What has to happen in order for work to be done

Explanation:

For work to be done, force must be applied to move an object in the direction of the applied force.

Work is the product of force and distance. Workdone describes a change of energy between places.

If we apply force to a body without moving it through a distance, no work is done.

Work is only done when force is applied to move or displace a body.

If we only apply force and no movement occurs, no work is done..

The unit of force is Joules.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.