Chemical equilibrium results if all reactants are used up. some products are removed. more reactants are added. forward reaction rate equals reverse reaction rate

Chemical equilibrium results if FORWARD REACTION RATE EQUALS REVERSE REACTION RATE.

In chemical reaction, chemical equilibrium refers to the phase, when the concentration of both reactants and products are constant with no observable change with time. This phase is typically reached, when the rate of forward reaction is equal to the rate of reverse reaction. Arrows that are pointing both ways are usually used in chemistry to indicate equilibrium reactions, the arrows implies that the reaction can move both ways, both backward and forward.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.