cells and batteries

What is a cell in chemistry?

A system that contains chemicals which react to produce electricity

Why should batteries not be put in household waste

Can ignite / explode

Can cause pollution to landfill sites

What factors affect voltage in cell

Temperature

Concentration (of electrolyte/solution)

Material of electrodes

out of copper iron and magnesium what two metal electrodes would produce the greatest voltage when used in a chemical cell and why

Copper and magnesium - as they have the largest difference in reactivity

Alkaline batteries are non rechargeable eventually why do they stop working

A reactant is used up - so reaction stops

Why can’t alkaline batteries not be recharged

The reaction isn’t reversible

How is electricity produced in a simple cell? .

One metal reacts with the electrolyte to produce electrons, which flow to the other metal, creating a current

Why do non rechargeable cells stop producing electricity

Reaction stops because one of the reactants is used up

Why are some fuel cells described as alkaline fuel cells

Because they contain OH- ions

What affects the voltage of a cell?

The difference in reactivity between the two metals used as electrodes.

What is a battery?

Two or more cells connected together.

How do you calculate the total voltage of a battery?

: Add the voltages of all the individual cells

What is the total voltage of cells A (0.90 V), B (0.34 V), and C (0.97 V) connected together?

0.90 + 0.34 + 0.97 = 2.21 V

How many 1.5 V cells are needed to power a torch requiring 4.5 V?

3 cells.