C6

What does electrolysis mean?
Breaking down using electricity
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What happens in electrolysis?
You use an electric current to break down an ionic compound
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What is the compound that is broken down by electrolysis?
Electrolyte
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How to set up an electrical circuit for electrolysis
Two electrodes that dip into the electrolyte with a gap between them
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What is the positive electrode called?
Anode
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What is the negative electrode called?
Cathode
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Why are the electrodes sometimes made of an unreactive substance?
So the electrodes do not react with the electrolyte or products made in electrolysis
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What happens during electrolysis?
Positive ions move to cathode and negative ions move to anode
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What happens when the ions reach the electrodes?
Lose charge and become elements
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What happens to metals of low reactivity below hydrogen when they are in an aqueous solution?
They are deposited from their aqueous solutions
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What do negatively charged ions do?
Lose electrons
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What do positively charged ions do?
Gain electrons
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In the electrolysis of molten lead bromide where does lead move to?
Cathode and gains two electrons
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In the electrolysis of molten lead bromide where does bromide move to?
Anode and loses two electrons
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What is the equation at the cathode?
*
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What is the equation at the anode?
*
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What is the equation for water and OH- ions?
*
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Whatt happens if hydrogen is less reactive than an element?
Hydrogen gas is given off at the electrode
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When hydroxide ions are discharged what do you see at the anode?
Oxygen
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What is the order of discharge at the anode?
halide ion>hydroxide>all negatively charged ions
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What do they mix aluminium with in the electrolysis of it?
Cryolite
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Why do they mix it with cryolite?
To reduce the melting point
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What is the equation for the electrolysis?
*
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What is formed at the cathode?
Aluminium
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What is formed at the anode?
Oxygen
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What is the half equation at the cathode?
*
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What is the half equation at the anode?
*
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Why are the carbon anodes replaced regularly?
Because they gradually burn away as the oxygen reacts with the carbon anodes which form CO2
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What is brine?
Concentrated sodium chloride solution
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What is produced at the anode?
Chlorine
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What is produced at the cathode?
Hydrogen gas
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What is also formed?
Sodium hydroxide
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Equation for electrolysis of brine?
*
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What is the half equation at the anode?
*
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Other cards in this set

Card 2

Front

What happens in electrolysis?

Back

You use an electric current to break down an ionic compound

Card 3

Front

What is the compound that is broken down by electrolysis?

Back

Preview of the front of card 3

Card 4

Front

How to set up an electrical circuit for electrolysis

Back

Preview of the front of card 4

Card 5

Front

What is the positive electrode called?

Back

Preview of the front of card 5
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