Interactions of Molecules (Unit 1)

Question 1

Many biological processes rely on…

Answer 1

interactions between molecules

Question 2

Biochemistry

Answer 2

Study of properties and interactions of biologically important molecules

Question 3

Types of Interactions

Answer 3

Intramolecular and Intermolecular

Question 4

Intramolecular Interactions

Answer 4

Interactions within a molecule; how atoms form bonds

Intermolecular forces hold molecules together in a molecule or compound

Question 5

Intramolecular interactions are driven by

Answer 5

Valencies (how many bonds an atom can form)

Difference in Electronegativity between atoms

Question 6

Electronegativity

Answer 6

Measure of the atoms ability to attract electrons

Question 7

High Electronegativity

Answer 7

Strong attraction for electrons. These atoms are more apt to gain electrons

Question 8

Low Electronegativity

Answer 8

Weak attraction for electrons. These atoms tend to lose electrons

Question 9

Types of Bonds Between Atoms

Answer 9

Ionic Bonding and Covalent Bonding

Question 10

Ionic Bonding

Answer 10

Metal atom with low EN, loses electrons to achieve a full outer shell to become a positive ion. Nonmetal atom with high EN gains electrons to achieve a full outer shell to become a negative ion. Positive and negative ions attract so strongly that an ionic bond forms.

Question 11

Covalent Bonding

Answer 11

Occurs between nonmetal atoms. Both need to gain electrons, so share 1, 2, or 3, pairs may be shared between atoms to form single, double, or triple bonds.

Question 12

Types of Covalent Bonds

Answer 12

Polar Covalent and Nonpolar Covalent

Question 13

Polar Covalent

Answer 13

Electronegativities between atoms differ by greater than 0.5, as the more electronegative atom pulls electrons closer (becoming negative) while the other becomes positive

Question 14

Nonpolar Covalent

Answer 14

Little to no difference in electronegativities of atoms, as electrons are shared equally.