Chpt_3_Water - Life on Earth Exists because of H2O 1. Cells...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Life on Earth Exists because of H 2 O 1. Cells are mostly water 70-95%. 2. 3/4 th of Earth’s surface is covered by water. 3. Water is a polar molecule: a.opposite ends of the molecule have opposite charges b.opposite charges attract the molecules to H-bond ( each H 2 O molecules can form H-bonds with at least 4 others) c.this accounts for the properties of water
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4. Properties of Water: a. Cohesion: Hydrogen bonds hold individual water molecules together it acts as one substance. (attraction that water has for itself) b. Adhesion: Clinging of water to another substance (the attraction that water has for other molecules) c. Surface Tension: (Is due to cohesion ) it is a measure of the force necessary to stretch or break the surface of a liquid. d. Specific Heat: The amount of heat that must be absorbed or lost for 1g of that substance to change its temperature by 1 0 C. 1. Heat is a measure of the total kinetic energy in a system. 2. Temperature measures the intensity of heat due to the
Background image of page 2
average kinetic energy in molecules. a. Temperature is measured on the Celsius scale (Celsius = C) -H 2 O freezes at 0 0 C -H 2 O boils at 100 0 C b. A calorie is a measure of heat. -
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/27/2011 for the course BSC 2 taught by Professor Oses during the Spring '11 term at Miami Dade College, Miami.

Page1 / 10

Chpt_3_Water - Life on Earth Exists because of H2O 1. Cells...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online