Which of the following characteristics of water is correct?
a. water has low heat vaporization
b. water contracts as it freezes
c. water is nonpolar and is attracted to nonpolar substances
d. water exhibits cohesion, the tendency to attach to other molecules
e. water spontaneously ionizes into hydrogen and hydroxide ions

I would say D. Water exhibits cohesion, the tendency to attach to other molecules.

Explanation:

A. Is wrong because water has a high heat vaporization

B. Is wrong because water expands when it freezes

C. Is wrong because water is polar, not nonpolar

D. Water does exhibit cohesion, water likes to stick to each other along with similar substances

E. Might also be right because when water self-ionizes it creates hydronium ions and hydroxide ions, so if you can choose multiple answers, choose this one too.

don't guess, because if you answer incorrectly, points are taken off. even if you don't finish, take your time. to study, use the sample questions. there is not much preparation to take the pre- tests.

ek = (m·v2) / 2

v - velocity of system after the collision

m = m1 + m2

ek = (m1 + m2) ·v2/2

ek = (200 + 250) ·2,32/2 = 450·5,29/2 = 1190,25 j