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Description: The 2-page bullet-point note gives an easy to understand view on the types of chemical cells and the chemical reactions involved in producing energy by the cells. The topic involves knowledge on redox reaction. A must have for easy understand of the chemical principle involved in chemical cells!
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Chemistry
chemical cells
Battery :two or more cells
Electromotive force/ voltage:
maximum potential diff
...
in reactivity ----- tendency to lose electrons )
discharge: conversion of chemical energy –to- electrical energy
Primary cells
Zinc-carbon cell
Alkaline manganese cell Silver oxide cell
1
...
5v
1
...
g
...
g
...
7
1
...
g
...
g
...
29 Simple chemical cell
2 metals in the same solution
-disadvantage : electrons may not flow through the external circuit
transfer of electron- directly between the electrodes
Half cell:
Salt bridge:
- a strip of filter paper soaked in a solution of electrolyte
- e
...
potassium nitrate (x react with the substance in the cell)
- x hydroxide
- allows ions of the soaked electrolyte – move from one cell to another
Reason we need it:
1
...
E
...
MgSO4( Mg) and CuSO4 (Cu)
- prevent mg ion (dissolve of Mg electrode) from entering the solution
- Prevent more electrons from entering the electrode
Functions:
1
...
provide ions to balance the charge
Daniell cell
- half cell separated by porous device
- porous device :
1
...
completed the circuit ( by allowing
Description: The 2-page bullet-point note gives an easy to understand view on the types of chemical cells and the chemical reactions involved in producing energy by the cells. The topic involves knowledge on redox reaction. A must have for easy understand of the chemical principle involved in chemical cells!