15 terms

Science UNIT 2 LESSON 1

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physical change
Altering the form or organization of an object without changing the type of matter within it is called a _____.
solid; liquid; gas
3 states of matter:
physical
The state of matter of an object is a _____ property.
temperature
The average movement of molecules in an object is measured by _____.
liquid
When a solid gains heat energy, its molecules begin vibrating too quickly to stay together, so the solid becomes a _____.
condense
When gases lose heat, they _____ into liquids.
freezes
A liquid loses heat and _____ into a solid.
sublimates
When a solid changes directly into a gas, it _____.
Sun
Energy from the _____ can cause the different forms of water on Earth to change state in the water cycle.
heat energy
When a substance melts or boils, it absorbs _____.
melting point
The temperature at which a substance changes from a solid to a liquid is its _____.
boiling point
The temperature at which a substance boils is its _____.
freezing point
The temperature at which a substance changes from a liquid to a solid is its _____.
evaporation
The slow change from a liquid to a gas at temperatures below the boiling point is called _____.
When liquid water is heated to 100 degrees Celsius, it boils & changes into a gas. If the gas is cooled, it condenses & becomes a liquid. If the liquid is cooled to 0 degrees Celsius, it freezes & becomes a solid. If ice is heated, it melts to become water or sublimates to become a gas. Liquid water expands when heated & when it turns into ice.
How does water change when heat is added or removed?
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