What happens to solid carbon dioxide (dry ice) when the pressure is decreased to 1 atmosphere?
It sublimates directly into a gas.
Solid carbon dioxide is commonly called dry ice because it does not melt into a wet liquid under normal conditions.
At a pressure of 1 atmosphere, carbon dioxide cannot exist as a liquid; it changes directly from the solid state to the gaseous state.
This direct conversion of a solid into a gas without passing through the liquid phase is called sublimation.
Dry ice sublimates at about -78.5 degrees Celsius at 1 atmosphere, which is why it produces a smoky, fog-like effect.
Liquid carbon dioxide forms only under higher pressures (above about 5.1 atmospheres), so 'melts into a liquid' is incorrect here.
Because the substance neither stays solid nor freezes further, the correct description is direct sublimation into a gas.
Therefore, the correct answer is It sublimates directly into a gas.
Similar Questions
Which of the following is NOT a main factor affecting the rate of evaporation?
The forces of attraction between the particles are maximum in _____ and minimum in _____.
Important Questions from States of Matter
Which is correct statement ?
According to Charle's Law, which of the following is constant?
Which of the following statements is/are correct?
I. Mass vapor is obtained in the air by evaporation and transpiration.
II. Water circulation between the oceans and the water bodies is called the water cycle.
Which of the following statements is not correct regarding matter?
What is the term used to refer to the process of conversion of water vapour back to water?
