5.8 Electroplating Flashcards Preview

GCSE Chemistry 2.5 Salts And Electrolysis > 5.8 Electroplating > Flashcards

Flashcards in 5.8 Electroplating Deck (11)
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1
Q

What 3 metals are most commonly used in electroplating?

A
  • gold
  • silver
  • chromium
2
Q

Name 4 reasons for electroplating

A
  • make the object more attractive
  • protect a metal from corroding
  • increase the hardness of the surface
  • reduce costs by using a thin layer of metal instead of the pure metal
3
Q

Why are some knives, forks and spoons silver plated?

A

To protect the metal from corrosion and reduce the cost

4
Q

Where does the object to that you want electroplating?

A

At the negative electrode

5
Q

What is the positive electrode made of for electroplating?

A

The metal you want on the object

6
Q

What is the electrolyte for electroplating?

A

A solution containing ions of the plating metal

7
Q

What happens at the positive electrode in electroplating?

A

Atoms of the plating metal lose electrons to become positive metal ions that go into the solution

8
Q

What happens at the negative electrode in electroplating?

A

The now positive metal ions in the solution gain electrons from the negative electrode so they form metal atoms that are deposited on the object to be plated

9
Q

What is the half equation for nickel plating at the positive electrode?

A

Ni(s) –> Ni2+(aq) + 2e-

10
Q

What is the half equation for nickel plating at the negative electrode?

A

(To be plated)

Ni2+(aq) + 2e- –> Ni(s)

11
Q

What is electroplating?

A

Using electrolysis to put a thin coating of metal onto an object