Water.pdf

Unusual phase change characteristics ice is less

This preview shows page 15 - 23 out of 28 pages.

Unusual phase change characteristics
Image of page 15

Subscribe to view the full document.

Ice is less dense than water Liquid water expands as it freezes because the hydrogen bonds joining the water molecules in the crystalline lattice This keeps the molecules far enough apart to give ice a density about 10% less than the density of liquid water The structure of ice is a regular open framework of water molecules in a hexagonal arrangement
Image of page 16
3) Cohesive and adhesive Cohesive the ability of water molecules to cling to each other due to hydrogen bonding. Adhesion the ability of water molecules to cling to other polar surfaces. Water is an excellent transport medium in both trees and humans . Capillary action is the tendency of water to move in narrow tubes, Contributes to the to the transport water against in a plant.
Image of page 17

Subscribe to view the full document.

Image of page 18
4) High surface tension The cohesion of its molecules produces a much greater attraction for each other than for molecules in the air. Caused by the hydrogen bonding between water molecules, which strong enough to support these water striders.
Image of page 19

Subscribe to view the full document.

Due to these properties mean that water can be used to transport substances within organisms. For instance, Blood plasma which is mostly water, transports a wide range of substances in solution around the body like nutrients (glucose , vitamin and amino acids) carbon dioxide, glucose & amino acids) and wastes (carbon dioxide). Urea (a nitrogenous excretory product in mammals) is transported out of the body in urine, in solution in water.
Image of page 20
Water Balance is crucial Living organisms try to ensure that the water balance is maintained in their cells and the concentration of solutes is held constant so the cells can function properly.
Image of page 21

Subscribe to view the full document.

5. Water is amphoteric it can act as an acid (H + ions) and a base (OH ).
Image of page 22
Image of page 23
  • Fall '19
  • Atom, 1 gram, Universal Solvent

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern