5.2.1 Balancing Chemical Equations

Cards (32)

  • What are reactants in a chemical equation?
    Substances that undergo change
  • Products are substances formed from the reactants
  • Writing an unbalanced chemical equation requires the correct chemical formulas of all reactants and products.
  • Steps to write an unbalanced chemical equation
    1️⃣ Identify reactants and products
    2️⃣ Write the chemical formulas
    3️⃣ Indicate the physical states
  • What is the unbalanced chemical equation for the reaction of methane with oxygen?
    CH_{4(g)} + O_{2(g)} \rightarrow CO_{2(g)} + H_{2}O_{(l)}</latex>
  • Reactants begin the reaction and are transformed into new substances
  • What are the reactants in the reaction CH4+CH_{4} +2O2→CO2+ 2O_{2} \rightarrow CO_{2} +2H2O 2H_{2}O?

    Methane and oxygen
  • Balancing a chemical equation ensures the conservation of mass
  • What is the purpose of coefficients in a chemical equation?
    To balance the number of atoms
  • Steps to balance the equation H2+H_{2} +O2→H2O O_{2} \rightarrow H_{2}O

    1️⃣ Adjust oxygen on the product side
    2️⃣ Adjust hydrogen on the reactant side
  • The balanced chemical equation for H_{2} + O_{2} \rightarrow H_{2}O</latex> is 2H2+2H_{2} +O2→2H2O O_{2} \rightarrow 2H_{2}O.
  • What are the two main parts of a chemical equation?
    Reactants and products
  • Steps to balance the chemical equation H2+H_{2} +O2→H2O O_{2} \rightarrow H_{2}O

    1️⃣ Begin with the unbalanced equation: H2+H_{2} +O2→H2O O_{2} \rightarrow H_{2}O
    2️⃣ Adjust oxygen on the product side: H2+H_{2} +O2→2H2O O_{2} \rightarrow 2H_{2}O
    3️⃣ Adjust hydrogen on the reactant side: 2H2+2H_{2} +O2→2H2O O_{2} \rightarrow 2H_{2}O
  • Oxygen is balanced in the unbalanced equation H_{2} + O_{2} \rightarrow H_{2}O</latex>
    False
  • Adjusting the hydrogen on the reactant side results in the balanced equation 2H2+2H_{2} +O2→2H2O O_{2} \rightarrow 2H_{2}O, ensuring that the number of atoms of each element is equal on both sides.
  • Match the element with its number of atoms on the reactant and product sides of the balanced equation 2H2+2H_{2} +O2→2H2O O_{2} \rightarrow 2H_{2}O

    Hydrogen ↔️ 4 on both sides
    Oxygen ↔️ 2 on both sides
  • The balanced chemical equation for the reaction of hydrogen and oxygen is 2H2+2H_{2} +O2→2H2O O_{2} \rightarrow 2H_{2}O, which illustrates the principle of conservation of mass.
  • Reactants are substances formed as a result of a chemical reaction.
    False
  • Match the component with its role in a chemical reaction.
    Reactants ↔️ Begin the reaction, transformed into new substances
    Products ↔️ Substances formed from the reactants
  • In the reaction CH4+CH_{4} +2O2→CO2+ 2O_{2} \rightarrow CO_{2} +2H2O 2H_{2}O, the reactants are CH_{4}</latex> and O2O_{2}, while the products are CO2CO_{2} and H2OH_{2}O.oxygen
  • Steps to write an unbalanced chemical equation.
    1️⃣ Identify reactants and products
    2️⃣ Write chemical formulas
    3️⃣ Indicate states using symbols
  • The symbol (g) indicates a substance is in a gaseous state.
  • The unbalanced chemical equation for methane reacting with oxygen is CH4(g)+CH_{4(g)} +O2(g)→CO2(g)+ O_{2(g)} \rightarrow CO_{2(g)} +H2O(l) H_{2}O_{(l)}.water
  • Balancing chemical equations maintains conservation of mass.
  • To count atoms in a chemical equation, consider the stoichiometric coefficients and subscripts.
  • In the balanced equation CH4+CH_{4} +2O2→CO2+ 2O_{2} \rightarrow CO_{2} +2H2O 2H_{2}O, the number of oxygen atoms on the reactant side is four.
  • An equation is balanced if the number of atoms of each element is the same on both sides.
  • Steps to balance a chemical equation using coefficients.
    1️⃣ Begin with the unbalanced equation
    2️⃣ Adjust oxygen atoms on the product side
    3️⃣ Adjust hydrogen atoms on the reactant side
  • The balanced equation for the reaction of hydrogen and oxygen is2H_{2} + O_{2} \rightarrow 2H_{2}O</latex>, which uses coefficients to ensure atom balance.
  • Balancing chemical equations requires repeating the process for all elements until each is balanced.
  • Balancing the equation C3H8+C_{3}H_{8} +O2→CO2+ O_{2} \rightarrow CO_{2} +H2O H_{2}O requires using the coefficient five for oxygen.
  • Match the step with its action in balancing a chemical equation.
    Count atoms on both sides ↔️ Ensure equal atoms of each element
    Adjust coefficients ↔️ Balance the number of molecules