Mole Unit Assessment Q1. We observed the following reaction in the Reaction in a Bag activity:
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CaCl2 (aq) + 2Nahco, (aq) + phenol red (basic form)
CaCO3 (s) + 2NaCl (aq) + H20 (aq) + CO2 (aq) + phenol red (acidic form)
What are the reagent(s) in this reaction?

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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.