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Hydrogen as a Reactant
Some reactions using hydrogen gas :
1. With Group I metals e.g. sodium
This reaction occurs when hydrogen gas is bubbled through liquid sodium.
With Group V elements e.g. nitrogen
This is a reversible reaction. To make it move to the right there has to be increased pressure (250 times the pressure of the atmosphere) and this elevates the temperature to 500°C. A catalyst is also used. In this case the catalyst is made from iron. 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 hydrogen and nitrogen to its surface where the are closer together and react more easily.
3. With Group VI elements e.g. oxygen
A mixture of oxygen gas and hydrogen gas, once ignited, will burn easily to form water.
4. With Group VII elements e.g. chlorine
The reaction between these two gases can be explosive if there is a lot of sunlight.
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