The diagram shows a laboratory apparatus for comparing the electrical conductivity of graphite powder and powdered sulfur. Each powder is placed in the same...
Question 1 Report
The diagram shows a laboratory apparatus for comparing the electrical conductivity of graphite powder and powdered sulfur. Each powder is placed in the same box between two electrodes. A lamp is used to show whether current flows.
(a) Name the carbon allotrope that should make the lamp light. [1]
(b) What observation would show that sulfur does not conduct? [1]
(c) Suggest why graphite conducts but sulfur does not. [2]
(d) Give two variables that should be kept the same for a fair comparison. [2]
Answer Details
(a) graphite [1] (b) lamp remains off / no current reading [1] (c) graphite has delocalised electrons [1]; sulfur has no mobile charged particles/electrons [1] (d) any two: mass of powder [1]; distance between electrodes [1]; voltage [1]; size of box/electrodes [1]
Download The App On Google Playstore
Everything you need to excel in your exams
