A: calcium
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The diagram shows the electrolysis of a concentrated aqueous solution containing both copper(II) ions and sodium ions…
The diagram shows the apparatus used to electrolyse lead(II) bromide using inert electrodes. Why does the lamp light …
The diagram shows the electrolysis of molten lead(II) bromide using inert electrodes. What happens during this electr…
An ion X⁺ has 23 nucleons and 10 electrons. What does the nucleus of X contain?
Which element exists as a macromolecule?
Which substance can conduct electricity by the movement of ions?