Question

question 1
a reaction quotient, $q_c$, can be expressed using ...... concentrations of the reactants and products.
...equilibrium...
...any...
... only initial...
...only final...

question 2
$q_p$ for gaseous reactions is calculated using:
molar concentrations.
partial pressures.
both molar concentrations and partial pressures.
neither molar concentrations nor partial pressures.

question 3
which one of the following sentences is true regarding the reaction quotient, $q_c$?
the value of $q_c$ is always less than $k_c$
the value of $q_c$ always remains constant
the value of $q_c$ is variable
the value of $q_c$ is always greater than $k_c$

Explanation:

• For Question 1: The reaction quotient $Q_c$ is calculated using the concentrations of reactants and products at any stage of the reaction, not just equilibrium, initial or final.
• For Question 2: $Q_p$ for gaseous reactions is calculated using the partial - pressures of the gaseous reactants and products.
• For Question 3: The value of $Q_c$ changes as the concentrations of reactants and products change during the course of a reaction, so it is variable.

Answer:

1. B. ...any...
2. B. Partial pressures.
3. C. The value of Qc is variable.