The Effect Of Changing Concentration (ht Only) (GCSE Chemistry)

Which change will increase the rate of a reaction but will NOT change the equilibrium position?

Which statement about concentration and rate of reaction is FALSE?

A 0.100 mol/dm3 solution of hydrochloric acid is diluted by adding an equal volume of water. Which statement about the concentration and the rate of a reaction of this acid with excess marble (CaCO3) is correct?

In the reaction H2O(l) ? H+(aq) + OH–(aq), what happens to the position of equilibrium and to the concentration of H+ when extra H+ is added?

A student measures initial rate for A ? products at three concentrations: [A] = 0.10 ? rate 0.020; [A] = 0.20 ? rate 0.040. What is the order with respect to A?

A student measures initial rates for the reaction A + B ? products and finds doubling [A] doubles the rate while doubling [B] has no effect. What is the simplest rate equation consistent with these observations?

Which of the following is an EFFECT of increasing concentration of reactants in a gas-phase equilibrium (at constant temperature) for an exothermic forward reaction where total gas moles decrease?

For the equilibrium N2(g) + 3 H2(g) ? 2 NH3(g) (exothermic forward), which change will shift the equilibrium to produce more ammonia at constant temperature?

In the reaction 2 NO(g) + O2(g) ? 2 NO2(g) the forward reaction is exothermic. What is the effect on equilibrium yield of NO2 if temperature is decreased?

Which change will increase the extent of a reaction (yield of products) for an exothermic reaction at equilibrium according to Le Chatelier’s principle?

In the reversible reaction A + B ? C + D at equilibrium, what is the effect of adding more B?