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Hydrogen as a Product of Reactions
Two reactions that make hydrogen gas
1. Reacting methane gas (natural gas) with water (as steam)
This is a reversible reaction. To make it move to the right there has to be increased pressure (30 times the pressure of the atmosphere) and this elevates the temperature to 900°C. A catalyst is also used. In this case the catalyst is made from the metals nickel and chromium. The catalyst is not changed during the reaction but it speeds up the rate of the reaction. In this case that is because it adsorbs the molecules of methane and water to its surface where the are closer together and react more easily.
2. From the reaction of a metal with dilute acid
The metals used to prepare hydrogen gas are usually zinc, magnesium, calcium or iron. Any dilute acid can be used
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