Which clue can be used to identify a chemical reaction as a replacement reaction? the reaction has two reactants with ions that seem to switch places. the reaction has a single reactant that changes into two or more products. the reaction involves oxygen reacting with a hydrocarbon and giving off heat. the reaction involves a single product forming from two or more reactants.

Option (a) is the correct answer.

Explanation:

A replacement reaction is a chemical reaction in which a more reactive atom or ion displaces least reaction atom or ion.

For example,

Here, Na gets replaced by H atom and Cl ion gets replaced by OH ion.

Whereas when teo or more reactants combine to forms a single product then that reaction is a synthesis reaction and not a displacement reaction because two different ions or atoms combine together to form a single product.

For example, is a synthesis reaction.

Thus, we can conclude that the reaction has two reactants with ions that seem to switch places is a clue that can be used to identify a chemical reaction as a replacement reaction.

this could be newton#'s law of cooling. the cooling curve is exponential