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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?
MatterLesson 2:
Changes in State
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
• 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
Changes in State
liquid
solid gas
mel
ting
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
Changes in State
liquid
solid gas
mel
ting
vaporization
condensation
Changes in State
liquid
solid gas
mel
ting
vaporization
condensation
freez
ing
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
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?
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