1. If electrons are gained in a reaction, that species
a. is reduced ***
b. is oxidized
c. is the reducing agent
d. ends up with a higher oxidation state
2. The anode of a voltaic cell
a. provides a pathway for the diffusion of anions
b. attracts diffusing cations
c. is the electrode where oxidation occurs***
d. is the electrode where reduction occurs
3. The oxidizing agent in the reaction below is 3CuCl2(aq)+2Al(s) →3Cu(s)+2AlCl3(aq)
a. Cu2+ ***
b. Al
c. Cu
d. Al3+
1. Correct answer: a. is reduced.
Explanation: In a redox reaction, reduction involves the gain of electrons. If electrons are gained in a reaction, it means that the species is being reduced.
2. Correct answer: c. is the electrode where oxidation occurs.
Explanation: In a voltaic cell, oxidation occurs at the anode. The anode is the electrode where electrons are lost (oxidized) and flows towards the cathode.
3. Correct answer: a. Cu2+.
Explanation: The oxidizing agent is the species that undergoes reduction, which means it accepts electrons. In the given reaction, Cu2+ is being reduced to Cu. Therefore, Cu2+ is the oxidizing agent.
To get the answers to these questions, we can rely on our understanding of redox reactions and the definitions of terms like oxidation, reduction, anode, and oxidizing agent. Let's break it down:
1. If electrons are gained in a reaction, that species
To answer this question, we need to know the definitions of oxidation and reduction. Oxidation refers to the loss of electrons, while reduction refers to the gain of electrons. In a redox reaction, one species is oxidized and another is reduced. Since the question states that electrons are gained, we can conclude that the species is reduced. Therefore, the correct answer is a. is reduced.
2. The anode of a voltaic cell
To determine the role of the anode in a voltaic cell, we need to understand the basics of a voltaic cell. A voltaic cell is an electrochemical cell that uses a spontaneous redox reaction to generate electrical energy. In this context, the anode is the electrode where oxidation occurs. Oxidation involves the loss of electrons. Therefore, the correct answer is c. is the electrode where oxidation occurs.
3. The oxidizing agent in the reaction below is 3CuCl2(aq) + 2Al(s) → 3Cu(s) + 2AlCl3(aq)
To identify the oxidizing agent in a redox reaction, we need to look for the substance that gets reduced. In this reaction, copper ions (Cu2+) are reduced to copper (Cu). Since the oxidizing agent is the species causing oxidation (which involves the loss of electrons), we can conclude that the correct answer is a. Cu2+.
By understanding the concepts of oxidation, reduction, anode, and oxidizing agent, we can determine the answers to these questions.