Ateacher does a demonstration for her science class. she has two beakers that are each filled with 100 ml of colorless liquid. she also has two identical pieces of magnesium metal. she drops one piece of magnesium into beaker 1 and the other piece into beaker 2. which of the following observations would provide evidence that the beakers contain different substances?
a.
bubbling occurs around the magnesium in both beakers.
b.
bubbling occurs around the magnesium in beaker 1, but there is no visible change in beaker 2.
c.
the magnesium sinks to the bottom of both beakers, but the pieces land in different positions.
d.
there is no visible change in either beaker.

answer:

  j

explanation:

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.