Lecture 3 Water and its Properties

Lecture 3 Water and its Properties - 09/05/2007 Lecture 3:...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

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

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

Unformatted text preview: 09/05/2007 Lecture 3: Water and its Properties A. Essential to life 1. Humans are mostly water (70%-75%)- Cucumber or watermelon (90%-95% water) 2. Source oxygen- Water is a source of oxygen, breathing in oxygen, breathing out CO 2- In photosynthesis, waters (oxygens) function is to accept the electrons- In respiration, the terminal electron acceptor is oxygen a. Photosynthesis: oxygen- light will come and break it apart, oxygen is releases (water produces oxygen by way of photosynthesis) b. Respiration: the oxygen is used to accept the electrons when we breathe it in 3. Solvent- Water is a solvent, a lot of substances are attracted to water (hydrogen bonding)- Processing organic compounds: Break down proteins, build them up into our own proteins Hydrolysis - water is used to BREAK DOWN molecule Condensation BUILDING molecules back up (water forming) B. Cohesion- Surface Tension (fig. 2-15) Hydrogen has a slight positive charge and causes hydrogen bonds When water sticks to water, it is called cohesion Water striders press on the surface of the water, surface tension can support a small amount of weight because of hydrogen bonds C. Adhesion- Water binds to something other than water 1. Capillary Action (fig. 2-14)- Water rises because it is attraction to negative charge on sides of capillary- Cohesion holds water molecules together- Percolation (water filtering down through soil Water drains through clay, capillary action holds it in place- Trees water can travel from roots to branches through the trees cellulose tubes that act as capillary tubes Adhesion...
View Full Document

Page1 / 7

Lecture 3 Water and its Properties - 09/05/2007 Lecture 3:...

This preview shows document pages 1 - 3. Sign up to view the full document.

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