Chemistry AAMC Qpack

Question 1

What kind of bonds does solid nitrogen contain?

Answer 1

Only covalent bonds are found in solid nitrogen

Question 2

When a system becomes more ordered does the entropy increase or decrease?

Answer 2

Entropy decreases when a system becomes more ordered

Question 3

When a system becomes more ordered is delta S positive or negative

Answer 3

More ordered means that delta S is negative because entropy decreases

Question 4

What does the ideal gas law assume about molecular volumes and intermolecular forces?

Answer 4

The ideal gas law assumes that molecular volumes and intermolecular attractive forces are negligible

Question 5

What does the formation of a hydrogen bond require?

Answer 5

The formation of a hydrogen bond requires a hydrogen bond donor and a hydrogen bond acceptor

Question 6

What is considered a hydrogen bond donor?

Answer 6

A hydrogen bond donor is a molecule that has a hydrogen bound to a highly electronegative atom such as oxygen or nitrogen

Question 7

What is considered a hydrogen bond acceptor?

Answer 7

A hydrogen bond acceptor is an electronegative atom [Such as nitrogen or oxygen] with an available pair of electrons

Question 8

How is the pH of a solution defined?

formula

Answer 8

The pH of a solution is defined as the negative log of the concentration of H+
pH = -log [H+]

Question 9

How does a strong acid dissociate in water?

Answer 9

A strong acid completely dissociates in water

Question 10

What is the concentration of H+ ions in a strong acid solution?

Answer 10

The molarity of the H+ ions in solution is equal to the molarity (concnetration) of the strong acid

Question 11

When acid and conjugate base concentrations are equal the pH of the buffer is equal to?

Answer 11

When acid and conjugate base concentrations are equal the pH of the buffer is equal to the pKa of the acid

Question 12

Tautomerism

Answer 12

The migration of a hydrogen atom from an alpha carbon to an oxygen atom - tautomerism is the change in hybridization of the alpha carbon and the oxygen atom

Question 13

What is the volume of one mole of gas?

Answer 13

1 mole = 22.4 L

Question 14

A reducing agent ___ electrons

Answer 14

A reducing agent loses electrons

Question 15

An oxidizing agent ____ electrons

Answer 15

An oxidizing agent gains electrons -> oxidizing agents undergo reductions by gaining electrons

Question 16

Loss of an oxygen is a(n) ____ (oxidation or reduction)

Answer 16

loss of an oxygen is a reduction

Question 17

Gain of an oxygen is a(n) _____ (oxidation or reduction)

Answer 17

Gain of an oxygen is an oxidation