At which temperature does pure ice melt under standard atmospheric pressure (1 atm)?

• A. 0 °C
• B. 100 °C
• C. 32 °C
• D. -10 °C

Answer: (A)

Verified step by step guidance

1. Understand that the melting point of a substance is the temperature at which it changes from solid to liquid at a given pressure.
2. Recognize that the problem specifies standard atmospheric pressure, which is 1 atm.
3. Recall that for pure water (H\_2O), the melting point under 1 atm pressure is a well-known physical constant.
4. Note that the melting point of ice is commonly given as 0 °C, which is equivalent to 32 °F, but the problem asks for the temperature in °C.
5. Conclude that under standard atmospheric pressure, pure ice melts at 0 °C.