Final answer:
The chemical equation CO + 3H2 ⇌ CH4 + H2O represents a synthesis reaction, where two substances combine to form a single product, and it is also reversible.
Step-by-step explanation:
The chemical equation CO + 3H2 ⇌ CH4 + H2O represents a type of chemical reaction known as a synthesis reaction. In this particular reaction, carbon monoxide (CO) and hydrogen gas (H2) combine to form methane (CH4) and water (H2O). A synthesis reaction is characterized by the combination of two or more substances to form a single product.
It is important to note that the presence of the double arrow (⇌) also indicates that the reaction is reversible, meaning that it can proceed in both the forward and reverse directions under certain conditions.