What is the purpose of the arrow in a chemical equation? A. It indicates the direction in which the reaction occurs.
В.
It separates the elements from the compounds.
с.
It indicates the direction of increase in the number of molecules.
OD.
It indicates the direction of heat movement in a reaction.

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.