The period when a spacecraft is following a trajectory but is not using its engines is
free flight.
open flight.
assessable flight.
terminal flight.

The chemical equation below shows the reaction of sodium (na) and chlorine (cl) to form sodium chloride (nacl). 2na + cl2 → 2nacl in this equation, which of the following is a reactant? i. sodium ii. chlorine iii. sodium chloride