Which of the following statements best distinguishes a chemical change from a…
CHEMISTRY · Single correct · AP · Chemistry · Chemical Reactions · Chemical Reactions
Problem
Which of the following statements best distinguishes a chemical change from a physical change at the particulate level?
(a) Chemical changes are always accompanied by a change of state, whereas physical changes never involve phase transitions.
(b) Chemical changes require an input of heat energy to break bonds, whereas physical changes occur without any energy transfer.
(c) Chemical changes involve breaking and/or forming intramolecular bonds, whereas physical changes involve only changes in intermolecular forces.
(d) Chemical changes alter the total mass of the system because atoms are converted to energy, whereas physical changes conserve mass.