Answer: Both A and R true; R correctly explains A.
- A Both A and R true; R correctly explains A
- B A is true but R is false
- C A is false but R is true
- D Both A and R true; R does not explain A
Correct answer: A. Both A and R true; R correctly explains A
Explanation: By Le Chatelier, heating an endothermic reaction shifts it forward, raising K<sub>c</sub>; R correctly explains A.
As the reaction proceeds, reactant concentration falls and product concentration rises until both level off at equilibrium.
Concept context
When forward and reverse reaction rates are equal, equilibrium is reached. Learn about Kc, Kp, Le Chatelier's principle, and acid-base equilibria, including pH, buffer solutions, and solubility product.