Describe how a newton's cradle illustrates the conservation of energy. a) dropping the ball transfers the gravitational energy to the others causing the ball on the opposite side to swing up. b) swinging the ball into the others, transforms the endothermic energy causing the ball on the opposite side to swing up. c) impacting the ball into the others, fixes the exothermic energy to the balls causing the ball on the opposite side to swing up. d) as the ball drops and impacts the others, the energy is transferred through the balls causing the ball on the opposite side to swing up.

  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-

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