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

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

How does an increase in reactant concentration affect the equilibrium constant K for the reaction at a fixed temperature?

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

Which statement about concentration and collision frequency is CORRECT?

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?

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?

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?

In an experiment the student measures how long it takes to produce a fixed volume of product gas at different concentrations. Which graph best represents the relationship between concentration and time to produce that volume?

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 effect on an equilibrium is produced by removing some product as it forms (for a reaction aA ? bB)?

When the concentration of reactants is increased, which of the following best explains why the rate of a collision-controlled reaction increases?