Question

which statement correctly describes a chemical reaction?
○ reactants come out of a reaction.
○ energy is always released.
○ bonds between atoms break and reform.
○ products go into a reaction.

Explanation:

• For the first option: Reactants are the substances that go into a reaction, not come out. Products come out, so this is incorrect.
• For the second option: In chemical reactions, energy can be released (exothermic) or absorbed (endothermic), so it's not always released. This is incorrect.
• For the third option: In a chemical reaction, chemical bonds between atoms in reactants break, and new bonds form to create products. This accurately describes a chemical reaction.
• For the fourth option: Products are the substances that come out of a reaction, while reactants go into a reaction. So this is incorrect.

Answer:

C. Bonds between atoms break and reform.