Sublimation and Deposition Processes

The video explores whether sublimation is endothermic or exothermic. Sublimation, the transition from solid to gas without a liquid phase, is endothermic as it requires energy input. The reverse process, deposition, is exothermic, releasing energy as gas turns back into solid. The video uses iodine as an example to demonstrate these processes.

What is the main characteristic of an endothermic process?

• It releases energy.

• It absorbs energy.

• It remains energy-neutral.

• It changes energy form.

What phase change occurs during sublimation?

• Liquid to gas

• Solid to gas

• Solid to liquid

• Gas to liquid

What is observed when iodine undergoes sublimation?

• Formation of a liquid phase

• Release of heat

• Formation of a purple gas

• Cooling of the surroundings

Why is sublimation considered an endothermic process?

• It involves a liquid phase.

• It occurs spontaneously without energy input.

• It requires energy to break intermolecular forces.

• It releases heat to the surroundings.

What is the role of heat in the sublimation of iodine?

• It breaks intermolecular forces.

• It forms a liquid phase.

• It condenses the iodine.

• It cools the iodine.

What is the reverse process of sublimation called?

• Melting

• Deposition

• Evaporation

• Condensation

What happens to energy during deposition?

• Energy is absorbed.

• Energy is released.

• Energy remains constant.

• Energy is converted to light.

Which of the following is an example of an exothermic process?

• Sublimation

• Deposition

• Melting

• Boiling

What is the result of deposition in terms of phase change?

• Liquid to solid

• Gas to liquid

• Solid to gas

• Gas to solid