Chapter 2.2: Physical Properties – Flashcards
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Viscosity
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A liquid's resistance to flow
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Malleability
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The ability of a solid to be hammered without shattering
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Melting point
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The temperature which a solid becomes liquid (0 degrees Celsius).
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A physical property is any characteristic of a material that can be observed or measured without changing the _____ of the substances in the material
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composition
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Why is a wooden spoon a better choice that a metal spoon for stirring a boiling pot of soup?
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Metal is a better conductor of heat so the heat in the metal would travel faster and burn your hand on its end.
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True or false: A liquid with a low viscosity will flow more slowly than a liquid with a high viscosity at the same temperature
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false, a liquid with a HIGH viscosity will flow more slowly than a liquid with a LOW viscosity at the same temperature
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True or False: Discovering which of two materials can scratch the other is a way to compare the hardness of the materials
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true
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conductivity
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The ability to allow heat to flow
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boiling point
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The temperature at which a substance changes from a liquid to a gas (100 degrees Celsius).
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density
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The ratio of the mass of a substance to its volume
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What are the 3 steps used to identify a material
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(1.) Decide which property to test (2.) Do tests on a sample of the unknown (3.) compare the results with the data reported for known materials
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True or False: Usually, people consider only one property when choosing a material
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false, usually around 3-4
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Two processes that are commonly used to separate mixtures are ____ and ____
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filtration and distillation
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How does filtration separate materials based on their size?
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Particles of the compounds that dissolve are small enough to pass through the strainer but objects such as broken bits of pottery are too large to pass through the screen.
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Why does distillation work for converting seawater into fresh water
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Boiling can separate seawater from freshwater because water has a much lower boiling point than the compound dissolved in seawater
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true or false: In a physical change, some of the substances in a material change, but the properties of the materials stay the same.
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false, switch substances with properties
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why is the boiling point of water a physical change
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when you boil water it becomes a gas so the substance has changed but the properties stay the same
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List 2 examples of a physical change
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-wrinkling a shirt
-freezing water
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filtration
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a process that separates materials based on the size of their particles
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distillation
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a process that separates the substances in a solution based on their boiling points
