POC: Quiz 3

Which of the statements below are true about the definitions of ACID according to Arrhenius, Bonsted-Lowry and Lewis.

I. proton acceptor   

II. electron-pair donor

III. proton donor

IV. electron-pair acceptor

•  I and II

• I and IV

• II and III

• III and IV

Which of the following species is the conjugate acid for CH₃NH₂?

• CH₃NH₃⁺

• CH₃NH⁺

• CH₃NH^-

• CH₃NH₂^-

Which of the following salts produces a solution with pH greater than 7 when it is dissolved in water?

• Sodium Chloride

• Ammonium Chloride

• Sodium carbonate

• Potassium bromide

Which of these examples below are STRONG ACIDS?

I.   H₂SO₄

II. HClO₄

III. HSO₄^-

IV. HF

•  I and II

• I and IV

•  II and III

• III and IV

A typical blood sample has a pH of 7.4. What is its hydrogen ion concentration?

• 5.98 × 10^-5 M

• 2.98 × 10^-6 M

• 3.98 × 10^-8 M

• 4.98 × 10^-7 M

What is the pH of 0.035 M LiOH?

• 1.46

• 7.52

• 8.43

• 12.54

The acid dissociation constant of HF is 7.0 × 10^-4. Determine K_b for its conjugate base F^-.

• 1.7 × 10^-11

• 1.4 × 10^-11

• 1.4 × 10^-10

• 1.7 × 10^-9

Which of these are true about a buffer solution?

I.  made up of a mixture of weak base and salt of its conjugate acid

II. made up of a mixture of strong acid and salt of its conjugate base

III. resist changes in pH with addition of base only

IV. resist changes in pH with addition of acid or base

• I and II

• I and IV

• II and III

• III and IV

According to the VSEPR theory, if there are five electrons domains in the valence shell of an atom, they will be arranged in a ____ geometry.

• Seesaw

• trigonal pyramidal

• trigonal bipyramidal

• Octahedral

What is the electron domain geometry of OCl₂?

• Tetrahedral

• Trigonal pyramidal

• Angular/bent

• Trigonal planar