The difference between the electrode potentials of two electrons when no current is drawn through the cell is called:

Options

A. cell potential
B. cell emf
C. potential difference
D. cell voltage

Answer

To solve the question, we need to identify what the difference between the electrode potentials of two electrodes is called when no current is flowing through the electrochemical cell. Here's a step-by-step breakdown of the solution:

### Step 1: Understand the Concept of Electrode Potential
Electrode potential refers to the ability of an electrode to gain or lose electrons when in contact with an electrolyte. Each electrode in a cell has a specific potential based on its chemical environment.

**Hint:** Remember that electrode potential is a measure of how easily an electrode can either gain or lose electrons.

### Step 2: Define the Condition of No Current Flow
When no current is drawn from the cell, it means that the electrochemical reactions at the electrodes are at equilibrium. In this state, the potential difference between the two electrodes is stable.

**Hint:** Think about what happens in a battery when it is not connected to a circuit; it still has a potential difference.

### Step 3: Identify the Term for the Difference in Electrode Potentials
The difference in electrode potentials when no current is flowing is specifically referred to as the electromotive force (EMF) of the cell. This is a key term in electrochemistry.

**Hint:** EMF is often denoted as the maximum potential difference a cell can provide under open-circuit conditions.

### Step 4: Choose the Correct Answer
From the options provided:
- Cell potential
- Cell EMF
- Potential difference
- Cell voltage

The correct term for the difference in electrode potentials when no current is drawn is **cell EMF**.

**Hint:** Look for the term that specifically describes the potential difference in a non-discharging state.

### Final Answer
The difference between the electrode potentials of two electrodes when no current is drawn through the cell is called **cell EMF** (electromotive force).