Science Test

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Last updated 4:20 AM on 9/29/22
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26 Terms

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Substance
type of matter with a fixed composition that can’t be separated by physical means
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Element
substance made up of atoms with same identity
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Mixture
materials made of two or more substances that can be separated by physical means
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Homogeneous Mixture
mixture where 2 or more substances uniformly spread throughout
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Heterogeneous Mixture
mixture where different materials can be easily distinguished
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Physical Properties
characteristic of a material that you can observe without changing the substance
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Chemical Properties
Characteristic of a substance that indicates whether it can undergo a certain chemical change
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Physical Change
A change in size, shape, or state of matter; substance DOES NOT change identity when it undergoes physical change
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Chemical Change
A change in one substance to another substance
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Solid
Definite shape and definite volume
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Liquid
Indefinite shape and definite volume
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Gas
Indefinite shape and indefinite volume
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Solid molecules
Closely packed in geometric arrangement
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Liquid molecules
Have more space and slide past each other
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Gas molecules
Have energy to spread out evenly in container
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Heat
transfer of energy (how fast molecules moving)
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Temperature
measure of around how fast atoms are moving
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Melting
change from solid to liquid state
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Melting Point
Temperature when a solid melts
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Freezing
change from liquid to solid in state
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Freezing point
temperature of when a solid melts
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Vaporization
change from liquid to gas
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Boiling point
temperature when liquid to gas
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Evaporation
only happens on surface of liquid
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Buoyancy
the ability of a fluid to go upward
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Kinetic Molecular Theory (short answer)

All matter is composed of particles
Particles are in constant random motion
Particles collide with each other and walls of their container

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