Recent content by mcbud

  1. M

    Elements that can be oxidizing AND reducing agents?

    Start from the definition of reducing and oxidizing agent, and if you understand why Fe2+ can be both a reducing and an oxidizing agent depending on the reaction, you can easily answer that question.
  2. M

    Wave function , robability density , probability contradiction?

    For the link, just copy the citation and ask your librarian to get the paper for you. Read the biography of Max Born and the Born rule to find out about the probability interpretation of the square of ψ.
  3. M

    Chemistry Chemistry: Molecular vs. Atomic Iodine

    It's not a trick question. I is an atom and I2 is a molecule.
  4. M

    Wave function , robability density , probability contradiction?

    ψ is not a path: it has no physical interpretation. ψ is a formula that is maximum at zero, because it contains a single exponential decaying function (decaying with the radius of the electron): http://panda.unm.edu/Courses/Finley/P262/Hydrogen/img81.gif About ψ2 vs the radial probability...
  5. M

    Wave function , robability density , probability contradiction?

    In the radial probability function, there is an extra r2 term that is multiplied by |ψ2|. So mathematically, it is zero at r=0. When you solve the equation, it turns out that a0 is where the maximum radial probability occurs for the 1s orbital. In general, ψ is a mathematical wave function, or...
  6. M

    How do atomic orbitals combine to form molecular orbitals?

    Going back to the original question, molecular orbitals by definition involve the whole molecule, and all electrons are involved in MO formation, both core and valence electrons. However, how these orbitals are formed depends on the relative energies of the atomic orbitals involved. For example...
  7. M

    Uncovering the Mystery of How Element Electron Numbers are Determined

    For the lines in the X-ray spectrum, yes. Moseley also correlated the L-alpha lines belonging to the L-series of the spectrum with atomic number and found good correlation. The L-alpha series represents the transition from a level 3 orbital to a level 2 orbital. The L-alpha lines are not as...
  8. M

    Uncovering the Mystery of How Element Electron Numbers are Determined

    Not quite. As you can see, the X-ray spectrum of an element has many bands, belonging to different energy level transitions. He found a nice correlation between the frequency of the most intense short-wavelength band of the X-ray spectrum (K-alpha line) of an element and its atomic number Z. The...
  9. M

    Uncovering the Mystery of How Element Electron Numbers are Determined

    Read Henri Moseley's biography in Wikipedia and you will find out how he was able to do it.
  10. M

    Sodium Hydroxide: Purpose & Substitute

    The stability and viscosity of gelatin depend on pH. It would be hard to estimate how much sodium hydroxide you will need without doing a whole bunch of stability and viscosity experiments as a function of pH to find out which combination will give you adequate gel viscosity with acceptable...
  11. M

    Why can the mixing of acids and bases be dangerous

    Also, depending on the base (and the acid as well), you can have products that can be unsafe and perhaps hazardous. For example, if you mix bleach (NaOCl, a base) with hydrochloric acid, you will generate chlorine gas, which is extremely toxic and irritating to the respiratory tract. NaClO +...
  12. M

    Daniell cell = a primary cell?

    As I understand it, the Daniell cell when using copper (II) and zinc (II) sulfate solutions are reversible if you apply an EMF greater than the voltage of the cell (EMF > 1.1 V). However, if the Daniell cell is made as the original cell (Zn electrode in sulfuric acid & CuSO4 solution on a copper...
  13. M

    Inorganic I - 8 Coordinate Complexes

    For a coordination number of 8, either a square antiprism (like the XeF82- and IF8- anions) or a dodecahedron (ZrO8) can be formed.
  14. M

    How to report mass spectroscopy and elemental analysis in the RSC style

    I think you just state that the 166 peak is an M-15 peak in parenthesis.
  15. M

    How to report mass spectroscopy and elemental analysis in the RSC style

    For the elementary analysis, the x and y in your case are the found values, while the a and b refer to the theoretical percentage (based on the empirical formula). For the mass spec analysis, the % refers to the relative intensity (relative abundance). The RSC guideline tells you to use the %...
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