Multiple Choice
Which of the following lists the reactants in the chemical equation: HCl(aq) + NaHCO_3(aq) → CO_2(g) + H_2O(l) + NaCl(aq)?
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3. Chemical Reactions
Balancing Chemical Equations
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In a balanced chemical equation, the molar ratio of two reactants is determined from the:
A
coefficients in the equation
B
physical states of the reactants
C
subscripts in the chemical formulas
D
molar masses of the reactants
Verified step by step guidance1
Understand that a balanced chemical equation shows the relative amounts of reactants and products involved in a reaction.
Recognize that the molar ratio between two reactants is the ratio of their coefficients in the balanced chemical equation.
Recall that coefficients are the numbers placed before chemical formulas to balance the number of atoms on each side of the equation.
Note that subscripts in chemical formulas indicate the number of atoms in a molecule, not the ratio of reactants in the reaction.
Understand that physical states and molar masses do not determine the molar ratio; only the coefficients in the balanced equation do.
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