CHEM 110 FINAL

Which of the following will shift the equilibrium position of the reaction to the right? N₂(g) + 3H₂(g) ⇌ 2NH₃(g), ∆H = -92.4 kJ

• Increase temperature

• Remove NH₃

• Add N₂

• Add a catalyst

What is the expression for the equilibrium constant, Kc, for the reaction: 2NO₂(g) ⇌ N₂O₄(g)

• [NO₂]²/[N₂O₄]

• [N₂O₄]/[NO₂]²

• [NO₂]/[N₂O₄]²

• 1/[NO₂][N₂O₄]

If K = 1.2 × 10⁻⁵ for a reaction, which direction is favored at equilibrium?

• Forward

• Reverse

• Both equally

• Depends on temperature

When Q > K for a reaction,

• The reaction is at equilibrium

• The forward reaction will proceed

• The reverse reaction will proceed

• No reaction will occur

Which of the following is a weak acid?

• HCl

• H₂SO₄

• CH₃COOH

• HNO₃

What is the pH of a 0.001 M HCl solution?

• 1

• 2

• 3

• 4

A buffer solution is best prepared using:

• Strong acid and its conjugate base

• Weak acid and its conjugate base

• Strong base and strong acid

• Weak base and strong acid

A solution has a pH of 9. What is its [H⁺]?

• 1 × 10⁻⁹ M

• 1 × 10⁻⁵ M

• 9 M

• 1 × 10¹ M

If Ka = 1.8 × 10⁻⁵, what is pKa?

• 5.74

• 3.14

• 4.74

• 6.32

Which of the following conditions always means a reaction is spontaneous?

• ∆H < 0, ∆S > 0

• ∆G < 0

• ∆G = 0