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

Which combination will increase the yield of products for the reaction 2 A(g) ? B(g) (endothermic forward)?

A student performs titrations with a fixed volume of alkali and varying concentrations of acid. How does the concentration of acid affect the volume needed to neutralise the alkali?

During a titration the concentration of the titrant is halved. To obtain the same number of moles of titrant reacted you must:

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

A reaction A ? products is first order with respect to A. If the concentration of A is reduced to one quarter of its initial value, what happens to the initial rate?

A sealed container holds the equilibrium 2 NO2(g) ? N2O4(g). The mixture is brown (NO2). Which immediate observable effect occurs if the pressure is increased by reducing the container volume?

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

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?

Which experimental change would NOT affect the equilibrium position for a reaction in a closed vessel?

Which statement about concentration and rate of reaction is FALSE?

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?