Question

what is the process of sublimation? the electric company in your community sometimes hands out dry ice when a storm knocks out power. dry ice keeps groceries cold, but does not melt like ice. dry ice can change directly from a solid state to a gas state. this process is known as sublimation. dry ice is frozen carbon dioxide. its temperature is -78.5°c or lower. when it sublimes, it pulls energy from substances around it. this makes substances around it become cold. the energy it pulls weakens the attraction between the particles in the solid dry ice. when the attraction weakens enough, the solid changes into a gas. it does not melt into a liquid. dry ice is a substance that will change directly from a solid to a gas at atmospheric pressure. how are changes of state and temperature related? two things can happen to a substance when it gains or loses energy. either the temperature of the substance changes, or the state of the substance changes. during a change of state, the temperature of a substance will not change until the change of state is complete. take a close look at the figure below. the figure shows the effects and state changes that happen when energy is added to ice. changing the state of water graph description: the energy added to ice changes it to a liquid, then a gas. the temperature increases, except when a change of state occurs. the energy added during a change of state only breaks the attraction between particles. it does not raise the temperature of the water reading check 12. describe what occurs when a substance sublimes? say it demonstrate put an ice cube in the freezer compartment of a refrigerator. allow it to sit, undisturbed, for about two weeks. report to the class on how its size changed. take a look 13. describe what is the shape of the graph at the melting and freezing points of water? what does this shape tell you about the temperature?

Explanation:

Answer:

(12) The substance pulls energy from substances around it, which weakens the attraction between the particles in the solid. When the attraction weakens enough, the solid changes directly into a gas without melting into a liquid first.
(13) The shape of the graph at the melting and freezing points of water is a horizontal line. This shape tells you that the temperature remains constant during the change - of - state process at the melting and freezing points.