Chemistry MID TERM

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Chemistry MID TERM
2011-10-10 19:53:19

Chemistry Mid Term
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  1. A chemical can be defined as
    any substance that has a definite composition
  2. Which of the following is an extensive property of matter?
  3. Which of the following is an intensive property of matter?
  4. A measure of the quantity of matter is
  5. Matter includes all the following except
  6. A chemical change occurs when
    a leaf changes color in the fall
  7. Nirtogen monoxide and oxygen, both colorless gases, form a red-brown gas when mixed. Nitrogen monoxide and oxygen are called
  8. A solid substance is
    always the same shape regarless of its container
  9. What happens to the energy in a substance when it changes state?
    it changes from, but is neither destroyed nor increased
  10. Which of the follwoing is an example of a heterogeneous mixture?
  11. Which of the following is an example of a homogenous mixture?
  12. All known chemical elements are organized into groups based on similar chemical properties
    periodic chart
  13. A team of scientists is working to discover how an enzyme affects clood cells in sheep. They are working in the field of _____ chemistry
  14. Which of these statements does not describe a measurement standard?
    A standard can be easily changed to suit the experiment
  15. The standard base unit for mass is the
  16. Dalton incorporated the law of conservation of mass into his atomic theory by asserting that
    atoms of different elements have different properties
  17. The principles of atomic theory recognized today were conceived by
  18. The most common from of hydrogen has
    no neutrons
  19. The energy of a photon is related to its
  20. According to the Bohr model of the atom, the single electron of a hydrogen atom circles the nucleus
  21. All of the following describe the Heisenberg uncertainty principle except
    it helps to locate an electron in an atom
  22. An orbital that can never exist according to the quantam description of the atom is
  23. How many electrons are needed to completely fill the third main energy level if it already contains 8 electrons?
  24. The statement that an electron occupies the lowest available energy orbital is
    the Aufbau principle
  25. The statement that no two electrons in the same atom can have the same four quantam number is
    the Pauli exclusion principle
  26. Which of the following rules requires that each of the p orbitals at a particular energy level receive one electron before any of them can have two electrons
    Hund's rule
  27. An element with 8 electrons in its highes main energy level
    noble gas
  28. The size and shape of an electron cloud are most closely related to the electron's
  29. The idea of arranging the elemtents in the periodic table according to their chemical and physical properties is attributed to
  30. The periodic table
    was completed with the discovery of the noble gases.
  31. A horizontal row of blocks in the periodic table is called a
  32. When an electron is added to a neutral atom, a certain amount of energy is
    either released or absorbed
  33. The energy required to remove an electron from an atomis the atom's
    electron energy
  34. When an electron is acquired by a neutral atom, the energy change is called
    electron affinity
  35. In the alkaline-earth group, atoms with the smallest radii
    have the greatest ionization energies
  36. What are the diatomic elements?
    hydrogen, oxygen, flourine, nitrogen, bromine, chlorine, and iodine