Question

unit exam - states of matter and phase changes
sublimation is when a solid gains energy and becomes a gas, skipping the change to liquid.
sublimation occurs when heat increases. it causes the particles to move so fast that they separate and become a gas.
solid gas
heat added
examples of sublimation include dry ice, freeze - drying, and mothballs. dry ice is solid carbon dioxide (co2) that does not melt into a liquid at room temperature; it sublimates into a gas. foods that are freeze - dried remove water from frozen foods without the water ever becoming liquid, going straight to water vapor. mothballs used to be made of a chemical called naphthalene, which sublimated at room temperature. this caused mothballs to decrease in size over time.
choose the correct answer.
what is an example of sublimation?
freeze - drying food by turning ice directly into water vapor
ice melting into liquid water
a puddle evaporating into water vapor

Explanation:

Sublimation is the process where a solid directly changes to a gas without passing through the liquid - state. Freeze - drying food by turning ice directly into water vapor is an example of sublimation. Ice melting into liquid water is a process of melting (solid to liquid), and a puddle evaporating into water vapor is a process of evaporation (liquid to gas).

Answer:

Freeze - drying food by turning ice directly into water vapor