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In a chemical reaction, which condition causes the system to shift from the products side back toward the reactants side?

1. When the reaction quotient (Q) is greater than the equilibrium constant (Kc)
2. When the reaction quotient (Q) is less than the equilibrium constant (Kc)
3. When the reaction quotient (Q) equals the equilibrium constant (Kc)
4. When none of these conditions are met

Correct answer: When the reaction quotient (Q) is greater than the equilibrium constant (Kc)

Solution

When Q > Kc, the reaction proceeds from right to left to reach equilibrium, as the system tries to reduce the concentration of products and increase reactants.

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