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16 Cards in this Set
- Front
- Back
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periodic table |
chart that lists elements by their properties, lists atomic number |
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molecule |
made up of atoms |
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atom
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smallest particle into which an element can be divided and still be that element, made of protons, neutrons, and electrons |
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nucleus |
center of an atom, contains protons and neutrons, has most of the mass of the atom |
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matter |
anything that takes up space and has mass, except energy, phases of matter are solids, liquids, gases, and plasma |
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mass
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the amount of matter in an object; measured in grams (g) on a triple beam balance |
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density
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the amount of matter packed into a given volume of space, formula is D=mass/volume; labeled g/cm3 or g/mL |
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density of water |
1 g/ml |
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states (phases)of matter |
depends on how fast the molecules move |
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solids
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definite shape & definite volume; molecules are packed together so they can’t move far or fast |
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liqiuds
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no definite shape, definite volume, molecules are still close together but not as close as in solids, molecules are free to move in a rapid, random motion |
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gases |
no definite shape, no definite volume, molecules spread out from each other and move verrrrrry fast in a random way |
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heat
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makes molecules move faster |
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cold/cooling
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makes them slow down |
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physical change
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size, shape, or state of matter changes, can be created by motion, temperature, and pressure |
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chemical change |
occurs when molecules actually change, cannot usually be reversed indicators for chemical change - 1) new odor/color 2) gas forms 3) heat or light appears 4) solid (precipitate) is formed |
