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

A reaction is observed to have a linear increase in rate when [A] is doubled, but a quadratic increase when [B] is doubled. What is the overall order of the reaction?

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 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 statement about concentration and collision frequency is CORRECT?

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?

A weak acid and a strong acid have the same concentration. Which statement about their pH is correct?

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?

A student mixes excess magnesium with 0.10 mol/dm3 hydrochloric acid and measures the rate of hydrogen production. If the acid concentration is changed to 0.20 mol/dm3 (all else equal), which is the MOST reasonable expected result?

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

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?