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Related Flashcards
Cards In This Set
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What color or Hydrogen and Helium atoms?
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H: whiteHe: blue
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Sublimation pertains to..
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Solid & gas
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Chemistry
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Study of composition, structure, properties of matter and of energy consumed or given off when matter undergoes a change
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Matter
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Anything that occupies space and has mass (pure substance/Physical Process)
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Mass
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Defines the quantity of matter in an object
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Energy
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The capacity to do work
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What are the Classes of Matter? Explain.
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-Pure substance: same physical & chemical properties throughout; cannot be separated into simpler substance by physical process (Ex. atoms of Helium, molecules of carbon dioxide)-Physical Process: transformation of sample of matter (change in physical state) doesn't alter chemical...
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Pure substance consists of...
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-Element: pure substance that cannot be separated smaller by any chemical process. (Ex. Hydrogen (H), Oxygen (O))-Compound: composed of 2 or more elements bonded together (Ex. Carbon Dioxide (CO2), Water (H2O)).
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Mixture
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Combination of 2 or more pure substances; can be separated
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What are two types of mixtures?
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1)Homogeneous: components are distributed uniformly throughout sample & have no boundaries or regions; also called solution. (Ex. mix of gas)2) Heterogeneous: not distributed uniformly & may have distinct regions.
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Atom
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Smallest particle of element retains chemical characteristic of that element.
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Molecule
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Assembly of 2 or more atoms that are held together in a characteristic pattern by chemical bonds.
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Chemical Formula
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Notation for representing elements & compounds; consists of symbols of constituent elements & subscripts identify the number of atoms of each element in one molecule.
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Ammonia
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NH3
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Ethanol
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C2H6O
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