ch.2 water: a vital compound Flashcards
water: polar or not and why?
=highly polar because the electronegativity of O is much greater than that of H
hydrogen bonds
=arrangement of partial charges allows water molecules to interact forming weak chemical associations… hydrogen bonds.
-not limited to water molecules
-any molecules with H attached to a more electronegative atom (usually oxygen or nitrogen) can form a H bond.
cohesion
-the hydrogen bonding of water means that water molecules are attracted to one another– water is cohesive.
-hydrogen bonds hold water molecules together
high specific heat
-hydrogen bonds absorb heat when they break and release heat when they form, minimizing temperature changes
high heat of vaporization
=many hydrogen bonds must be broken for water to evaporate
Lower density of ice
water molecules in an ice crystal are spaced relatively far apart because of hydrogen bonding
Solubility
=polar water molecules are attracted to ions and polar compounds, making these compounds soluble.
Solubility
=polar water molecules are attracted to ions and polar compounds, making these compounds soluble.
surface tension
cohesion of liquid water is also responsible for its surface tension.
adhesion
when the polarity of water causes it to be attracted to other polar molecules as well is called adhesion.
