Q2. (a) describe the differences in chemical bonding that can be used to distinguish a semi-bridging h2-co ligand from a symmetrical 12-co ligand? (5 marks) (b) explain why the v- o stretching frequency changes when bis(acetylacetonato)oxovanadium(iv) is dissolved in pyridine. (4 marks) (c) the interaction of na fe(co), with (ch3)2nch i gives the carbene complex (co) fechn(ch3)2. write a plausible reaction sequence. (8 marks)

What overall charge must all compounds have

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.

What is the area in square meters of 448 g ai foil that has a thickness of 23921 nm? the density is 2.70 g/cm