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Which of the following statements is true for a balanced chemical equation?
The total number of moles is the same on both sides.
The total mass of molecules is unequal on both sides.
The total number of atoms of each element is the same on both sides.
The total number of molecules is the same on both sides.
The total number of atoms of each element is the same on both sides.
A balanced chemical equation follows the Law of Conservation of Mass, which states that matter is neither created nor destroyed during a chemical reaction. Consequently, the number of atoms of each element must remain identical on both the reactant and product sides.
A balanced chemical equation follows the Law of Conservation of Mass, which states that matter is neither created nor destroyed during a chemical reaction. Consequently, the number of atoms of each element must remain identical on both the reactant and product sides.
Think of it like a kitchen recipe: if you start with two slices of bread and one slice of cheese, you must end up with a sandwich containing exactly those same ingredients; you cannot have more or fewer atoms of bread or cheese after the assembly is complete.
Remember 'M-A-T-H': Mass And Total-atoms Harmonized.
MassreactantsтАЛ=MassproductsтАЛ тАФ The Law of Conservation of Mass
n=MmтАЛ тАФ Relationship between moles, mass, and molar mass
During a chemical reaction, atoms are rearranged to form new substances, but they are not altered or destroyed. To satisfy the Law of Conservation of Mass, the total count of each specific atom type must be equal on both sides of the arrow. This is achieved by adjusting stoichiometric coefficients (the numbers placed in front of chemical formulas).
Chemical equations represent the conservation of mass.
Stoichiometric coefficients are the only numbers modified to balance an equation.
Subscripts in chemical formulas (e.g., the '2' in H2тАЛO) should never be changed while balancing.
Balancing ensures the reaction stoichiometry reflects reality.
Enables accurate prediction of reactant quantities needed.
Allows calculation of the theoretical yield of products.
Does not indicate the rate of reaction.
Does not provide information about the reaction mechanism.
Industrial synthesis (e.g., Haber process for ammonia).
Stoichiometric calculations in laboratory analytical chemistry.
Option A is incorrect because moles are only conserved if the coefficients sum to the same value, which is not required.
Option D is incorrect because the number of molecules often changes during a reaction (e.g., 2H2тАЛ+O2тАЛтЖТ2H2тАЛO involves 3 reactant molecules becoming 2 product molecules).
A balanced equation is the mandatory starting point for any chemical stoichiometry problem.
C is correct тАФ In a balanced chemical equation, the Law of Conservation of Mass dictates that the total number of atoms of each element must be equal on both sides.
When balancing equations, always start by balancing the element that appears in the fewest compounds, and save Oxygen and Hydrogen for last as they appear most frequently.
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