What happens to the concentration of both components in the system as volume decreases? n2o4(g) 2no2(g) both increase no2 less; n2o4 greater no2 greater; n2o4 less both decrease

According to Le Chatelier's principle when a system at equilibrium is subjected to changes in temperature, pressure, volume then the equilibrium will shift in a direction to counteract the induced change.

The given equilibrium is:

N2O4(g) ↔ 2NO2(g)

Since Volume (V) is inversely related to the pressure (P), a decrease in V will cause an increase in P. Based on Le Chatelier's principle, the equilibrium will now shift to the direction of lower pressure i.e. towards the reactants (since the # moles of reactants is less than the products). As a result concentration of N2O4 will increase and that of NO2 will decrease.

Ans: B

NO2 less, N2O4 greater

  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-