CHEM - Chemistry - QUIZ

Questions

1. 1When one mole of ammonia (NH3) is heated and 50% of it dissociates according to the equilibrium equation: 2NH3 (g) ⇌ N2 (g) + 3H2 (g), what is the total number of moles of gas present in the equilibrium mixture?
2. 2Based on the equilibrium system: Heat + Fe3+ (aq) + HSCN (l) ⇌ FeSCN2+ (aq) + H+ (aq), which of the following changes would cause the solution to become more pink (shifting the equilibrium to the left)?
3. 3Calculate the pH of a 0.0500 mol/L solution of barium hydroxide (Ba(OH)2), assuming complete dissociation.
4. 4In the Bronsted-Lowry model of acids and bases, which of the following pairs represents a conjugate acid-base pair for the reaction: HS- (aq) + CO3 2- (aq) ⇌ S 2- (aq) + HCO3- (aq)?
5. 5Which of the following substances will hydrolyse in water to produce a basic solution (pH > 7)?
6. 6Identify the strongest acid from the following list based on their acid dissociation constants (Ka):
7. 7