Electroplating Flashcards
Why do we use electroplating?
to prevent rusting
make the metal object look better
The metal object is connected to the negative electrode cathode (-)
To electroplate it
The electrolyte is
Aqueous copper sulfate
Write the half ionic equation occur at:
Cathode (-)
Cu2+ (aq) + 2e- = Cu (s)
Write the half ionic equation occur at
anode (+)
Cu (s) = Cu2+ (aq) + 2e-
Explain why you have to rotate the metal object during electroplating
For fair plating
Explain why the metal object must be very clean?
For fully plating
What is the name of the process when the metal objects are coated with other metals
Electroplating
The apparatus below was used to deposit a thin layer of chromium on a steel knife.
The knife was cleaned carefully and all grease removed before the process.
Suggest the electrode
Chromium
The apparatus below was used to deposit a thin layer of chromium on a steel knife.
The knife was cleaned carefully and all grease removed before the process.
Suggest the electrolyte
aqueous chromium sulfate
The apparatus below was used to deposit a thin layer of chromium on a steel knife.
The knife was cleaned carefully and all grease removed before the process.
Give two reasons why steel knives are coated with chromium
To prevent rusting
looks more attractive
A steel spoon can be coated in silver using electrolysis. The spoon must be very clean and free of grease.
One advantage of putting a thin layer of silver on the spoon
prevent rusting
A steel spoon can be coated in silver using electrolysis. The spoon must be very clean and free of grease.
One disadvantages if the spoon is used frequently
The layer will ware off
A steel spoon can be coated in silver using electrolysis. The spoon must be very clean and free of grease.
Identify the metal from which the electrode is made
Silver
