Correct Option
The correct option is Law of conservation of mass.
Explanation
Chemical equations represent chemical reactions using symbols and formulas. For an equation to be scientifically valid, it must adhere to fundamental laws governing matter, specifically regarding the quantity of matter involved in the reaction.
Detailed Analysis
- Law of Conservation of Mass: Proposed by Antoine Lavoisier, this law states that mass can neither be created nor destroyed in a chemical reaction. Therefore, the total mass of the elements present in the products must equal the total mass of the elements present in the reactants. To satisfy this, the number of atoms of each element must remain constant on both sides of the equation. This is the fundamental basis for balancing chemical equations.
- Law of Definite Proportions: This law states that a chemical compound always contains its component elements in a fixed ratio by mass. While relevant to stoichiometry, it is not the primary reason for balancing the equation itself.
- Law of Multiple Proportions: This law deals with elements combining to form more than one compound. It explains the ratios of masses but does not dictate the requirement for balancing equations.
- Law of Gravitation: This is a physical law governing the attraction between masses and has no direct application to chemical stoichiometry or equation balancing.
Key Takeaway: A skeletal chemical equation is unbalanced; it must be balanced to satisfy the Law of Conservation of Mass, ensuring that the number of atoms for each element is conserved throughout the reaction.