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Evaporation

AP Bio Lab 11

Subject: 
Biology
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Plant physiology
Transpiration
Stoma
Leaf
Evaporation
Transpiration stream
Photosynthesis system

AP Lab #11 Plant Transpiration August 18, 2014 PURPOSE: What factors, including environmental factors, affect the rate of transpiration? Background: Transpiration is the evaporation of water fom plants. It mostly occurs at the leaves through the stomata. It also pulls up water from the roots to supply photosynthesis, bring minerals up from the roots, and to cool the leaf. Hypothesis: If the plant is placed in front of a fan, then the rate of transpiration will increase If the plant is placed in light, then the rate of transpiration will increase. If the plant is placed in a moist area, then the rate of transpiration will decrease. If the plant is placed in the dark, then the rate of transpiration will decrease. MATERIALS & PROCEDURE:

Chapter 10

Subject: 
Chemistry
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Chemistry
Thermodynamic properties
Chemical engineering
Materials science
Phase transitions
Enthalpy
Enthalpy of vaporization
Vapor pressure
Phase
Enthalpy of fusion
Dipole
Evaporation

Chapter 10 notes Claire Rafson 10.1-10.2 Intermolecular forces- occur b/w not in molecules. From solid to liquid to gas molecules remain in tact Forces: Dipole-dipole forces are forces that act between polar molecules Hydrogen bonding- strong form of dipole dipole with H and NOF London Dispersion- Present in all but ionic . noble gas and nonpolar and Polar. Big atom with a lot electrons LD can be stronger than dipole dipole Higher IMF = higher: surface tension, boiling/meltin point. Lower: vapor pressure Capillary action- polar liquids typically exhibit it 10.3- crystalline solids- highly regular arrangement of their components ionic and molecular amorphous solids- considerable disorder 10.5- Network atomic Solids- giant molecule Strong covalent bonds Silica- SiO2
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