a. What can change the value of Kc
Only temperature can change the value of Kc
b. The reaction must be at ____________ for the value of Kc to be calculated
The reaction must be at equilibrium for the value of Kc to be calculated
c. Define the term homogeneous
A homogeneous reaction is when all reactants and products are all at the same state(either gas, ligiud or aqueous (solid and solid ae less likely to react with each other)). If the reactants and products are not at the same state then it's a heterogenous reaction.
Extra Notes
The Kc can only be calculated when the reaction is at its equilibrium and it's a homogenous reaction.
Same experiment with same constant temperature can have different value of Kc due to the uncertainty of the apparatus use.
Rules for the unit of Kc:
Each terms have the unit of mol/dm3. If there is the same number of terms on the numerator and denominator then the unit cancel out. If there is 1 more term on the numerator then the unit is mol/dm3. Basically we can work out the unit by looking at the amount of terms in the numerator and denominator and subtract them.
Equilibrium constant expression:
Concentration of product is always the numerator (on top) and concentration of reactant is the denominator (at the bottom)
Each concentration is rasied to the power of its coefficient in the balance equation (the moles in the balance equation)
If there is more than 1 products or reactants. The terms are multiplied by each other.
General formula:
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