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9 Cards in this Set
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- Back
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Why do chemists use the mole as a counting unit for atoms?
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Atoms are too small to count individually.
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Define a mole.
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The SI base unit that describes the amount of a substance.
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What is Avagadro's constant?
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the number of particles in 1 mol; equals 6.022 x 10 /mol
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Define molar mass.
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the mass in grams of 1 mol of a substance
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What is the relationship between the molar mass of an element in grams and its average atomic mass in amu?
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they are the same number
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What is the molar mass of magnesium?
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24.31 g/mol
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What is a conversion factor?
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a ratio equal to one that expresses the same quantity in two different ways
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Why is multiplying a conversion factor like multiplying by one?
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because both parts of the conversion factor are always equal
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What can you say about the relationship between the amount of an element and its mass?
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there is a direct relationship
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