spring 2023 test

Question 1

It is not possible to have a pH lying outside the range of 0 to 14.

Answer 1

False

Question 2

For a diprotic Acid H2A relationship Ka1>Ka2 is always true.

Answer 2

True

Question 3

The higher the acid dissociation constant, Ka, the stronger is the acid.

Answer 3

True

Question 4

A buffer solution is made of a weak acid and its conjugate base or a weak base and conjugate acid.

Answer 4

true

Question 5

A buffer solution is a solution whose PH changes very little/slightly upon addition of acid or base.

Answer 5

False, will only change for an unbuffered solution.

Question 6

The higher the concentrations of a buffer components, the greater his capacity to resist pH changes.

Answer 6

True

Question 7

when two strands of DNA anneal according to Watson-crick base pairing, the result is a double strand of DNA.

Answer 7

True

Question 8

Hydrophobic effect is the result of nonpolar interaction

Answer 8

True. they don’t react with water molecules and have a long chain of carbons.