Amixture is -
a. a chemical combination of two or more different materials.
b. a physical combination of two or more different materials.
c. a precipitate and its solution.
d. a single element.

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

Why do the strengths of london (dispersion) forces generally increase with increasing molecular size? choose one: a. heavier atoms have stronger attractions for each other than lighter atoms. b. dispersion forces are all equal in magnitude; there is no size dependence. c. dispersion forces arise from the attraction between the nuclei of atoms, and larger molecules have larger nuclei. d. dispersion forces arise from dipoles caused by the electron distribution being distorted. larger molecules have more electrons and, therefore, more distortions and a bigger force. e. dispersion forces depend on distance. larger molecules are farther apart and so the forces are smaller.

Describe the hybridization of each carbon and nitrogen atom in each of the following structures