What is the formula of the compound? What is the structure of the complex ion present? (Hints: Cr3 is expected to be sixcoordinate, with NH3 and possibly I as ligands. The freezing point of water was lowered by 0.64C when 0.601 g compound A was dissolved in 10.00 g H2O (Kf 1.86C kg/mol).
Compound A was found to contain 73.53% iodine by mass. In a second experiment it took 32.93 mL of 0.100 M HCl to titrate completely the NH3 present in 0.341 g compound A. When 0.105 g of compound A was strongly heated in excess O2, 0.0203 g CrO3 was formed. A solid is isolated (compound A), and the following data are collected: i. The answer to “Ammonia and potassium iodide solutions are added to an aqueous solution of Cr(NO3)3. Long linear molecules tend to have stronger dispersion forces than short, branched ones o Increased dispersion forces correlates with increased molecular weight because larger atoms have larger electron clouds, and it’s easier to polarize molecules with larger numbers of electrons Induced dipole-induced dipole: Dipole-induced dipole Dipole-Dipole o Molecules that have permanent dipoles are attracted to each other (only applicable for polar molecules) The positive end of one is attracted to the negative end of the other, and vice versa These forces are only important when the molecules are close to each other Ion dipole o Important in solutionsĬhemistry was written by and is associated to the ISBN: 9780547125329. Intermolecular forces Intra: Attractions within a molecule between atoms Inter: Attractions between molecules, not nearly as strong as intramolecular forces (which hold compounds together) Types of Intermolecular Forces London Dispersion Forces o Between every molecule, temporary dipoles form between polar and non- polar molecules o Tendency of an electron cloud to distort in this way is called polarizability o Shape of the molecule affects the strength of dispersion forces. Substances in order from most to least dense: He Pentanol Glycerol (more dense because it has more hydrogen bonding than pentanol) Ag Intermolecular vs.