Which statement is true regrading a chemical reaction?

Answer 1

Here is a true statement regarding a chemical reaction:

A chemical reaction involves the rearrangement of atoms to form new substances.

This fundamental concept is central to the definition of a chemical reaction. In any chemical reaction, the bonds between atoms in the reactants are broken, and new bonds are formed to create the products. Despite this transformation, one of the key principles of chemical reactions is the conservation of mass; the total mass of the reactants equals the total mass of the products because the number of atoms of each element remains the same, in accordance with the law of conservation of mass.

Other true statements about chemical reactions include:

- Chemical reactions can be exothermic (releasing energy) or endothermic (absorbing energy).
- The rate of a chemical reaction can be affected by factors such as temperature, concentration, surface area, and the presence of catalysts.
- A chemical equation represents a chemical reaction using symbols and formulas, and it must be balanced to reflect the law of conservation of mass.
- In a chemical reaction, reactants are the starting materials that undergo change, and products are the new substances formed as a result of the reaction.

Understanding chemical reactions is fundamental to the study of chemistry and is critical for a wide range of scientific and industrial processes.