What happens to solid carbon dioxide (dry ice) when the pressure is decreased to 1 atmosphere?
Show answer & explanation
Correct answer: A
Explanation
Correct Answer:
It directly converts into gas.
Explanation:
When pressure is reduced to 1 atmosphere, solid carbon dioxide (dry ice) does not melt into a liquid. Instead, it changes directly from solid to gas. This process is called Sublimation.
Key Points:
• Substance: Solid carbon dioxide (Dry Ice)
• Process: Sublimation
• Change: Solid → Gas (without liquid state)
• Pressure: 1 atmosphere
• Feature: No liquid state is formed
Additional Facts:
• Dry ice has a temperature of about −78.5°C.
• It is used for cooling and creating fog effects.
• CO₂ does not remain stable in liquid form at normal atmospheric pressure.
Important Questions for Exam:
Why does solid CO₂ directly turn into gas?
Answer: Due to Sublimation
What is sublimation?
Answer: Direct change from solid to gas
Dry ice is the solid form of what?
Answer: Carbon dioxide
Does CO₂ form a liquid at normal pressure?
Answer: No