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25 Cards in this Set
- Front
- Back
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What does AMU stand for?
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Atomic Mass Unit.
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What is the mass of a molecule called?
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Molar mass.
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What is the formula mass of any molecule, formula unit, or ion?
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The sum of the average atomic masses of all atoms represented in its formula.
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How does one find formula mass?
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One would add all the molar masses together.
EX: K - 39.19 amu Cl - 35.45 amu O3 - 48.00 amu --------------- KClO3 - 122.55 amu |
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What is the molar mass of a substance equal to?
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The mass of grams in one mole. (6.022 x 10^23
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Finding the molar mass is the same as formula mass for compounds.
TRUE or FALSE? |
True.
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The molar mass of a compound can be used as a __________ factor to relate an amount in moles to a mass in grams for a given substance.
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conversion
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Amount in Moles x Molar Mass (g/mol) = _________.
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Mass in Grams
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Mass in Grams x 1 / molar mass (g/mol) = __________.
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Amount in Moles
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Mass of Element in Sample of Compound
________________________ Mass of Sample of Compound x 100 = ____________. |
% Element in Compound
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Mass of Element in 1 Mol of Compound
________________________________ Molar Mass of Compound x 100 = ________________. |
% Element in Compound.
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What is the percentage by mass of each element in a compound known as?
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Percentage Composition of the Compound.
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What does a empirical formula consist of?
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The symbols for the elements combined in a compound, with subscripts showing the smallest whole-number mole ratio of the different atoms in the compound.
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For an/a ______ compound, the formula unit is usually the compound's empirical formula.
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ionic
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For an/a ______ compound, the formula unit is not necessarily the compound's empirical formula.
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molecular
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How does one determine a compound's empirical formula?
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From its percentage composition, begin by converting that to a mass composition. Then, one would take the mass composition of each element and convert it to a composition in moles by dividing by the appropriate molar mass. Then divide by the smallest number between the two mole ratios. Then one can put it together from there.
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What is the formula mass of any molecule, formula unit, or ion?
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The sum of the average atomic masses of all atoms represented in its formula.
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How does one find formula mass?
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One would add all the molar masses together.
EX: K - 39.19 amu Cl - 35.45 amu O3 - 48.00 amu --------------- KClO3 - 122.55 amu |
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Amount in Moles x Molar Mass (g/mol) = _________.
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Mass in Grams
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Mass in Grams x 1 / molar mass (g/mol) = __________.
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Amount in Moles
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Mass of Element in Sample of Compound
________________________ Mass of Sample of Compound x 100 = ____________. |
% Element in Compound
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How does one determine a compound's empirical formula?
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From its percentage composition, begin by converting that to a mass composition. Then, one would take the mass composition of each element and convert it to a composition in moles by dividing by the appropriate molar mass. Then divide by the smallest number between the two mole ratios. Then one can put it together from there.
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What are the rules for assigning oxidation numbers?
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-A free element's oxidation number will always be 0.
-Pay attention to the charge. Na+ becomes +1. -H is always +1. -O is always -2. -Group one (Alkali) metals are always +1. Group two (Alkaline-earth) metals are always +2. -Halogens are always -1. -The charge is the SUM. |
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What does the extension OH mean?
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Hydroxide.
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Name the compound H2SO3.
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Sulfurous acid.
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