Which situation is in equilibrium ?

True

Explanation:

Equilibrium exists when there are no remaining opportunities for individuals to make themselves better off. In this case, equilibrium will be reached once the students divide themselves between both classrooms and all of them are able to sit on chairs and see the chalkboard.

D) The amount of air in a room never changes.

Explanation: Equilibrium is defined as the state in which the concentration of reactants and products is constant or the rate of forward direction is equal to the rate of backward direction.

The amount of money in a bank account never changes.

Explanation: Equilibrium is a point where the supply and demand are perfectly equal. Once that is reached in your bank account, if you never touch the funds in there, or the stay the same with money coming in or out, you will be able to keep your bank account at equilibrium.

D) The amount of air in a room never changes.

Explanation: Equilibrium is defined as the state in which the concentration of reactants and products is constant or the rate of forward direction is equal to the rate of backward direction.

a) The percentage of nitrogen gas in a room decreases steadily: the amount decreases that means the reaction is taking place in one direction and hence the reaction is not in equilibrium.

b) A blade of grass grows taller : the plant gets taller that means the reaction is taking place in one direction and hence the reaction is not in equilibrium.

c) The amount of water in a cup decreases as it evaporates: The amount of water is decreasing that means the reaction is taking place in one direction and hence the reaction is not in equilibrium.

d) The amount of air in a room never changes: the amount of air does not change as the amount of air leaving the room is same as that of the air entering the room and hence the  reaction is in equilibrium.

d

Explanation: