Electrolysis

What is electrolysis?

• breaking down of a compound using a current
• making a compound using a current

Tags

NGSS.HS-PS2-5

Which statement correctly describes the 2 electrodes?

• The anode is negative and the cathode is positive
• The anode and cathode are both positive
• The anode is positive and the cathode is negative
• The anode and cathode are both negative.

Tags

NGSS.HS-PS3-5

Positive ions (cations) will move towards the cathode (-) where they will discharge by....

• Breaking apart
• Losing electrons
• Clumping together.
• Gaining electrons

What is the equation to show what happens to Cl ions at the anode.

• Cl^- --> Cl + e-   
• 2Cl^- --> Cl₂ + 2e-   
• Cl₂ + 2e-   2Cl^- 
• Cl₂ + 2e-  _-->  2Cl^- 

Choose the half-equation that shows the discharge of aluminium ion.

• Al³⁺ - 3e^- --> Al

• Al²⁺ + 3e^- --> Al

• Al³⁺ + 3e^- --> Al

• Al³⁺ --> Al + 3e^-

What is the half-equation for the discharge of hydroxide ions?

• 2O^2- --> O₂ + 4e^-

• OH^- --> OH + e

• 4OH^- --> 2H₂O + O₂ + 4e^-

• 2H₂O + O₂ + 4e^- --> 4OH^-

What is the product formed at the cathode during the electrolysis of molten magnesium fluoride (hint: consider the oxidation states of the products)?

• magnesium
• hydrogen
• fluorine
• oxygen

Describe oxidation in terms of electrons

• oxidation is gain of electrons
• oxidation is loss of electrons

Describe reduction in terms of electrons

• reduction is gain of electrons
• reduction is loss of electrons

Tags

NGSS.HS-PS1-7

The electrode connected to the positive terminal of a battery is __________.

• cathode
• anode