Final answer:
The reaction CH4(g) + H2O(g) → CO(g) + 3H2(g) is indeed a redox reaction, as there is a transfer of electrons that changes the oxidation states of carbon from -4 to +2.
Step-by-step explanation:
Yes, the reaction CH4(g) + H2O(g) → CO(g) + 3H2(g) is a redox reaction. In a redox reaction, there is a transfer of electrons between species, which changes the oxidation states of the atoms involved. To determine whether it is a redox reaction, we look at the change in oxidation numbers for the elements in the reactants and products.
Methane, CH4, is being oxidized to carbon monoxide, CO, as the oxidation state of carbon changes from -4 in CH4 to +2 in CO. Water, H2O, is being reduced as part of this reaction, which results in the production of hydrogen gas, H2.
This type of reaction can occur during the industrial process known as steam reforming, where large quantities of hydrogen gas are produced from natural gas. This hydrogen is then often used for the industrial synthesis of other chemicals, such as ammonia.