Identify the location of oxidation in an electrochemical cell. a. The anode b. The cathode c. The electrode d. The salt bridge e. The socket (9) 7. Determine the cell notation for the redox reaction given below: 3 Clzc+2F0w-+6 Cl(aq) + 2 Fe . ChcClag) | Pt || FecFerg) b. Cir Claw | Pt | FecFew c. Fe(ne) | Few | Clow) Claw Pt) d. FeCl2co | Few CP c. Fem Fec|| Clzco CI (PRO) 8. How many electrons are transferred in the following reaction? (The reaction is unbalanced.) Ni +Cr – Cr+Nim) 6 b. 4 c. 3 d 2 e 1 Hylam R21st PI 9. Which statement about this concentration cell is correo The electrode on the left side is the anode. b. The electrode on the right side is the electron Anions in the salt bridge migrate to the right side. d. Hydrogen ions are reduced on the left side. The pH of the solution on the right side is lower than the pH on the left side. C HICH
The Correct Answer and Explanation is :
Let’s go through each question and provide the correct answers along with explanations.
1. Identify the location of oxidation in an electrochemical cell:
Answer: a. The anode
Explanation:
In an electrochemical cell, oxidation occurs at the anode. Oxidation is the process of losing electrons, and the anode is the electrode where this happens. Electrons are released by the species being oxidized at the anode and then flow through the external circuit to the cathode. The anode is marked with a negative charge in a galvanic cell and positive in an electrolytic cell. Remember the mnemonic “An Ox” for “Anode is where Oxidation happens.”
2. Determine the cell notation for the redox reaction given below:
Answer: b. Cl₂ (aq) | Pt | Fe²⁺ (aq), Fe³⁺ (aq) | Cl⁻ (aq)
Explanation:
Cell notation for a redox reaction shows the arrangement of electrodes and solutions involved in the reaction. The general format is:
- Anode | Anode Solution || Cathode Solution | Cathode
- Pt is often used as an inert electrode when no metal is involved in the reaction. In the given reaction, Fe²⁺ is oxidized to Fe³⁺ at the anode and Cl₂ is reduced to Cl⁻ at the cathode. The solid platinum electrode is used as a conductor for the reaction involving ions.
3. How many electrons are transferred in the following reaction?
Ni + Cr → Cr²⁺ + Ni²⁺
Answer: b. 4
Explanation:
Let’s break down the reaction:
- Ni goes from Ni (0) to Ni²⁺. This means it loses 2 electrons (oxidation).
- Cr goes from Cr (0) to Cr²⁺. This means it gains 2 electrons (reduction).
Overall, 2 electrons are lost by Ni and 2 electrons are gained by Cr, so a total of 4 electrons are transferred in the reaction.
4. Which statement about this concentration cell is correct?
Answer: a. The electrode on the left side is the anode.
Explanation:
In a concentration cell, the two half-cells have the same type of electrode and electrolyte, but the concentration of ions is different. The side with the lower concentration of ions will be the anode because oxidation occurs at the anode, and the concentration gradient drives the electrochemical reaction. The electrode with the higher ion concentration is the cathode, where reduction occurs. Therefore, the anode is on the left side, and electrons flow from left to right.
This covers the answers and explanations for all the questions!