Last updated on Sep 20, 2026

Reaction Rates and Equilibrium (OCR A-Level Chemistry A): Flashcards

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The Equilibrium Constant Kc – Part 1

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What does $K_c$ measure?

Position of equilibrium quantitatively

Meaning of [ ] in equilibrium expressions

Concentration of (in $\text{mol dm}^{-3}$ )

What does large $K_c$ value indicate?

Products predominate at equilibrium

What does small $K_c$ value indicate?

Reactants predominate at equilibrium

General pattern for $K_c$ expression

Products over reactants, each raised to power from equation

Role of balancing numbers in $K_c$

They become powers/indices, not multiplication factors

$K_c = 1$ meaning

Equilibrium halfway; similar amounts of products & reactants

$K_c > 1$ meaning

Equilibrium lies towards products

$K_c < 1$ meaning

Equilibrium lies towards reactants

Which concentrations used in $K_c$ calculation?

Only equilibrium concentrations

Explore OCR A-Level Chemistry A Revision Notes by Topics

Periodicity

Reactivity Trends

Enthalpy