Multiple Choice
Which of the following is the balanced chemical equation for the fermentation of sucrose (C12H22O11) by yeast, where it reacts with water to form ethyl alcohol (C2H5OH) and carbon dioxide (CO2)?
3. Chemical Reactions
Balancing Chemical Equations
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Which of the following is the balanced complete ionic equation for the reaction K2SO4(aq) + CaI2(aq) → CaSO4(s) + KI(aq)?
A
2K+(aq) + SO4^2-(aq) + Ca^2+(aq) + 2I-(aq) → CaSO4(s) + K2I2(aq)
B
K2SO4(aq) + CaI2(aq) → CaSO4(s) + 2KI(aq)
C
2K+(aq) + SO4^2-(aq) + Ca^2+(aq) + 2I-(aq) → CaSO4(s) + 2K+(aq) + 2I-(aq)
D
K2SO4(aq) + CaI2(aq) → CaSO4(s) + K+(aq) + I-(aq)
Verified step by step guidance1
Identify the reactants and products in the given chemical equation: K2SO4(aq) + CaI2(aq) → CaSO4(s) + KI(aq).
Write the dissociation of each aqueous compound into its ions: K2SO4(aq) dissociates into 2K+(aq) and SO4^2-(aq); CaI2(aq) dissociates into Ca^2+(aq) and 2I-(aq).
Write the complete ionic equation by replacing each aqueous compound with its dissociated ions: 2K+(aq) + SO4^2-(aq) + Ca^2+(aq) + 2I-(aq) → CaSO4(s) + K+(aq) + I-(aq).
Identify the spectator ions, which are ions that appear on both sides of the equation and do not participate in the formation of the precipitate: In this case, K+(aq) and I-(aq) are spectator ions.
Write the net ionic equation by removing the spectator ions from the complete ionic equation: SO4^2-(aq) + Ca^2+(aq) → CaSO4(s).
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