Lecture 4 Notes d

Lecture 4 Notes d - Lecture 4 Guide September 5 See...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 4 Guide September 5 See Readings, Vocabulary and Activities for Chapter 3 Water – (H 2 O) Biological Importance a. Living cells are 70-95% H20 b. Solvent for biological reactions c. 71% of the earth’s surface is covered by H2O Fig 3.2 Hydrogen bonds between water molecules produces cohesion. Water molecule Polar covalent bonds Hydrogen bonds Some Important Properties Of H2O a. High specific heat – 1 cal/g/High specific heat – 1 cal/g/ ˚C (stabilizes temperatures) b. High heat of vaporization – 580 cal/g (produces evaporative cooling) c. Maximum density at 4 C (ecological importance for organisms living in aquatic habitats) This is because: when water is in ice, the molecules are at their greatest distance from each other. When it is heated, the crystal collapses in liquid, and density increases. Heating causes motion in liquid, density decreases ˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚˚ Solutions - A homogenous mixture consisting of a solvent , and solute(s) Water is an excellent solvent for ionic or polar molecules (see Figs. 3.6 and 3.7) Solute Concentration in Aqueous Solutions Concentration = mass (weight)/volume a. In reactions, molecules combine by number
Background image of page 1

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

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/09/2010 for the course BIOL 1201 taught by Professor Wishtichusen during the Spring '07 term at LSU.

Page1 / 5

Lecture 4 Notes d - Lecture 4 Guide September 5 See...

This preview shows document pages 1 - 2. Sign up to view the full document.

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