Thursday, April 28, 2011
Thurs-Day 2
Physics - we discussed the atom, its structure, and definitions of atomic mass, mass number (protons + neutrons), atomic number, etc.
We used these various terms to calculate the number of protons, electrons, and neutrons of a given isotope of an atom.
We then discussed nuclear FUSION, in which protons and neutrons bind together to form a nucleus.
In this process, some nuclear mass is lost and converted to energy, which is equal to the binding energy of the nucleus; in other words, the more nuclear mass lost, the more energy released, and the more tightly bound are the protons and neutrons in the nucleus.
Using Einstein's most famous equation, we calculate the nuclear binding energy or energy released via the fusion formation of a given nucleus, using the "mass defect" as the mass in E = mc2.
AP Chem - we saw two other uses of the Thermodynamic state function , H, enthalpy. We saw how to do a "Hess Law Diagram" in calculating the lattice energy of a salt; we also did problems in which bond enthalpies, i.e. bond dissociation energies are used to determine the delta H of a reaction. We just drew the structures, and all of the bonds, and then just added the bond dissociation energies (all positive) to the bond formation energies (the negative of the bond dissociation energies).
We also did the 1999 part I exam, the questions that we did not get to are for HW.
We used these various terms to calculate the number of protons, electrons, and neutrons of a given isotope of an atom.
We then discussed nuclear FUSION, in which protons and neutrons bind together to form a nucleus.
In this process, some nuclear mass is lost and converted to energy, which is equal to the binding energy of the nucleus; in other words, the more nuclear mass lost, the more energy released, and the more tightly bound are the protons and neutrons in the nucleus.
Using Einstein's most famous equation, we calculate the nuclear binding energy or energy released via the fusion formation of a given nucleus, using the "mass defect" as the mass in E = mc2.
AP Chem - we saw two other uses of the Thermodynamic state function , H, enthalpy. We saw how to do a "Hess Law Diagram" in calculating the lattice energy of a salt; we also did problems in which bond enthalpies, i.e. bond dissociation energies are used to determine the delta H of a reaction. We just drew the structures, and all of the bonds, and then just added the bond dissociation energies (all positive) to the bond formation energies (the negative of the bond dissociation energies).
We also did the 1999 part I exam, the questions that we did not get to are for HW.
# posted by C @ 5:37 PM 
