Electrochemistry Challenge

What is a galvanic cell?

• A galvanic cell is an electrochemical cell that generates electrical energy from spontaneous redox reactions.

• A galvanic cell is used for cooking food

• A galvanic cell is a type of fruit

• A galvanic cell is a musical instrument

Explain the process that occurs in an electrolytic cell.

• The process in an electrolytic cell involves using an external voltage source to drive a non-spontaneous chemical reaction, attracting anions to the anode for oxidation and cations to the cathode for reduction.

• Cations are attracted to the anode for reduction in an electrolytic cell

• The process in an electrolytic cell involves spontaneous chemical reactions

• An electrolytic cell does not involve the use of an external voltage source

Define redox reactions in the context of electrochemistry.

• Redox reactions involve only the gain of electrons

• Redox reactions in electrochemistry involve electron transfer where oxidation is the loss of electrons and reduction is the gain of electrons.

• Redox reactions involve the transfer of protons instead of electrons

• Redox reactions do not involve any electron transfer

What are electrode potentials and how are they measured?

• Electrode potentials are measured by tasting the electrode material.

• Electrode potentials are measured by connecting the electrode to a standard lithium electrode.

• Electrode potentials are measured by connecting the electrode to a standard hydrogen electrode and measuring the potential difference using a voltmeter.

• Electrode potentials are measured by observing the color change of the electrode.

State Faraday's first law of electrolysis.

• The amount of chemical change is not affected by the quantity of electricity passed through the electrolyte.

• The amount of chemical change is inversely proportional to the quantity of electricity passed through the electrolyte.

• Amount of chemical change is proportional to the quantity of electricity passed through the electrolyte.

• The amount of chemical change is proportional to the temperature of the electrolyte.

How does a galvanic cell generate electricity?

• By converting heat energy into electrical energy

• Through a redox reaction between two half-cells, where one undergoes oxidation and the other undergoes reduction, creating an electric current

• By utilizing solar panels to capture sunlight and convert it into electricity

• Through a chemical reaction that releases sound energy

Describe the role of salt bridges in galvanic cells.

• Salt bridges in galvanic cells are used to store excess charge, increasing the cell's efficiency.

• Salt bridges in galvanic cells are only necessary for aesthetic purposes and do not impact the cell's function.

• Salt bridges in galvanic cells prevent the flow of ions, causing the cell to stop generating electricity.

• Salt bridges in galvanic cells facilitate the flow of ions to maintain electrical neutrality and allow the cell to continue generating electricity.

What is the standard hydrogen electrode and its significance?

• The standard hydrogen electrode is a reference electrode used in electrochemical measurements, providing a stable reference point for measuring electrode potentials.

• The standard hydrogen electrode measures atmospheric pressure.

• The standard hydrogen electrode is only applicable in organic chemistry experiments.

• The standard hydrogen electrode is used for heating purposes in laboratories.

Explain the concept of cell potential in electrochemical cells.

• Cell potential is the voltage difference between two half-cells in an electrochemical cell.

• Cell potential is the speed at which electrons move through the cell

• Cell potential is the resistance of the electrolyte in the cell

• Cell potential is the amount of energy stored in a battery

How does electrolysis relate to the production of metals?

• Electrolysis is a process that involves melting metals

• Electrolysis is used to produce metals from water

• Electrolysis is used to extract metals from their ores by breaking down compounds into their constituent elements.

• Electrolysis is a method for refining metals