sublimation

how sublime

Solid carbon dioxide is also called dry ice. Thats because when it gets warmer and changes state, it doesnt change to a liquid by melting. Instead, it changes directly to a gas without going through the liquid state. The process in which a solid changes directly to a gas is called sublimation. It occurs when energy is added to a solid such as dry ice. Click image to the left or use the URL below. URL: Q: Alyssas mom put some mothballs in her closet in the spring to keep moths away from her wool clothes. By autumn, the mothballs were much smaller. What happened to them? A: Mothballs are made of naphthalene, a substance that undergoes sublimation at room temperature. The solid mothballs slowly changed to a gas during the summer months, explaining why they were much smaller by autumn.

sublimation of snow and ice

Snow and ice may also undergo sublimation under certain conditions. This is most likely to happen where there is intense sunlight, very cold temperatures, and dry winds. These conditions are often found on mountain peaks. As snow sublimates, it gradually shrinks without any runoff of liquid water. Click image to the left or use the URL below. URL:

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questions

sublimation is an example of a change of state.

-->  a. true

b. false

which of the following substances changes directly from a solid to a gas at room temperature?

-->  a) naphthalene

b) water ice

c) snow

d) two of the above

what conditions are needed for snow to undergo sublimation?

a) intense sunlight

b) very cold temperatures

c) dry winds

-->  d) all of the above

solid air fresheners gradually shrink because they undergo sublimation.

-->  a. true

b. false

whenever water ice gains heat, it undergoes sublimation.

a. true

-->  b. false

after a substance sublimates, its particles have less energy.

a. true

-->  b. false

diagram questions

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