(a)[1]
Deduce how long it took from the start of the experiment to gather 30 cm$^3$ of hydrogen gas.
(b)[2]
Plot a line on the grid to show the way the hydrogen gas volume varies with time.
(c)[2]
Describe the effect each of the following has on the rate of reaction of zinc with dilute hydrochloric acid. Keep every other condition the same. • The reaction is carried out at a lower temperature. • The reaction is carried out using zinc powder rather than small pieces of zinc.
(d)[1]
Calculate the mass of zinc required to make 96 cm$^3$ of hydrogen gas.
(e)[2]
Describe the observations when a small amount of aqueous ammonia is added and when a larger excess of aqueous ammonia is added. a small amount of aqueous ammonia a larger excess of aqueous ammonia