1. (17 points) Based on the descriptions of the following molecular compounds (i) draw the best Lewis
structure, (ii) provide the central atom hybridization, and (iii) determine the molecular
geometry. In each case, the central atom is a main group element capable of forming polar-
covalent bonds with its bonding atoms.
(a) The unknown element, X, reacts with fluorine to produce XF4. The molecule experiences both
London-dispersion forces and dipole-dipole interactions in the condensed phase.
(b) The unknown element, Y, reacts with hydrogen to produce YH3. The gas-phase molecule does
not possess a permanent dipole moment.
(c) The unknown element, Z, reacts with fluorine and hydrogen to produce two products with the
chemical formula, ZF2H2. One product only experiences London-dispersion forces in the
condensed phase, the second experiences both London-dispersion forces and dipole-dipole
interactions in the condensed phase, and both products share the same electron domain
geometry. Draw and analyze both products!

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al

Write the balanced equation for a reaction between aqueous nitric acid (hno3) and solid lithium metal (this is a single replacement reaction)

Oxidation-reduction reactions (often called "redox" for short) are reactions that involve the transfer of electrons from one species to another. oxidation states, or oxidation numbers, allow chemists to keep track of these electron transfers. in general, one element will lose electrons (oxidation), with the result that it will increase in oxidation number, and another element will gain electrons (reduction), thereby decreasing in oxidation number. the species that is oxidized is called the reducing agent or reductant. the species that is reduced is called the oxidizing agent or oxidant. to sum up: oxidation = increase in oxidation state = loss of electrons = reducing agent reduction = decrease in oxidation state = gain of electrons = oxidizing agent part a which element is oxidized in this reaction? fe2o3+3co→2fe+3co2 enter the elemental symbol. view available hint(s) is oxidized part b which element is reduced in this reaction? 2hcl+2kmno4+3h2c2o4→6co2+2mno2+2kcl+4h2o enter the elemental symbol. view available hint(s) is reduced