A well-known physical change is melting of ice. The melting of ice is favoured by:
Correct answer: A. Low Pressure, High Temperature
- A. Low Pressure, High Temperature
- B. Low Temperature, High Pressure
- C. High Temperature, High Pressure
- D. Low Temperature, Low Pressure
Explanation
Low pressure reduces the melting point of ice, and high temperature provides the energy needed to overcome the hydrogen bonds holding the ice structure together. This combination facilitates the transition from solid to liquid. Other combinations either stabilize the solid form or do not provide enough energy for melting, making them less effective in favoring the melting process.
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About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
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