Reactants:
* Starting materials: These are the substances that are present at the beginning of a chemical reaction.
* Undergo transformation: They are transformed into new substances during the reaction.
* Located on the left side: In a chemical equation, reactants are typically written on the left side of the arrow.
Products:
* Resulting substances: These are the substances that are formed as a result of the chemical reaction.
* Created by the reaction: They are created from the rearrangement of atoms within the reactants.
* Located on the right side: Products are typically written on the right side of the arrow in a chemical equation.
Relationship:
* Transformation: Reactants are transformed into products by breaking and forming chemical bonds.
* Conservation of mass: The total mass of the reactants must equal the total mass of the products. This is the law of conservation of mass.
* Stoichiometry: The coefficients in a balanced chemical equation represent the relative amounts (moles) of reactants and products involved in the reaction.
Example:
Consider the combustion of methane:
CH₄ (g) + 2O₂ (g) → CO₂ (g) + 2H₂O (g)
* Reactants: Methane (CH₄) and oxygen (O₂)
* Products: Carbon dioxide (CO₂) and water (H₂O)
In this reaction, methane and oxygen react to form carbon dioxide and water. The chemical bonds in the reactants are broken, and new bonds are formed in the products. The number of atoms of each element remains the same on both sides of the equation, demonstrating the law of conservation of mass.
Key takeaways:
* Reactants are the starting materials of a reaction, and products are the substances formed as a result.
* The relationship between reactants and products is a transformation driven by the breaking and forming of chemical bonds.
* The law of conservation of mass governs the relationship, ensuring that mass is neither created nor destroyed during a chemical reaction.
