In a reaction in which A + B yields AB, the reaction is referred to as a _________.
A. decomposition reaction
B. double-replacement reaction
C. combustion reaction
D. composition reaction
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To determine the answer to this question, we need to understand the different types of chemical reactions and their definitions.
A. A decomposition reaction occurs when a single compound breaks down into two or more simpler substances. This does not match the given reaction as there is no breakdown of a compound.
B. A double-replacement reaction occurs when the positive ions in two ionic compounds swap places. This does not match the given reaction as there is no swapping of positive ions or ionic compounds.
C. A combustion reaction occurs when a substance reacts with oxygen to produce carbon dioxide and water, typically accompanied by the release of heat and light. This does not match the given reaction as there is no oxygen or production of carbon dioxide and water.
D. A composition reaction occurs when two or more substances combine to form a single compound. This matches the given reaction of A + B yielding AB, where A and B combine to form compound AB.
Based on the definitions, the correct answer is D. composition reaction.