Equilibrium (GCSE Chemistry)

Which of the following best defines a catalyst?

A student measures the rate of a reaction by timing how long it takes to collect a fixed volume of gas. Which improvement gives more accurate temperature control and reduces heat loss in a calorimetry-style reaction?

Which of the following is the best practical test to show hydrogen gas is being produced in a reaction?

Which technique would a chemist use to demonstrate the effect of concentration on the position of equilibrium in a laboratory?

When ammonium nitrate dissolves in water the temperature of the solution falls. Which statement best describes this process?

Which change increases the extent (amount of product at equilibrium) for an exothermic forward reaction?

For the equilibrium 2 NO2(g) ? N2O4(g), which change would make the mixture turn a paler (less brown) colour?

Which experimental change increases the rate of reaction by increasing the frequency of successful collisions?

When teaching Le Chatelier’s principle, which correct summary should students learn?

In the context of rates, what is the main reason increasing concentration increases reaction rate?

When the temperature is increased for the equilibrium 2HI ? H2 + I2, the equilibrium shifts to the right. What does this tell you about the forward reaction?