Lesson Worksheet: Secondary Galvanic Cells Chemistry

Start Practising

In this worksheet, we will practice describing secondary cells and explain how they can be recharged.

Q1:

Which of the following statements correctly describes the movement of lithium ions during discharge of a lithium-ion battery?

  • AFrom the positive graphite electrode to the negative electrode where they form a lithium compound
  • BFrom the negative electrode as part of a lithium compound to the positive graphite electrode
  • CFrom the positive electrode as part of a lithium compound to the negative graphite electrode
  • DFrom the negative graphite electrode to the positive electrode where they form a lithium compound

Q2:

Two slightly used replacement lead–acid batteries are compared before being installed into a vintage automobile. Battery A is found to have a specific gravity of 1.25 and battery B has a specific gravity of 1.19.

What is the name of the scientific instrument used to measure the specific gravity of the sulfuric acid in the lead–acid batteries used in cars?

  • AHydrometer
  • BEudiometer
  • CGravimeter
  • DManometer
  • EDynamometer

Which battery is closest to being fully charged?

  • ABattery A
  • BBattery B

In which battery is the concentration of sulfuric acid lower?

  • ABattery B
  • BBattery A

Q3:

What is the overall reaction equation for the spontaneous redox reaction that occurs when lead–acid batteries discharge?

  • A2PbSO()+2HO()2PbO()+2HSO()4224slsaq
  • BPb()+4PbSO()+2HO()2PbSO()+PbO()+2HSO()saqlssaq424224
  • CPbO()+2PbSO()+2H2PbSO()+Pb()+2HO()24242saqssl
  • D2PbSO()+2HO()Pb()+PbO()+2HSO()42224slssaq
  • EPb()+PbO()+2HSO()2PbSO()+2HO()ssaqsl22442

Q4:

Which of the following half-equations shows the reaction occurring at the negative plate during the discharge phase of a battery?

  • APbSO()+2HO()PbO()+HSO()+2H()+2e42224+–slsaqaq
  • BPb()+HSO()PbSO()+2H()+2esaqsaq244+−
  • CPbSO()+2H()+2ePb()+HSO()4+–24saqsaq
  • DPbO()+HSO()+2H()+2ePbSO()+2HO()224+–42saqaqsl

Q5:

A generic car battery usually consists of six cells, each of which generates approximately +2.0 V.

What is the overall potential of a car battery consisting of six cells? Give your answer to one decimal place.

To drive the discharging reaction backward and initiate charging of the battery, an external potential must be applied to restore the Pb and PbO2 plates to their original condition. Which of the following statements explains the necessary magnitude of this external potential?

  • AThe external potential must be one-sixth of the internal potential created by the battery during discharge.
  • BThe external potential must be greater than the internal potential created by the battery during discharge.
  • CThe external potential must be +2.0 V.
  • DThe external potential must be −2.0 V.
  • EThe external potential must be less than the internal potential created by the battery during discharge.

Q6:

The diagram shows an illustration of where the lead–acid battery is situated in terms of other electrical devices in modern automobiles.

Which circuit in this diagram represents the discharge phase of the battery?

  • AThe red circuit
  • BThe purple circuit

Which circuit in this diagram represents the recharge phase of the battery?

  • AThe purple circuit
  • BThe red circuit

Which circuit is an example of a galvanic or voltaic cell?

  • AThe red circuit
  • BThe purple circuit

Which circuit is an example of an electrolytic cell?

  • AThe red circuit
  • BThe purple circuit

Q7:

Depending on how the dissociation of sulfuric is considered, the half-equations of a lead–acid battery can vary slightly in different sources.

Which of the following pairs shows two half-equations that correctly combine to generate the overall reaction equation for the entire cell?

  • APair 2
  • BPair 3
  • CPair 1

Q8:

Which of the following is not true about a lead–acid battery?

  • AIt is impossible to manufacture a lead–acid battery of large volume that consists of more than six cells.
  • BIt has a positive electrode (cathode) that is mostly a lead network filled with a paste of lead dioxide.
  • CIt has a negative electrode (anode) that is mostly a lead network filled with spongy lead.
  • DIt consists mostly of six cells connected in series that are dipped in diluted sulfuric acid as an electrolyte.
  • EIt is made of a solid rubber or plastic (polystyrene).

Q9:

Why is no salt bridge, porous separator, or an equivalent necessary for lead–acid batteries?

  • ABoth half-cells use the same electrolyte.
  • BThe battery casing acts as a salt bridge, completing the circuit.
  • CThe lead atoms and ions are too large to desorb from the electrodes.
  • DA porous separator would prevent the recharging of the battery.
  • ESecondary galvanic cells do not need salt bridges.

Q10:

Which of the following is not true about the composition of a lithium-ion battery?

  • AThe cathode electrode will mostly be lithium cobalt oxide (LiCoO)2.
  • BThe anode electrode will mostly be lithium graphite (LiC)6.
  • CA very thin layer of plastic separates 2 electrodes (the anode and the cathode) and allows the passage of ions.
  • DThe 2 electrodes and the separator are dipped in the electrolyte of the anhydrous solution of LiCO3.
  • EThe 2 electrodes and the separator are dipped in the electrolyte of the anhydrous solution of LiPF6.

Practice Means Progress

Boost your grades with free daily practice questions. Download Nagwa Practice today!

scan me!

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.