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33 Cards in this Set
- Front
- Back
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atoms
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the smallest particle of an element
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electron
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a tiny negativly charged particle that moves around the nucleus of an atom
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neutron
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a small particle in the nucleus of an atom with no electrical charge`
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proton
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a small postively charged atom in the nucleus of a substance
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mass
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a measure of how much matter is in an object
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matter
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anything that has mass and occupies space
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weight
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a measure of the force of gravity on an object
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gravity
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the force that causes two masses to accelerate towards eachother
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gravity is the force that...
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causes all things near earth to accelerate towars the center of the earth
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volume
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the amount of space that matter fills
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volume is measured in...
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cm, milliters, and liters
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Density Formula=
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mass divided by volume
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Density
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relates the mass and volume of an object or material
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density is measured in
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g/cm3
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element
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pure substances that cannot be broken down into anyother substances by physical or chemical means
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examples of elements:
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sodium, gold, silver, oxygen, hydrogen
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compound
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a substance made of two or more elements that are chemically combined
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mixture (and ex)
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two or more substances in the same places but not chemically combined
ex: sea water |
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solution (and ex)
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the best mixed of all possible mixtures
ex: sugar water |
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charachteristic properties
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properties that hold true for a cartain substance
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physical changes
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alter the form of the substance but not its identity
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chemical changes
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substances combine or brak apart to form new substances.
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thermal enegy
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energy from the movement of its particles
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temperature
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a measure of the average energy of motion of the particles of a substance
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solid
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an object with a definite volume and a definite shape
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crystalline solids
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solids that are made up of crystals
ex: snow, sugar |
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anamophous solids
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when particles are not arranged in a regular pattern
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liquid
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has no shape of its own and take son the shape of its container
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gas
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gas particles spread apart taking up the space available to them
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fluid
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a substance that flows
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viscosity
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the resistance of a liquid to flowing
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melting
melting point of water? |
the change in state from a solide to a liquid
0 degrees c |
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freezing
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the change in state from a liquid to a solid
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