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Carl C.
B.S. Chemical Engineering, Nuclear Engineering Concentration
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Nuclear Physics
TutorMe
Question:

The binding energy per nucleon for Co-60, calculated from the liquid drop model, in MeV, is closest to?

Carl C.
Answer:

Knowing A=60 and Z=27, Use the semi-empirical mass formula. Where the coefficients are: a(V)=15.85MeV, a(S)=18.34 MeV, a(A)=23.21 MeV, a(C)=0.714 MeV, a(P)=12.00 MeV, and delta(o)=a(P)*A^(-1/2) In this case since the number of protons is odd, the pairing term becomes zero (delta(o))=0. The approximate binding energy using the SEMF is Eb=523.04MeV, the energy per nucleon is just Eb/A or 523.04/60=8.717 MeV.

Basic Chemistry
TutorMe
Question:

Given a molecule of water (H2O), what is the electron-pair geometry and molecular geometry of the molecule. Also, state the bond angle in degrees.

Carl C.
Answer:

Applying the VSEPR theory to the electrons and utilizing the shorthand "AXE method" of electron counting, we count there are 2 bonded atoms (Hydrogen) to the central atom (Oxygen). Knowing that Oxygen has 6 valance shell electrons and 1 will be used for each bond with each hydrogen atom, that leaves a total of 4 valance electrons floating around the oxygen atom (or two lone pairs). The AXE method gives H2O a notation of AX(2)E(2). With this notation we can look up the Electron and Molecular geometries. The electron geometry is that of a tetrahedral, while the molecular geometry is that of a bent structure. The approximate interaction between the two hydrogen atoms and the two lone pairs give rise to a bond angle of 109.5 degrees or in some literature 104.48 degrees.

Chemical Engineering
TutorMe
Question:

List and briefly define the three types of heat transfer and give an example of each.

Carl C.
Answer:

Convection-Movement of matter due to differences in density that are caused by temperature gradients Ex. Hot air transferring to a colder environment Conduction-Transfer of heat between atoms as they collide within a substance. Ex. Heating of a metal plate Radiation-Transfer of energy by EM waves Ex. Sunlight transferring heat to earth

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