The Position of Equilibrium Flashcards

All 5 cards in this deck

Which way does the position of equilibrium shift when the temperature is decreased?

e.g. $\mathrm{N_2 + 3H_2 \rightleftharpoons 2NH_3}$, forward reaction exothermic

In the exothermic direction, to oppose the temperature reduction.

e.g. it moves to the right, towards ammonia, increasing the yield.

Which way does the position of equilibrium shift when the pressure is increased?

e.g. $\mathrm{N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)}$

Towards the side with fewer molecules of gas.

e.g. 4 molecules on the left, 2 on the right, so it moves right towards ammonia.

Which way does the position of equilibrium shift when the concentration of a reactant is decreased?

e.g. chloride ions removed from: pale blue solution + chloride ions ⇌ yellow solution + water

To the left-hand side, towards the reactants.

e.g. the mixture turns blue.

True or false? Adding a catalyst increases the yield of product at equilibrium.

False. A catalyst does not change the position of equilibrium; it only makes equilibrium be reached faster.

Which equilibria have their position changed by a change in pressure?

Only those involving gases, where the two sides have different numbers of gas molecules.