions

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brittiny4893
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246567
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MCAT Chemistry practice questions
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2013-11-12 16:03:27
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Chemistry quesitons
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  1. Which of the following is the correct electron configuration for Zn2+?
    A) 1s22s22p63s23p64s03d10.
    B) 1s22s22p63s23p64s23d10.
    C) 1s22s22p63s23p64s03d8.
    D) 1s22s22p63s23p64s23d8.
    A) 1s22s22p63s23p64s03d10.
    (this multiple choice question has been scrambled)
  2. Which of the following quantum number sets describes a possible element?
    A) n=2; l=2; ml=1; ms=+1/2
    B) n=2; l=1; ml=-1; ms=+1/2
    C) n=2; l=0; ml=-1; ms=-1/2
    D) n=2; l=0; ml=1; ms=-1/2
    B) n=2; l=1; ml=-1; ms=-1/2
    (this multiple choice question has been scrambled)
  3. What is the maximum number of electrons allowed in a single atomic energy level in term of the principal quantum number n?
    A) 2n2+2
    B) 2n2
    C) 2n
    D) 2n+2
    B) 2n2
    (this multiple choice question has been scrambled)
  4. Which of the following equations describes the maximum number of electrons that can fill a subshell?
    A) 2l+2
    B) 4l+2
    C) 2l2
    d) 2l2+2
    B) 4l+2
    (this multiple choice question has been scrambled)
  5. Which of the following substances is most likely to have only paired electrons in its standard state?
    A) Sodium
    B) Iron
    C) Cobalt
    D) Helium
    D) Helium
    (this multiple choice question has been scrambled)
  6. An electron returns from an excited state to its ground state, emitting a photon at 500nm. What would be the magnitude of the energy change if this process were repeated such that a mole of these photons were emitted?
    A) 2.39E3 J
    B) 2.39E5 J
    C) 3.98E-21 J
    D) 3.98E-19 J
    B) 2.39E5 J
    (this multiple choice question has been scrambled)
  7. Suppose an electron falls from n=4 to its ground state, n=1. Which of the following effects is most likely?
    A) the electron gains velocity
    B) the electron loses velocity
    C) a photon is emitted
    D) a photon is absorbed
    C) a photon is emitted
    (this multiple choice question has been scrambled)
  8. Which of the following compounds is not a possible isotope of carbon?
    A) 6C
    B) 12C
    C) 13C
    D) 14C
    A) 6C
    (this multiple choice question has been scrambled)
  9. According to the Heisenberg uncertainty principle, which of the following properties of a particle can an observer measure simultaneously?
    A) position and momentum
    B) position and velocity
    C) position, momentum and velocity
    D) momentum and velocity
    D) momentum and velocity
    (this multiple choice question has been scrambled)
  10. Which of the following electronic transitions would result in the greatest gain in energy for a single hydrogen electron, assuming that its ground state is n=1?
    A) an electron moves from n=3 to n=4
    B) an electron moves from n=6 to n=2
    C) an electron moves from n=2 to n=6
    D) an electron moves from n=4 to n=3
    C) an electron moves from n=2 to n=6
    (this multiple choice question has been scrambled)
  11. Suppose that a chemical species fills its orbitals as shown.
    3s: ⇅
    3p: ↑↑↑
    This compound could be said to obey which of the following laws of atomic physics?
    A) Hund's rule
    B) Heisenburg uncertainty principle
    C) Pauli exclusion principle
    D) Bohr's model
    A) Hund's rule
    (this multiple choice question has been scrambled)
  12. How many total electrons are in a 133Cs cation?
    A) 133
    B) 78
    C) 54
    D) 55
    C) 54
    (this multiple choice question has been scrambled)
  13. The atomic mass of hydrogen is 1.008amu. What is the percent composition of hydrogen by isotope, assuming that hydrogen's only isotopes are 1H and 2D?
    A) 99.992% H, 0.008% D
    B) 99.92% H, 0.08% D
    C) 99.2% H, 0.8% D
    D) 92% H, 8% D
    C) 99.2% H, 0.8% D
    (this multiple choice question has been scrambled)
  14. Consider the two sets of quantum numbers shown in the table, which describes two different electrons in the same atom.
    n     l     ml     ms
    2     1     1     +1/2
    3     1     -1    +1/2
    Which of the following terms best describes these two electrons?
    A) parallel
    B) antiparallel
    C) paired
    D) opposite
    A) parallel
    (this multiple choice question has been scrambled)
  15. Which of the following species is represented by the electron configuration 1s22s22p63s23p64s13d5?
    A) Fe2+
    B) Mn+
    C) Cr
    D) Cr and Mn+
    D) Cr and Mn+
    (this multiple choice question has been scrambled)
  16. Which of the following statements is NOT true of an electron's ground state?
    A) the electron is static
    B) the electron is at its lowest possible energy level
    C) the electron is in a quantized energy level
    D) the electron is traveling along its smallest possible orbital radius
    A) the electron is static
    (this multiple choice question has been scrambled)
  17. Which of the following experimental conditions would NOT excite an electron out of the ground state?
    A) high temperature
    B) radiation
    C) high pressure
    d) none of the above
    C) high pressure
    (this multiple choice question has been scrambled)
  18. Lithium and Sodium have similar chemical properties. For example, both can form ionic bonds with chloride. Which of the following best explains this similarity?
    A) lithium and sodium are in the same group of the periodic table
    B) both lithium and sodium ions are positively charged
    C) both lithium and sodium have low atomic weights
    D) lithium and sodium are in the same period of the periodic table
    A) lithium and sodium are in the same group of the periodic table
    (this multiple choice question has been scrambled)
  19. Carbon and silicon, elements used as the basic of biological life and synthetic computing, respectively, have some similar chemical properties. Which of the following describes a difference between the two elements?
    A) silicon has fewer valence electrons than carbon
    B) silicon has a smaller atomic radius than carbon
    C) carbon has fewer valence electrons than silicon
    D) carbon has a smaller atomic radius than silicon
    D) carbon has a smaller atomic radius than silicon
    (this multiple choice question has been scrambled)
  20. What determines the length of an element's atomic radius?
    A) the number of valence electrons
    B) the number of electron shells
    C) the number of valence electrons, the number of electron shells and the number of neurons in the nucleus
    D) the number of valence electrons and the number of electron shells
    D) the number of valence electrons and the number of electron shells
    (this multiple choice question has been scrambled)

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