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21 Cards in this Set
- Front
- Back
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Scientific method steps |
Make observation, form hypothesis, do experiment, modify hypothesis if needed, make sure experiment can be repeated under same conditions, make it a theory |
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Hypothesis |
Educated guess at a possible solution |
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Theory |
Model or concept that can be used to explain how and why systems behave as they do key explanation |
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Law |
Statement or behavior, doesn't explain how or why |
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Solid |
Definite shape and volume, particles cling rigidily to one another |
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Liquid |
Definite shape but not volume, so I particles stick firmly but not rigidily |
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Gas |
Infinite volume but no fixed shape, I particles move independently |
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Atom |
Smallest particle that represents an element |
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Molecule |
Smallest unit of a pure substance that can still exist and still retain physical and chemical properties |
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Glass is... |
Amorphous |
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Sodium chloride is a... |
Crystalline solid |
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Pure substance |
Has a definite and constant composition, regardless of source, always has the same properties under a certain set of conditions |
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Mixtures |
Combos of 2 or more pure substances in which each substance retains its own identity |
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Elements and compounds are both... |
Pure substances |
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CO2 is a pure substance but also a... |
Compound |
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Oxygen is a pure substance but also a... |
Element |
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Examples of mixtures... |
NaCl and H2O, and sucrose and water |
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Heterogeneous mixture |
Consists of physically distinct parts with different properties, not the same throughout, components remain visible and separate |
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Homogeneous mixture |
Mixture that is uniform in its properties throughout, has definite composition, but variable properties |
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Bromine and mercury are both.... |
Liquids |
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Iodine sublimation |
Iodine that goes from a solid at room temperature to a gas once heated |
