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IPC lesson 25 - reversible and irreversible chan ...
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When we can’t have the original matter back, we call the change _____.
irreversible.
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Condensation happens when molecules in a gas ___.
cool down
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When the original matter can be obtained back, we call the change _____.
reversible
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For matter to change, we need _____.
energy
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The heat gives the liquid’s molecules more ___.
energy
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Changes can be caused by______ matter up or ______ it down.
heating or cooling
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When we heat up matter and change it from liquid to gas, this is called _____.
evaporation
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When we cool down matter from liquid to solid, this is called _____.
solidification or freezing
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Evaporation happens when a liquid is ___.
heated
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Energy causes the molecules to move ____.
faster
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Matter can exist in three different states: ___, ___, or ___.
solid liquid gas
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As the molecules cool down, they lose energy, so they ___.
slow down
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When we cool down matter changing it from gas to liquid, this is called_____.
condensation
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This change is _____.
irreversible
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This change is _____.
reversible
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When we heat up matter from solid to liquid, this is called _____.
melting
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Okay!
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