Question

1) If the pI for a particular amino acid is 7.5, at which pH will the net charge on the molecule be zero?

2) Calculate the pH of 0.00756 M HNO₃.

3) The isoelectric point of an amino acid is defined as:

a. the pH at which it exists in the basic form

b. the pH equals the pKa

c. the pH at which it exists in the acidic form

d. the pH at which the amino acid exits in the zwitterion form

4) Given the following reaction, the equilibrium expression will be:
4 CuO (s) + CH₄ (g) ↔ CO₂ (g) + 4 Cu (s) + 2 H₂O (g)

a. [Cu]⁴/[CuO]⁴

b. [CuO]⁴/[Cu]⁴

c. [CO₂][H₂O]²/[CH₄]

d. [CuO]/[Cu]

The following reaction is exothermic. Which of the following will drive the reaction to the right (towards products)?
CH₄ (g) + 2 O₂ (g) ↔ CO₂ (g) + 2 H₂O (g)

a. An increase in temperature

b. A decrease in temperature

c. The addition of CO₂

d. The removal of CH₄

Answer 1