midterm 1

Question 1

Strongest bond. Sharing a pair of electrons. energy must be used to break.

Answer 1

Covalent Bonds

Question 2

a charged group on one molecule attracting an oppositely charged group on another. energy is given by coulombs law (E=kq1q2/Dr). weak but in huge numbers. important for structure.

Answer 2

Electrostatic interactions

Question 3

E=Kq1q2/Dr

Answer 3

Coulombs law

Question 4

want is to be large. property of material something is in (ex water=80)

Answer 4

Dialectric constant ( the D in E=kq1q2/Dr)

Question 5

responsible for base pair interaction in DNA. important for secondary structures. an H atom is partially shared by electrons atoms (ex, N or O). responsible for properties of water. ionic interactions

Answer 5

Hydrogen bond

Question 6

the group that includes both the atom that the H atom is more tightly linked and the H itself.

Answer 6

hydrogen-bond donor

Question 7

the atom less tightly linked to a hydrogen atom in a hydrogen bond

Answer 7

hydrogen-bond acceptor

Question 8

partial + and - charges around atoms. too close=repulsion. very low strength but huge number (like velcro).

Answer 8

Van der waals interactions

Question 9

water is…

Answer 9

Polar, highly cohesive, hydrogen bonds with itself (really good at hydrogen bonding)

Question 10

distribution of charge is asymmetrical, has a dipole moment. electronegativity of atom is unequal. hydrophilic!!

Answer 10

Polar

Question 11

electronegativity of atom is equal. hydrophobic!!

Answer 11

Non-polar

Question 12

exergonic

Answer 12

negative. favourable. reaction will proceed.

Question 13

endogonic

Answer 13

positive. unfavourable.