Question

18. What is the common name of solid carbon dioxide ?
19. Why is solid carbon dioxide known as dry ice?
20. State one condition necessary to liquefy gases (other than appl​

Answer 1

Answer:

18. Dry ice is the common name of solid carbon dioxide.

19.solid carbon dioxide known as dry ice because it does not melt into a liquid when heated; instead, it changes directly into a gas (a process known as sublimation).

20.Cooling or lowering the temperature is necessary to liquefy gases, other than applying high pressure.

Hope this will help you...