8. Consider the molecule H2+ 3 , in which the three protons are arranged linearly. Let proton A be on the left, proton B be in the middle and proton C be on the right, with the distance between proton A and B the same as the distance between proton B and C. Here we will use the LCAO approach to construct the three lowest energy molecular orbitals. a. Write down the electronic Hamiltonian Hˆ elec. You may use the notation Kˆ e for the kinetic energy, but you must write down explicit forms for Ven and Vee.

Butadiene undergoes a reaction at a certain temperature in the gas phase as follows: 2c4h6(g) --> c8h12(g) the following data were collected for this reaction: time (min) [c4h6] (m) 0 0.36 15 0.30 30 0.25 48 0.19 75 0. determine the order of the reaction and the rate constant. 1st order and k = 4.3x10 -4 s-1 1st order and k = 2.3x10-4 s-1 2nd order and k = 4.3x10-4 s-1 2nd order and k = 2.3x10-4 s-1 zero and k = 4.3x10-4 s-1

Drive down any three characteristic of modern periodic table

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size