The question asks to identify what a galvanic or voltaic cell is. This requires understanding the fundamental definition and function of these electrochemical cells.
A) Electrical Energy — A galvanic or voltaic cell is a device that converts chemical energy into electrical energy through spontaneous redox reactions. Hence, it is a source of electrical energy.
The question asks for the name of a device that uses electrical energy to drive non-spontaneous chemical reactions. This concept is fundamental to electrochemistry, distinguishing between cells that produce electricity from chemical reactions and those that use electricity to force chemical reactions.
Correct Option: C) Electrolytic Cell is a device for using electrical energy to carry non-spontaneous chemical reactions. This process is called electrolysis.
This question tests fundamental knowledge of electrochemistry, specifically the direction of electron flow and conventional current in a galvanic cell (like a Daniell cell, which uses Cu and Zn electrodes). In such cells, the more reactive metal acts as the anode and gets oxidized, releasing electrons. These electrons then flow through the external circuit to the less reactive metal, which acts as the cathode, where reduction occurs. Conventional current is defined as flowing in the opposite direction to electron flow.
Let's re-read the question carefully: "________ flow from Cu to Zn and current flows from Zn to Cu."
In a galvanic cell with Zn and Cu:
Therefore:
Now, let's look at the statement: "________ flow from Cu to Zn and current flows from Zn to Cu."
This statement is actually describing a scenario where the current flows from Zn to Cu. This is the opposite of what happens in a galvanic cell (where current flows from Cu to Zn). If current flows from Zn to Cu, then electrons must be flowing from Cu to Zn. This would be the case in an electrolytic cell where external power is applied, forcing the reaction in the non-spontaneous direction, or if the question is framed from a different perspective than a standard galvanic cell. However, given the options, the most common context for Cu and Zn is a galvanic cell.
Let's re-examine the question's premise. It states: "________ flow from Cu to Zn and current flows from Zn to Cu."
If current flows from Zn to Cu, then electrons must flow from Cu to Zn. So the blank should be filled with "Electrons".
However, this contradicts the standard galvanic cell where electrons flow from Zn to Cu and current flows from Cu to Zn. There might be a slight confusion in the question's phrasing or it's describing a non-standard setup or an electrolytic cell.
Let's assume the question intends to ask about the standard galvanic cell and there's a typo in the question itself, or it's testing the understanding of the relationship between electron flow and current flow. If electrons flow from Cu to Zn, then current flows from Zn to Cu. This is a consistent statement.
In a typical Daniell cell (Zn-Cu galvanic cell):
The question states: "________ flow from Cu to Zn and current flows from Zn to Cu."
If we fill the blank with 'Electrons', the statement becomes: "Electrons flow from Cu to Zn and current flows from Zn to Cu." This is internally consistent, as electron flow is opposite to conventional current flow. So, if current flows from Zn to Cu, then electrons must flow from Cu to Zn.
Therefore, the blank should be filled with 'Electrons'.
B) Electrons — If electrons flow from Cu to Zn, then by definition, conventional current flows in the opposite direction, i.e., from Zn to Cu. This makes the statement internally consistent. While this direction of electron flow (Cu to Zn) is opposite to what happens in a spontaneous Daniell cell, the question asks to complete a statement where the relationship between the blank and current flow is maintained. The fundamental principle is that electrons and conventional current flow in opposite directions.
The question asks about the fundamental energy conversion occurring in a galvanic cell. A galvanic cell (also known as a voltaic cell) is designed to produce electrical energy from a spontaneous chemical reaction. We need to identify the type of energy that is converted into electrical energy.
Correct Option: D) Chemical Energy. A galvanic cell converts the chemical energy released from a spontaneous redox reaction into electrical energy.
The question asks about the thermodynamic quantity whose change in a spontaneous redox reaction is converted into electrical work. This relates to the maximum useful work that can be obtained from a chemical reaction.
Correct Option: A) Gibbs Energy. The change in Gibbs Energy (\(\Delta G\)) represents the maximum non-PV work that can be obtained from a thermodynamic system at constant temperature and pressure. In the context of a spontaneous redox reaction in an electrochemical cell, this non-PV work is electrical work.
Whose reaction is the equation of Zn(s) + Cu2+(aq) → Zn2+ (aq) + Cu(s) ?
Protons Reaction
Redox Reaction
Chemical Energy
Electron Reaction
The given chemical equation represents a reaction where zinc metal reacts with copper ions to form zinc ions and copper metal. To identify the type of reaction, we need to analyze the change in oxidation states of the elements involved.
Since both oxidation and reduction occur simultaneously in the reaction, it is classified as a redox (reduction-oxidation) reaction.
Correct Option: B) Redox Reaction
A redox reaction is a chemical reaction in which the oxidation states of atoms are changed. This involves the transfer of electrons between species. In the given reaction, zinc loses electrons (oxidation) and copper gains electrons (reduction), making it a classic example of a redox reaction.