Question

the original molecules that enter a chemical reaction are called
multiple choice
○ products.
○ reactants.
○ intermediates
○ catalysts.

Explanation:

To solve this, we recall the definitions:

• Products are the substances formed after a reaction.
• Reactants are the original substances that participate (enter) a chemical reaction.
• Intermediates are formed and consumed during the reaction, not the original entering molecules.
• Catalysts speed up reactions but are not the original reacting molecules.

So the original molecules entering a reaction are reactants.

Answer:

B. reactants (assuming the second option is labeled B; if the options are labeled differently, adjust the label but the text is "reactants")