Multiple Choice
Which of the following is the balanced molecular equation for the reaction between nitric acid (HNO3) and magnesium hydroxide (Mg(OH)2)?
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3. Chemical Reactions
Balancing Chemical Equations
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Which of the following is the correctly balanced equation for the reaction: H2O2(aq) + ClO2(aq) → ClO2(aq) + O2(g)?
A
H2O2(aq) + ClO2(aq) → ClO2(aq) + O2(g)
B
H2O2(aq) + 2 ClO2(aq) → 2 ClO2(aq) + O2(g)
C
H2O2(aq) + 2 ClO2(aq) → 2 ClO2(aq) + 2 O2(g)
D
H2O2(aq) + ClO2(aq) → ClO2(aq) + 2 O2(g)
Verified step by step guidance1
Identify the reactants and products in the given chemical equation: Reactants are H2O2(aq) and ClO2(aq), and products are ClO2(aq) and O2(g).
Write the unbalanced chemical equation: H2O2(aq) + ClO2(aq) → ClO2(aq) + O2(g).
Count the number of each type of atom on both sides of the equation. For example, count the number of hydrogen, oxygen, and chlorine atoms in the reactants and products.
Adjust the coefficients of the reactants and products to balance the number of each type of atom on both sides of the equation. Start by balancing the atoms that appear in only one reactant and one product, such as chlorine in ClO2.
Check that the total number of each type of atom is the same on both sides of the equation. If necessary, adjust the coefficients again to achieve balance, ensuring that the smallest whole number coefficients are used.
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