Multiple Choice
For the following UNBALANCED chemical equation: _____ C2H6(g) + _____ O2(g) → _____ CO2(g) + _____ H2O(g), what are the correct coefficients to balance the equation?
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3. Chemical Reactions
Balancing Chemical Equations
Multiple Choice
What is the balanced chemical equation for the reaction between HI(aq) and NaOH(aq)?
A
HI(aq) + 2NaOH(aq) → NaI(aq) + 2H2O(l)
B
2HI(aq) + NaOH(aq) → NaI(aq) + 2H2O(l)
C
HI(aq) + NaOH(aq) → NaI(aq) + H2O(l)
D
2HI(aq) + 2NaOH(aq) → 2NaI(aq) + H2O(l)
Verified step by step guidance1
Identify the reactants and products in the chemical reaction. The reactants are HI(aq) and NaOH(aq), and the products are NaI(aq) and H2O(l).
Write the unbalanced chemical equation using the chemical formulas of the reactants and products: HI(aq) + NaOH(aq) → NaI(aq) + H2O(l).
Check the number of atoms of each element on both sides of the equation to ensure they are equal. In this case, there is 1 hydrogen atom, 1 iodine atom, 1 sodium atom, and 1 oxygen atom on both sides.
Since the number of atoms of each element is already balanced, the equation HI(aq) + NaOH(aq) → NaI(aq) + H2O(l) is the balanced chemical equation.
Verify that the physical states of the compounds are correctly indicated: HI and NaOH are aqueous (aq), NaI is aqueous (aq), and H2O is liquid (l).
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