Which of the following equations are balanced? Balance those that need it. a. CaC2 + 2 H2O → Ca(OH)2 +C2H2 b. C2H8N2 + 2 N2O4 → 2 N2 + 2 CO2 + 4 H2O c. 3 MgO + 2 Fe → Fe2O3 + 3 Mg d. N2O → N2 + O2

Ch.5 Classification & Balancing of Chemical Reactions

McMurry - Fundamentals of General, Organic, and Biological Chemistry 8th Edition

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McMurry 8th Edition

Ch.5 Classification & Balancing of Chemical Reactions

문제 27

5장, 문제 27

Which of the following equations are balanced? Balance those that need it.
a. CaC₂ + 2 H₂O → Ca(OH)₂ +C₂H₂
b. C₂H₈N₂ + 2 N₂O₄ → 2 N₂ + 2 CO₂ + 4 H₂O
c. 3 MgO + 2 Fe → Fe₂O₃ + 3 Mg
d. N₂O → N₂ + O₂

검증된 단계별 안내

Step 1: Understand the concept of a balanced chemical equation. A balanced equation has the same number of each type of atom on both sides of the reaction arrow. This ensures the law of conservation of mass is upheld.

Step 2: Analyze equation (a): CaC₂ + 2 H₂O → Ca(OH)₂ + C₂H₂. Count the atoms of each element on both sides. Calcium (Ca), carbon (C), hydrogen (H), and oxygen (O) should all be balanced. Verify if the number of atoms matches on both sides.

Step 3: Analyze equation (b): C₂H₈N₂ + 2 N₂O₄ → 2 N₂ + 2 CO₂ + 4 H₂O. Count the atoms of carbon (C), hydrogen (H), nitrogen (N), and oxygen (O) on both sides. Adjust coefficients if necessary to balance the equation.

Step 4: Analyze equation (c): 3 MgO + 2 Fe → Fe₂O₃ + 3 Mg. Count the atoms of magnesium (Mg), oxygen (O), and iron (Fe) on both sides. Adjust coefficients if needed to ensure the equation is balanced.

Step 5: Analyze equation (d): N₂O → N₂ + O₂. Count the atoms of nitrogen (N) and oxygen (O) on both sides. Adjust coefficients if necessary to balance the equation. Remember that diatomic molecules like O₂ and N₂ must be considered in their molecular form.

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주요 개념

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Chemical Equation

A chemical equation represents a chemical reaction using symbols and formulas. It shows the reactants on the left side and the products on the right, separated by an arrow. Balancing a chemical equation ensures that the number of atoms for each element is the same on both sides, adhering to the law of conservation of mass.

Balancing Equations

Balancing equations involves adjusting the coefficients of the reactants and products to ensure that the total number of atoms of each element is equal on both sides of the equation. This process may require trial and error, and it is essential for accurately representing the quantities involved in a chemical reaction.

Stoichiometry

Stoichiometry is the study of the quantitative relationships between the substances involved in a chemical reaction. It allows chemists to calculate the amounts of reactants needed and products formed, based on balanced equations. Understanding stoichiometry is crucial for predicting the outcomes of reactions and for practical applications in laboratory settings.