Podcast
Questions and Answers
Which of the following statements accurately describes the movement and behavior of ions during electrolysis?
Which of the following statements accurately describes the movement and behavior of ions during electrolysis?
- Negatively charged ions move towards the cathode and lose electrons.
- Positively charged ions move towards the cathode and gain electrons. (correct)
- Positively charged ions move towards the anode and lose electrons.
- Negatively charged ions move towards the anode and gain electrons.
In the electrolysis of molten lead bromide ($PbBr_2$), what product is formed at the negative electrode (cathode)?
In the electrolysis of molten lead bromide ($PbBr_2$), what product is formed at the negative electrode (cathode)?
- Bromine gas ($Br_2$)
- Lead ions ($Pb^{2+}$)
- Lead ($Pb$) (correct)
- Bromide ions ($Br^-$)
Which of the following is the primary function of a direct current (DC) power supply in an electrolysis setup?
Which of the following is the primary function of a direct current (DC) power supply in an electrolysis setup?
- To supply the electrical energy needed to drive non-spontaneous chemical reactions. (correct)
- To neutralize the charges of the ions in the electrolyte.
- To provide a continuous alternating flow of electrons.
- To heat the electrolyte to increase ion mobility.
What is the role of electrodes in an electrolytic cell?
What is the role of electrodes in an electrolytic cell?
Considering the process of electrolysis, which statement accurately describes the relationship between electrical energy and chemical reactions?
Considering the process of electrolysis, which statement accurately describes the relationship between electrical energy and chemical reactions?
What characteristic is essential for a substance to function as an electrolyte?
What characteristic is essential for a substance to function as an electrolyte?
During electrolysis, if chloride ions ($Cl^−$) are attracted to the anode, what happens to them?
During electrolysis, if chloride ions ($Cl^−$) are attracted to the anode, what happens to them?
In the electrolysis of molten salts, why is it necessary for the salt to be in a molten state?
In the electrolysis of molten salts, why is it necessary for the salt to be in a molten state?
Flashcards
Electrolysis
Electrolysis
Using electricity to break down a compound.
Electrolyte
Electrolyte
A substance that conducts electricity when molten or dissolved.
Ions
Ions
Compounds formed when atoms gain or lose electrons.
Anode
Anode
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Cathode
Cathode
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Oxidation (in Electrolysis)
Oxidation (in Electrolysis)
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Reduction (in Electrolysis)
Reduction (in Electrolysis)
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Molten
Molten
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Study Notes
- Electrolysis uses electricity to break down electrolytes, forming elements.
- Electrolytes are ionic compounds that are molten or dissolved, allowing ions to move freely.
- Electrolysis uses electrical energy from a direct current (DC) to break down electrolytes
- Free-moving ions in electrolytes are attracted to oppositely charged electrodes connected to the DC supply.
- The positively charged electrode is the anode, attracting negatively charged ions.
- When ions reach an electrode, they gain or lose electrons, forming atoms or molecules of elements.
Example: Molten Lead Bromide (PbBr2(l))
- Positively charged lead ions move to the negative electrode (cathode), gaining electrons to form lead atoms.
- Negatively charged bromide ions move to the positive electrode (anode), losing electrons to form bromine atoms which then pair to form Br2 molecules.
Electrolysis of Molten Salts
- A metal is formed at the cathode.
- A non-metal is formed at the anode.
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Description
Explanation of electrolysis, the process of using electricity to break down electrolytes into their constituent elements. Focus on the movement of ions to electrodes and their subsequent electron exchange to form atoms or molecules. Includes the electrolysis of molten lead bromide as an example.
