🔍 Key Concepts

• Basic construction of a lead-acid storage cell • Chemical difference between positive and negative plates • The role of lead peroxide vs. spongy lead in the cell reactions

💭 Think About

• Think about which material is in a more reactive, porous (spongy) form to accept and give up electrons easily. • Recall which plate (positive or negative) is associated with lead peroxide in standard battery descriptions. • Consider what substance the plates are made of when the battery is fully charged, not discharged.

✅ Before You Answer

• Review which plate in a charged lead-acid cell is lead peroxide (PbO₂). • Confirm which plate uses pure spongy lead (Pb) as its active material. • Eliminate any option that incorrectly mixes the roles of Pb and PbO₂ on the positive vs. negative plates.