Use the information below to answer the following questions. An iron nail (Fe) is placed into a solution of copper sulfate (CuSO4). After some time, the blue color of the copper sulfate disappears and some copper-colored solid (Cu) is found on the surface of the nail. The solution now contains iron sulfate (FeSO4), and the container feels warmer than before the reaction. (Use ^ for the subscripts)

List the reactants (use the chemical symbols).
List the products (use the chemical symbols).
Identify the solvent.
Is this reactions exothermic or endothermic?
Is the blue color disappearing a sign of a physical or chemical change?

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.