Which of the following best defines work? Choose one: A. The study of the relationship between chemical reactions and changes in energy B. The energy transferred between objects because of a difference in their temperature C. The energy required to move an object through a given distance D. The chemical equation of a reaction that includes energy as a reactant or a product

correct option: C

Explanation:

work is the energy required to move an object even in case of piston cylinder case work is calculated which is done by motion of pitson.

Work is defined as by the system on its surroundings as negative

work is not state funcion it is a path funcion and different for different path.

if there is no movement in the direction of the force means no work done by force in that dirrection.

hence opion c is correct

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

2b2t

explanation:

2b2t