The density of a solid reactant affects the rate of a reaction.
true
false

The correct answer is "True".

Explanation:

The rate of a reaction is affected by multiple factors, including the density of a solid reactant. The higher the density of a solid reactant the higher the rate of a reaction will be. A higher density of reactant increases the probability that collisions take place, and the more collisions the more reactions will occur.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.