the chemistry of life chemistry is the foundation of biology
Post on 05-Jan-2016
229 Views
Preview:
TRANSCRIPT
The CHEMISTRY
of Life
CHEMISTRY is the foundation of
BIOLOGY.
Elements in the same column have the same valence & similar
chemical properties
REACTIVITY•Atoms tend to• complete a partially filled valence shell or• empty a partially filled valence shell
––
–
REACTION (Bond formation)
Biological Bonds
–
–
H2 (hydrogen gas)
Biological systems are composed of primarily non-metals (CNOPSH)
Non-metals share electrons with each other to complete their valence shells
COVALENT
balanced, stable.Good building
block
Non-polarPolar
hydrocarbons = CxHx
Polar Bonds
oxygen has stronger “attraction” for the electrons than hydrogen
oxygen has higher electronegativity
H
H
Oxygen
Water is a polar molecule
+ vs – poles
+
+
–
–
––
Hydrogen Bonding
H bonds
H
O
H Between the “negative-ish”
oxygen
and
The ”positive-ish” hydrogen
WEAKThere is strength in numbers
top related