On heating, solid Group I nitrates break down and release a gas that will relight a glowing splint.
A student investigates how quickly four Group I nitrates decompose. Each nitrate is heated separately with a Bunsen burner, and the student times how long it takes for a glowing splint to relight for each one.
(a)[1]
Identify the gas that causes a glowing splint to relight.
(b)[2]
The amount of heat supplied by the Bunsen burner must be controlled.
Suggest two methods for keeping the heat supplied constant.
(c)[1]
Suggest one variable, involving the metal nitrate, that should be controlled.
(d(i))[2]
Use the table times to calculate an average time for each metal nitrate. Ignore any anomalous times. Enter your answers in the table.
(d(ii))[2]
Which metal nitrate decomposes the fastest? Use the table data to explain your response.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “oxygen” …