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31 Cards in this Set
- Front
- Back
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In a __________ the matters identity stays the same |
physical change |
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a physical change involves a change in size, shape, form, or ________ |
state |
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although the matters identity stays the same, its _________ might change |
physical properties |
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when food is chewed, matter undergoes a physical change in _______ and size |
shape |
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matter undergoes a physical change when it changes from one _______ to another |
state |
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a change in state involves a change in the ________ of the particles |
energy |
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the energy of particles changes when ______ energy is ______ or removed |
thermal. added |
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when thermal energy is added to particles, they move ______ and temperature _______ |
faster. increases |
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when partilcles move faster, they can overcome the _______ forces that hold them together |
attractive |
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when enough energy is added to a solid for it to change to a liquid, the solid has reached its __________ |
melting point |
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when enough energy is added to a liquid for it to change to a gas, the liquid has reached its _______ |
boiling point |
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sometimes, when energy is added to a solid, it undergoes ______, in which it changes directly from a solid to a _____ without first becoming a _______ |
sublimation. gas. liquid |
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when thermal energy is removed from particles, they move ________ and temperature ________ |
more slowly. decreases |
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when particles move slower, they are drawn closer together by ________ forces between them |
attractive |
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when enough energy is removed from a gas for it to change to a liquid, the gas ________ |
condenses |
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when enough energy is removed from a liquid for it to change to a solid, the liquid ________ |
freezes |
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if a gas changes directly to a solid without first becoming a liquid, the gas undergoes ______ |
deposition |
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melting and _________ are reverse processes as are ______ and boiling and ______ and deposition |
freezing. condensation. sublimation |
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_________ during which one substance evenly mixes with another substance it also a physical change |
dissolving |
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some types of physical changes are _________ such as when a solid changes to a liquid and then the liquid changes back into a __________ |
reversable. solid |
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the particles that are present before a physical change are also __________ after the change |
present |
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therefore, _______ also is the same before and after a physical change |
mass |
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how can you change the state of matter |
add or remove thermal energy |
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describe the movement of particles when thermal energy is added to a solid |
the particles in the solid start moving faster and farther apart |
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what is the melting point of matter |
temperature at which a solid changes to a liquid |
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boiling point of matter |
temperature at which a liquid changes to a gas |
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what is sublimation |
when a solid changes directly to a gas without first becoming a liquid |
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describe them movement of particles when thermal energy is removed from a gas |
they start moving slower which is decreasing the temperature and eventually it will turn back into a liquid and then a solid |
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what is condensation |
it is the process that occurs when a gas becomes a liquid |
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what is freezing |
when a liquid changes to a solid |
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what is deposition |
when a gas changes directly to a solid |
