changes in state - chesapeake academy · 2020. 3. 23. · changes in state • changing the thermal...
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Bell Work1. What happens to the particles in a liquid as a liquid
turns into a solid?
2. What are the differences between a liquid and a gas?
3. Which states of matter have a definite shape? Which have a definite volume? Which have a definite mass?
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MatterLesson 2:
Changes in State
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Changes in State• changing the thermal energy of a substance results in
changing the kinetic energy of its particles
• if KE changes enough, the state of matter will change
• increasing thermal energy, increases kinetic energy
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• decreasing thermal energy, decreases kinetic energy• increasing thermal energy, increases kinetic energy
Changes in State• changing the thermal energy of a substance results in
changing the kinetic energy of its particles
• if KE changes enough, the state of matter will change
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Changes in State
liquid
solid gas
mel
ting
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Changes in State
liquid
solid gas
mel
ting
vaporization
• two types:
• evaporation: vaporization only at the surface of a liquid
• boiling: vaporization below and at the surface of a liquid
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Changes in State
liquid
solid gas
mel
ting
vaporization
condensation
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Changes in State
liquid
solid gas
mel
ting
vaporization
condensation
freez
ing
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Changes in State
liquid
solid gas
mel
ting
vaporization
condensation
freez
ing
sublimation
• sublimation happens when something that is normally a gas is frozen into a solid
• the difference between its freezing point and the current temp. is so great that it instantly turns to gas
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Practice1. Why is changing the state of matter considered a
physical change instead of a chemical change?
2. How does thermal energy affect the kinetic energy of the particles within a substance?
3. How does kinetic energy determine state of matter?
4. Starting from a solid, what changes occur as thermal energy is increased?
5. What happens to particles as a substance condenses?
6. What is vaporization, and how are its types different?
7. What is sublimation, and what causes it to happen?