Question

Answer the following:

(a) Why solid carbon dioxide is called dry ice? Give its uses.

(b) Why is dry ice more effective for cooling purposes than ordinary ice?

(c) Why is dry ice stored under high pressure?

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Answer 1

Answer:

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⭐Solid carbon dioxide undergoes sublimation and that's why it directly changes into gaseous carbon dioxide .It does not melt like water ice cube and changes into liquid form .So,it is termed

as "Dry ice".

⭐Uses of Dry ice:-

⏩it is used for deep freezing of food .

⏩used to keeping ice cream cold .

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⭐it is more effective in cooling because it produces a lower temperature less than -80°C which was is freezing point .It means it produces a lower temperature less than its freezing point .So,it is more effective in cooling.

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⭐it is stored under high pressure to prevent to get back from its gaseous state (carbon dioxide).If the temperature is released then the solid carbon dioxide changes to gaseous carbon dioxide.

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Answer 2

Explanation:

Solid Carbon dioxide is called as Dry ice. It is used to deep freeze the food and keep the ice cream cold. Solid carbon dioxide is stored under high pressure. This is because on decreasing the pressure on solid carbon dioxide , it gets converted directly into carbon dioxide gas.