chem cells/fuel

what do cells contain,why

Cells contain chemicals which react to produce electricity.

what does the voltage produced by a cell depend on?

The voltage produced by a cell depends on ie the electrode and electrolyte.

how can we produce electricity

if we take 2 different metals and place them into an electrolyte we can produce electricity

hwo do we make simple cell?

A simple cell can be made by connecting two different metals in contact with an electrolyte.

what do batteries consist of and why?

Batteries consist of two or more cells connected together in series to provide a greater voltage.

non recharble cells and batteries what stops and why

In non-rechargeable cells and batteries the chemical reactions stop when one of the reactants has been used up.

what type of batteries are non rechargable

Alkaline batteries are non-rechargeable.

what type of batteries are rechargable

Rechargeable cells and batteries can be recharged because the chemical reactions are reversed when an external electrical current is supplied

Fuel cells are supplied by an external source of fuel (eg hydrogen) and oxygen or air. The fuel is oxidised electrochemically within the fuel cell to produce a potential difference.

The overall reaction in a hydrogen fuel cell involves the oxidation of hydrogen to produce water.

Hydrogen fuel cells offer a potential alternative to rechargeable cells and batteries.

a cell can only produce electricity for a certain period of time,eventually the chemical in the cell runs out and the reaction stops

cells only produce electricity if we use metals with different reactivities

the greater the difference between the reactivity of the metals the greater the potential difference produced by the cell

why ae alkaline batteries non rechargabel?

in alkaline batteries at some point the reactants in the batteries run out and no more electricitiy is produced,there is no way that we can reverse these reactions so they are non rechargable batteries

why can rechargable batteries be recharged?

rechargabel batteries can be rechagred we cna reverse the chemical reactions when we apply an electrical current

in a fuel cell we react to fuel like hydrogen with pure oxygen or air ,inside the fuel cell a chem reaction takes place producing an electric current

whats the only watse product in hydrogen fuel cell

water is the only waste product in hydrogen fuel cell

main adv of hydrogen fuel cells

hydrogen fuel cells produce electricity as long as you provide hydrogen

disadv1 of rechargble batteries

rechargable batteries run out and need to be recharged

adv2 of hydrogen fuel cells

hydrogen fuel cells dont get less efficient the longer they run

disadv2 of rechargble batteries

rechargble batteries can store less eelctricity the more charging cycles they go through and eventually need to be replaced

adv 3 of hydrogen fuel cells what source can it be

hydrogen fuel cells can be a source of drinkable water e.g on space craft

disadv1 of hydrogen fuel cells

hydrogen fuel cells run on hydrogen which is an expolsive gas and is very difficult to store safley

adv 1 of rechargable batteries

no dangerous fuels required with rechargable batteries some types of rechargabel batteries can catch fire if not manafactured correctly

disadv 2hydrogen fuel cells

hydrogen fuel cells produce a relatively low potential difference or voltage so several are needed together

adv 2rechargable batteries

rechargable batteries can produce a greater potential diff than hydrogen fuel cell