Noncovalent Interactions Flashcards
electrostatic interactions between ions of opposite charges will attract or repeal?
Attract
an type of bond that attracts opposite charges of ions is called?
Ionic (ex: NaCl)
Define Covalent bonds
Same dielectric constant (big brain ans: the bonding electron pair is shared equally between the atoms)
When the electron pair is not shared equally between the atoms b/c one has a greater pull than the other it is called a ____ ____ bond?
Polar covalent bond (one with thr greater pull is partially neg and the other, weaker pull is partially pos)
A measure of an atoms affinity for electrons is the?
Electronegativity
What is the electronegativity of hydrogen (H)?
2.1
What is the electronegativity of phosphorus (P)?
2.1
What is the electronegativity of carbon (C)?
2.5
What is the electronegativity of sulfur (S)?
2.5
What is the electronegativity of iodine (I)?
2.5
What is the electronegativity of bromine (Br)?
2.8
What is the electronegativity of nitrogen (N)?
3.0
What is the electronegativity of chlorine (Cl)?
3.0
What is the electronegativity of oxygen (O)?
3.5
What is the electronegativity of fluorine (F)?
4.0
The bond is ionic if the change in EN is?
greater than or equal to 2
The bond is polar covalent if the change in EN is?
greater than or equal to 0.4 but less than or equal to 2
The bond is nonpolar covalent if the change in EN is?
less than or equal to 0.4
The ______ effect is the shifting of electrons in a bond in response to the
electronegativity differences between the atoms of the bond.
inductive
This optimal radius of interaction is
called the ___ ____ ____ radius
Van der Waals
The greater the electro negativity of the
donor group the _______ the H-bond
Stronger
The hydrogen bond consists of an
interaction between a covalently bonded _____ atom of the donor group and a nonbonding pair of
_____ of the acceptor group. The H-Bond acceptor must have a lone pair of nonbonding _______.
Hydrogen; electrons x2
In biomolecules, only __ and __ are electronegative enough to function as H-bond donors.
N & O
Hydrogen bond formation is not ____ ____ chemistry. The hydrogen always remains bonded to the oxygen or the nitrogen H-Bond donor and is not passed on to the acceptor
Acid Base
