Chemistry Of Life Flashcards
Matter:
Takes up space and has mass
Elements:
Periodic table, 92 in nature
Compounds
Substance with 2 or more diff elements with define ratio
What % of natural elements are essential?
25%, meairy they are a must for life
How many essential elements do plants humans need?
P:17 h:25
What are dominant essential elements
0, c, h, N
CA, p, K, S
Trace elements
Also essential but only in small amounts
Isotopes
Same proton, diff neutron
3 types of intramolecular bones
1, non-polar covalent
2. Polar covalent
③ ionic
Ionic bonds
Electro static between metal cation and non-metal anion
Greater than 1.7
Dissociate in polar like water
Ions carry charges and can conduct electricity
Covalent bunds
2 non metals, share pair of valence E
Less than 1.7
How does en work?
En ≠ 0 then bond is polar covalent
Closer to 1.7 the more polar
Polar covalent have unequal e sharing
Hydrophilic and hydrophobic of bonds (polar, nonpolar, ionic)
Hydrophilic: polar and ionic
Hydrophobic: non- polar
Formation of hydrogen bunds
Intermolecular
O, N F
High en difference
Reversible reactions
Eventually occur at same rateproducts and reactants stop changing:chemical equilibrium