Dry ice (solid ) sublimes directly to the gaseous phase at room temperature
CHEMISTRY · Single correct · CBSE · Chemistry · Is Matter Around Us Pure? · Is Matter Around Us Pure?
Problem
Dry ice (solid CO2) sublimes directly to the gaseous phase at room temperature. Which of the following best justifies why this change is considered physical rather than chemical?
(a) The mass of CO2 is conserved during the sublimation.
(b) Only intermolecular attractions between CO2 molecules are overcome; the covalent C–O bonds within each molecule remain intact.
(c) Energy is absorbed during sublimation, and energy absorption is characteristic of chemical reactions.
(d) The sublimation can be reversed easily, and any process that can be reversed must be physical.