Rico is doing an experiment. He makes a solution of calcium carbonate in a beaker of 200 mL of water at room temperature (25 °C). He adds a small amount of lemon juice to the

solution and a chemical reaction begins. Rico reduces the temperature of the solution by

10 °C by adding ice. As the solution cools, what will happen to the chemical reaction?

The chemical reaction will stop suddenly.

There will no change in the rate of the chemical reaction.

The chemical reaction will slow as the water cools.

The speed of the chemical reaction will increase as the water cools.

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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.