Full Answer
Why does a copper electrode gain mass when placed in electrolysis?
The copper electrode gained mass. This implies that the Cu metal ions in the electrolyte solution become metal atoms and deposit on the electrode: Cu2+ (aq)+2e− → Cu (s). When Cu2+ (aq)+2e− → Cu (s) the electrons are taken from the cathode, which becomes positively charged.
What happens to the mass of copper in the activity series?
(Zinc is above copper in the activity series of metals) the mass of copper decreases; the mass of copper increases; current flows but the mass of copper does not change; no current flows and the mass of copper does not change current flows but the mass of copper does not change
How is copper purified by electrolysis?
Electrolysis is used to extract and purify metals. Copper is purified by electrolysis. Electricity is passed through solutions containing copper compounds, such as copper (II) sulfate. The anode (positive electrode) is made from impure copper and the cathode (negative electrode) is made from pure copper. Pure copper forms on the cathode.
How does pure copper form on the cathode?
Pure copper forms on the cathode. The slideshow shows how this works: 1. A beaker with pure and impure copper rods dipped into copper (II) sulfate solution
What happens to the mass of copper electrode in the following reaction?
The mass of the copper electrode increases as the reaction proceeds. Explanation: The representation of electrochemical cell is given by writing the anode on left hand side followed by its ion with its molar concentration. It is followed by a salt bridge.
What happens to the mass of the metal copper electrode?
The copper electrode gained mass. This implies that the Cu metal ions in the electrolyte solution become metal atoms and deposit on the electrode: Cu2+(aq)+2e− → Cu(s). Reduction occurs at the copper electrode.
Why does the mass of a copper electrode increase?
The electrons flow from the Mg electrode to the Cu electrode. The salt bridge allows ions to flow between the half-cells. Copper ions from the solution are reduced to copper atoms at the electrode, increasing the mass of the electrode.
What happens to the mass of electrodes?
Mass decreases as the reacting anode material becomes aqueous. Site of reduction: electrons are gained by the ions around the cathode. These ions are the oxidizing agent because by taking electrons, they cause the anode to be oxidized. Mass increases as aqueous ions turn to solid at the cathode.
What happens to the mass of each electrode during electrolysis?
During electrolysis, the anode loses mass as copper dissolves, and the cathode gains mass as copper is deposited.
Which electrode if any gains mass as the reaction proceeds?
Answers to Chemistry End of Chapter Exercises With a salt bridge, each half-cell remains electrically neutral and current can flow through the circuit. 9. An active (metal) electrode was found to gain mass as the oxidation-reduction reaction was allowed to proceed.
What happened to the mass of deposited Cu when the applied current is increased?
It can be seen from Fig. 5 (a) that for the same Cu2+ concentration, with current density increases, Cu deposition mass also increases. The higher Cu2+ concentration, the more Cu deposition mass.
Does the mass of the Pt electrode increase/decrease or remain the same as the cell operates?
(d) Describe what happens to the mass of each electrode as the cell operates. The mass of the Pb electrode decreases and the mass of the Cu electrode increases. 1 point is earned for both descriptions.
What would happen to the mass of the negative electrode during this electrolysis?
We will decrease the mass of Fe(s) and increase the amount of Fe+(aq) ions. Therefore the cathode is the solid zinc and we are forming more of the solid zinc from the zinc ions in solution gaining electrons (i.e. being reduced) and forming solid zinc so the mass of the cathode is increasing.
Do electrodes increase in mass?
Re: Electrode Mass Changing the mass of the electrode, whether it be the cathode or the anode, will not affect the Ecell. It could be doubled, halved, or changed by any factor; the overall change will have no affect on the Ecell.
Why is mass gained at the cathode?
1:2810:53Mass gained or lost by an electrode- Grade 12 Electrochemistry - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo let's label. That. Alright then remember that the cathode is we reduction takes place and theMoreSo let's label. That. Alright then remember that the cathode is we reduction takes place and the anode is where oxidation. Takes place. So the reduction of course means that we are gaining electrons.
Does electrolysis change mass?
Thus the mass of anode will decrease, the mass of cathode will increase and there will be no change in colour of electrolyte or maybe a little.
Why is the cathode an oxidizing agent?
These ions are the oxidizing agent because by taking electrons, they cause the anode to be oxidized. Mass increases as aqueous ions turn to solid at the cathode. why does the mass of the cathode increase?
What happens to the anode during electrolysis?
During electrolysis, the anode loses mass as copper dissolves, and the cathode gains mass as copper is deposited . A half-equation shows what happens at one of the electrodes during electrolysis. Electrons are shown as e -.
Why does the mass of a cathode increase?
The cathode gradually increases in mass because of the production of copper metal. The concentration of copper (II) ions in the half-cell solution decreases. The cathode is the positive electrode.
Is zinc oxidized?
3 Answers. As you have figured out, the zinc electrode is undergoing oxidation since zinc is a stronger reducing agent than copper. Thus, the zinc electrode becomes thinner as shown in your image. It is oxidizing into soluble Zn2+ ions and thus its mass decreases.
What is the part of a voltaic cell that undergoes oxidation?
anode. One part of a voltaic cell in which either oxidation or reduction occurs. half-cell. The electrode at which reduction occurs. cathode. A group of cells that are connected together. battery. A voltaic cell in which a fuel substance undergoes oxidation and from which electrical energy is obtained continuously. fuel cell.
What is cell potential?
What is the cell potential? the difference in reduction potentials of the half-cells; the difference in oxidation potentials of the half-cells; the sum of reduction potentials of the half-cells; the sum of oxidation potentials of the half-cells. the difference in reduction potentials of the half-cells.
What happens to lead storage battery when it discharges?
When a lead storage battery discharges, the concentration of. sulfuric acid increases; sulfuric acid decreases; lead sulfate in the battery decreases; lead sulfate in the battery remains constant. sulfuric acid decreases.
Does a reaction occur in a cell?
no reaction occurs in the cell; water is produced at both electrodes; hydrogen is produced at the anode and oxygen at the cathode; hydrogen is produced at the cathode and oxygen at the anode. no reaction occurs in the cells.
What happens to the anode in electrolysis?
During electrolysis, the anode loses mass as copper dissolves, and the cathode gains mass as copper is deposited.
How is copper purified?
Copper is purified by electrolysis. Electricity is passed through solutions containing copper compounds, such as copper (II) sulfate. The anode (positive electrode) is made from impure copper and the cathode (negative electrode) is made from pure copper. Pure copper forms on the cathode. The slideshow shows how this works:
What is the half equation of an anode?
Electrons are shown as e-. These are the half-equations: anode: Cu → Cu2+ + 2e- (oxidation) cat hode: Cu2+ + 2e- → Cu ( reduction) Oxidation happens at the anode because electrons are lost.
