Primary Battery ( 原电池 )

What did Mrs. Green suffer from?

varieties of electric equipment

chemical energy electrical energy

H 2 SO 4 ( aq ) Primary Battery （ 原电池 ） Zn – 2e - =Zn 2+ 2H + + 2e - = H 2 cathode ( 负极 ) oxidation ( 氧化反应 ) anode ( 正极 ) reduction ( 还原反应 )

Primary Battery The device that converts chemical energy to electrical energy 将化学能转化为电能的装置。 The essence of primary battery is redox reaction. 原电池的本质是氧化还原反应。 basic conditions of forming primary battery :( 形成条件） 形成条件 ◆ Two different metals to be the electrodes, or one is not metal but conductor. Electrolytes should be stuffed between two electrodes. ◆ The whole circuit should be closed. ◆

You are provided with copper wires, magnesium wires, and some fruits. Can you design a primary battery?

modern battery industry

To be practical,what features the batteries should have? Be able to produce a stable current. ◆ They should be safe, convenient to carry. ◆ Be useful in special field. ◆ Be easy to recycle, not polluting the environment. ◆

Research subject before class Investigate categories, use range, properties, price, oxidants and reductants of common cells. Investigate how to deal with the waste cells, and the value of recycling waste cells.

Dry cells ( 干电池） Zn-MnO 2 dry cell Carbon rod anode Zinc cathode Ammonium chloride electrolyte alkaline dry cells （碱性干电池）

kinds of alkaline dry cells

Lead storage batteries ( 铅蓄电池） cathode : Pb (lead)anode : PbO 2 (lead dioxide) electrolyte: H 2 SO 4 (aq)

Lithium cells （锂电池）

heart pacemaker ( 心脏起博器 )

Novel fuel cells （新型燃料电池） ( H 2 O 2 fuel cell ) Energy conversion machine

recycling stations of waste cells

What did Mrs. Green suffer from?

1. Which reaction can be designed as primary battery? A. NaOH + HCl = NaCl + H 2 O B. CaO + H 2 O = Ca(OH) 2 C. Cu + 2AgNO 3 = Cu(NO 3 ) 2 + 2Ag D. Zn + 2FeCl 3 = ZnCl 2 + 2FeCl 2 Ex ercise C、DC、D ( ) The essence of primary battery is redox reaction.

A H 2 SO 4 (aq) B Cu C H 2 SO 4 (aq) D C uSO 4 (aq) E 无水乙醇 alcohol ( 酒精 ) F H 2 SO 4 (aq) Yes No C