The density of copper decreases as temperature increases (as does the density of most substances). which change occurs in a sample of copper when it is warmed from room temperature to 95 °c?
(a) the sample will become lighter.
(b) the sample will become heavier.
(c) the sample will expand.
(d) the sample will contract.

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.