Q20 of 160 Page 36

State one condition necessary to liquefy gases (other than applying high pressure).

When a gas is cooled enough, then its particles lose so much kinetic energy that they slow down, move closer together until they start being attracted to each other, and form a liquid.


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18

What is the common name of solid carbon dioxide?

 19

Why is solid carbon dioxide known as dry ice?

 21

State whether the following statement is true or false:

Solid carbon dioxide is stored under low pressure.

 22

What is the chemical name of dry ice?