Question

Which statement best describes the direction of heat flow by conduction between two samples of the same material?
Heat flows from faster molecules to slower molecules when they are near.
Heat flows from faster molecules to slower molecules when they collide.
Heat flows from slower molecules to faster molecules when they are near.
Heat flows from slower molecules to faster molecules when they collide.

Answer 1

Heat flows from faster molecules to slower molecules when they collide.

Reason: Conduction transfers kinetic energy via molecular interactions/collisions (or microscopic interactions), so higher-temperature (faster) molecules give energy to lower-temperature (slower) ones until thermal equilibrium.