UNE chem 1011 midterm| 78 Questions | With Complete Solutions

The phase in which a substance exists depends on the relative extents of its- correct answer: Intermolecular forces and kinetic energies of its molecules van der Waals forces correct answer: a slight attraction that develops between the oppositely charged regions of nearby molecules Londen dispersion forces correct answer: attraction between two rapidly fluctuating, temporary dipoles; significant only when particles are very close together instantaneous dipole correct answer: a fleeting nonuniform distribution of electron density in a molecule without a permanent dipole The presence of this dipole can, in turn, distort the electrons of a neighboring atom or molecule, producing an induced dipole. correct answer: Instantaneous dipole Do larger/ heavier molecules or lighter/smaller molecules have stronger IMFs? correct answer: Larger/heavier The measure of how easy or difficult it is for another electrostatic charge (for example, a nearby ion or polar molecule) to distort a molecule's charge distribution (its electron cloud) is known as correct answer: Polarizability melting/boiling point (increases/decreases) with increasing size correct answer: Increases eIn a larger atom, the valence electrons are, on average, farther from the nuclei than in a smaller atom. Thus, they are less tightly held and can more correct answer: Easily form the temporary dipoles that produce the atteaction Greater surface area= stronger or weaker imfs? correct answer: