A number of cells can be connected in series to make a , which has a higher voltage than a single cell. reactant A substance that reacts together with another substance to form products during a chemical reaction. is used up. When this happens, we say the battery ‘goes flat’.
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Explain how the reaction that takes place in a rechargeable battery is different to that in an alkaline battery. When hydrogen enters the fuel cell it becomes oxidised. Explain what happens to the hydrogen in the fuel cell after it has become oxidised. Write a half equation for the reaction between hydrogen and oxygen at the cathode.
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AQA Chemistry GCSE - Energy Changes. Zinc is more reactive than copper, so it has a greater tendency to lose electrons. This means that electrons move from the zinc rod to the copper via the wire. These electrons form the current.
A group of cells connected this way in series is called a battery. The voltage of a battery is calculated by adding up the voltages of the individual cells in the series. For example, if the cells in the diagram above have voltages of 2.3text{ V}, …