Water Flashcards
(52 cards)
Bond angle of water
104.5
Total number of H bonds possible
4
Cohesion
Like molecules bond together
Adhesion
Molecule bonds to different type of molecule
Surface tension
Resistance of surface to deformation
Total thermal energy
Total amount of kinetic energy of molecules in a substance
Temperature
Average kinetic energy of molecules in a substance
Heat
Thermal energy in transfer from one body of matter to another
Specific heat capacity
Heat absorbed or lost needed to change temperature of 1g of a substance by 1 degree C
Heat capacity of water
1cal/g C; high heat capacity helps resist temperature changes
Why does water have a high heat capacity and high heat of vaporization
Hydrogen bonds must be broken before temperature will rise or before vaporization
Why is solid water more dense than liquid water
Solid water always forms 4 H bonds whereas liquid water forms 3.2 H bonds
Solute
The substance being dissolved
Solvent
The substance in solution that does the dissolving
Versatile solvent
Many substances dissolve well in water
Aqueous solution
Solvent of solution is water
What is easily dissolved in water
Ionic compounds and polar molecules
Molecules (proteins) in water
Not broken apart but surrounded in water in hydration shell
Hydrophobic substances
Substances that do not dissolve in water (nonpolar)
Hydrophilic substances
Substances that dissolve in water (polar)
Colloid
Suspension of molecules in water with hydration shells
Molarity
Moles (mol)/ Volume (L)
pH
-log10[H+]
Acid
Increases [H+] in solution; H+ donor
