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

Which change will increase both the rate of reaction and the extent (equilibrium yield) for an endothermic forward 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 a titration the concentration of acid in the burette is halved while the volume of alkali in the flask is kept the same. What happens to the volume of acid required to reach the end point?

For the equilibrium: H2(g) + I2(g) ? 2 HI(g), if extra H2 is added at constant temperature, which immediate change occurs?

Which experimental observation shows that increasing concentration affects the extent (equilibrium) rather than just the 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 statement about concentration and rate of reaction is FALSE?

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?

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

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

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