Chemical equilibrium is described as being dynamic because:
the mass of the reactants changes to equal the mass of the products.
the concentration of the reactants changes to equal the mass of the products.
opposing reactions are constantly occurring at an equal rate.
it cannot be changed.

What do you need with it’s not a question your just stating what it says

The second and last option are the answers

Vander waals forces are inter molecular bonds that exist within molecules of the same substance. a water molecule is made up of oxygen and hydrogen atoms which share electrons between each other. the vander waals forces are forces that exist between multitude of different  molecules of water. dipole dipole forces is the type of vander waals force that exist in water. the oxygen atom which is more electronegative pulls the shared electron closer to itself thus generating a partial negative charge while the hydrogen acquire a partial positive charge. these two different charges causes attraction to occur in water molecules.

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