The air bags that provide protection in autos in the event of an accident expand because of a rapid chemical reaction. The air bags give off heat when they expand. From the viewpoint of the chemical reactants as the system, what do you expect for the signs of q and w in this process?
Both the signs should be positive.
The sign of w should be positive, the sign of q should be negative.
The sign of q should be positive, the sign of w should be negative.
Both the signs should be negative.