Sublimation

The video tutorial explains the process of sublimation, where a substance transitions directly from a solid to a gas without passing through a liquid stage. It uses dry ice as an example, describing how solid carbon dioxide sublimates when heated. The tutorial also covers the sublimation of water in comets as they approach the sun, which results in the release of dust particles and the formation of a comet's tail.

What is the process called when a substance transitions directly from a solid to a gas?

• Condensation

• Melting

• Evaporation

• Sublimation

What happens to the molecules at the surface of dry ice as its temperature increases?

• They remain in solid form

• They break free and form a gas

• They melt into water

• They condense into a liquid

Which of the following is a characteristic of sublimation in dry ice?

• It directly forms carbon dioxide gas

• It remains solid

• It turns into water before becoming gas

• It forms a visible liquid

What occurs when comets pass close to the sun?

• They freeze completely

• Water sublimates from solid to gas

• They become liquid

• They disintegrate

What is released from comets during sublimation near the sun?

• Ice particles

• Liquid water

• Dust particles

• Solid rock