C6 Flashcards

1
Q

What is the electrolyte?

A

The compound that is broken down in electrolysis.

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2
Q

What are the two electrodes?

A

The positive electrode is the anode and the negative electrode is the cathode.

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3
Q

Which ions go where and what happens?

A

The negative ions go to the anode and the positive ions go to the cathode, they lose their charge and become elements.

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4
Q

What is cryolite?

A

It is a catalyst used to lower the melting and boiling temperatures of a substance.

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5
Q

How are the two ways something can be electrolysed and why?

A

Either being molten or in a solution due to the charge being able to move.

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6
Q

What are the rules for half equations for electrolysis?

A

Hydrogen would form at the cathode when the metal is more reactive than it, and at the anode if there is a halide ion present that is discharged, but if not hydroxide ions are discharged.

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7
Q

What do the half equations look like?

A

2H+(aq)+2e-=H2(g)
4OH-(aq)=2H2O(l)+O2(g)+4e-

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8
Q

What are the uses of electrolysis?

A

Pans, overhead power cables, aeroplanes, cooking foil, drink cans, window and patio door frames, bicycle frames and car bodies.

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9
Q

What is bauxite?

A

The ore of aluminium which is electrolysed in extraction of aluminium, and it is mixed with cryolite to reduce the melting point.

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10
Q

Why does the anode need to be replaced?

A

This is due to the carbon anode reacting with the oxygen formed, making carbon dioxide.

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11
Q

What are the half equations of aluminium electrolysis?

A

Al3+(l)+3e-=Al(l)
2O2-(l)=O2(g)+4e-

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12
Q

What is the electrolysis of brine?

A

You get chlorine gas an hydrogen gas at the anode and cathode and you get sodium hydroxide left in the solution.

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