A-Level Chemistry Specification

OCR A H432

Section 5.1.2: How far?

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#5.1.2a

use of the terms mole fraction and partial pressure

See also 3.2.3 Chemical Equilibrium.

#5.1.2b

calculation of quantities present at equilibrium, given appropriate data

#5.1.2c

the techniques and procedures used to determine quantities present at equilibrium

Not for Kp.

#5.1.2d

expressions for Kc and Kp for homogeneous and heterogeneous equilibria (see also 3.2.3f)

Note: liquid and solid concentrations are constant and are omitted in heterogeneous Kc and Kp expressions.

#5.1.2e

calculations of Kc and Kp, or related quantities, including determination of units (see also 3.2.3f)

Learners will not be required to solve quadratic equations.

#5.1.2f

(i) the qualitative effect on equilibrium constants of changing temperature for exothermic and endothermic reactions

(ii) the constancy of equilibrium constants with changes in concentration, pressure or in the presence of a catalyst

#5.1.2g

explanation of how an equilibrium constant controls the position of equilibrium on changing concentration, pressure and temperature

#5.1.2h

application of the above principles in 5.1.2 for Kc, Kp to other equilibrium constants, where appropriate (see also 5.1.3c etc.).