Topic 4: Expansion and Contraction
Expanding solids lab: page 212
Hot Stuff?: page 219
Dates to Remember
Sept 27: Expansion Lab due.
Sept 28: Mixing hot and cold water lab due.
Oct. 1: Topic 3 and 4 Quiz
Oct 2: Ice to water lab
Oct 10: Story
Oct 11: Topic 5 Review
Oct 17: Topic 5 Quiz
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Melting is the change from a solid to a liquid.
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Vaporization is the change from a liquid to a gas. Slow vaporization is called evaporation.
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Fast vaporization is called boiling.
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Condensation is the change from a gas to a liquid.
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Solidification, or freezing, is the change from a liquid to a solid.
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Sublimation is either the change from a solid directly to a gas, or the change from a gas to a solid. Notice that sublimation is the name for two possible changes of state.
Heat capacity is the amount of thermal energy that warms or cools the object by one degree Celcius. It describes a particular object and depends on the mass of the object and the material the object is made of.
Specific heat capacity is the amount of thermal energy that warms or cools one gram of a material by one degree Celcius. It describes a particular material and depends on what the object is made of.
Low specific heat capacity results in an energy transfer that causes a large, rapid temperature change e.g. sand on a beach
High specific heat capacity results in an energy transfer that causes a small, low temperature change e.g. water in a lake.
A graph of a change of state
is called a heating curve. The flat part of the
curve, where the substance is melting or boiling, is called a plateau.