properties and changes in matter chapter 20 glencoe science
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Properties and Changes in Matter
Chapter 20 Glencoe Science
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Physical PropertyPhysical Property
A characteristic that you can observe without changing or trying to change the composition of the substance.
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Physical PropertyPhysical Property
How something looks, smells, sounds, or tastes are all examples of physical properties.
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Physical PropertiesPhysical Properties
You can detect many physical properties with your senses.
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Mass Mass
Mass is a measurement of how much matter an object contains.
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WeightWeightWeight is a measurement of
force.Weight depends on the mass
of the object and on gravity.No matter where you are in
the universe your mass never changes, but your weight can.
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DensityDensity
Density measures the amount of mass in a given volume.
Density = mass/volume
D=m/v
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SolubilitySolubility
Solubility is the ability of one substance to dissolve into another substance.
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Melting PointMelting Point
The temperature at which a solid changes into a liquid is called its melting point.
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Boiling PointBoiling Point
The temperature at which a liquid changes into a gas is called its boiling point.
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MagnetismMagnetism
Magnetism is a physical property.
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Chemical PropertyChemical Property
A chemical property is a characteristic that cannot be observed without altering the substance.
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Chemical PropertiesChemical Properties
Examples of chemical properties:
Flammability, rusting, reacting with substances like acids
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Physical ChangesPhysical Changes
A physical change is one in which the form or appearance of matter changes, but not its composition.
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Changing StateChanging State
Vaporization is the process by which matter changes from a liquid state to a gas.
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Changing StateChanging State
Condensation is the process where a gas changes into a liquid.
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Changing StateChanging State
Sublimation is the process in which a solid changes directly into a gas.
Ex: dry ice
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Changing StateChanging State
Deposition is the process in which a gas changes into a solid.
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Chemical ChangesChemical Changes
Chemical changes occur when substances are changed into different substances.
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Clues to Chemical Clues to Chemical ChangesChanges
Color change is an example of a chemical change.
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Clues to Chemical Clues to Chemical ChangesChanges
Another sign of a chemical change is the release or gain of energy by an object.
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Clues to Chemical Clues to Chemical ChangesChanges
The change in odor is a clue to a chemical change.
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Signs of Chemical Signs of Chemical ChangesChanges
The production of bubbles is a sign that a chemical change has taken place.
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Clues to Chemical Clues to Chemical ChangesChanges
Another clue to a chemical change is the formation of a solid.
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Chemical ChangesChemical Changes
The substances produced during a chemical change cannot be changed back into the original substances by physical means.
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Chemical vs. PhysicalChemical vs. Physical During a physical change the composition of
the substance does not change, but during a chemical change the composition of the substance does change.
Chemical change
Physical change
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Conservation of MassConservation of Mass
Law of conservation of mass states that mass is neither created nor destroyed. As a result the mass of the substances before a physical or chemical change is equal to the mass of the substances present after the change.
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Chemical vs. PhysicalChemical vs. Physical Chemical and Physical Changes Game