Chem 111 Ch. 3
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| atomic mass | the mass of the atom in atomic mass units (amu)
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| atomic mass unit (amu) | a mass exactly equal to 1/12 the mass of one carbon-12 atom (the carbon isotope that has six protons and six neutrons - 12 amu provides the standard for measuring the atomic mass of other elements)
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| average atomic mass | (percent x 100)(atomic mass of element #1) + (percent x 100)(atomic mass of element #2) = average atomic mass (in amu)
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| mole (mol) | the amount of a substance that contains as many elementary entities (atoms, molecules, or other particles) as there are atoms in exactly 12 g of the carbon-12 isotope (Avogadro's number)
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| Avogadro's Number (NA) | Amedeo Avogadro - accepted value = 6.022 x 10^23
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| molar mass | the mass of 1 mole of units (such as atoms or molecules) of a substance
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| molecular mass | the sum of the atomic masses (in amu) in the molecule
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| the mass spectrometer | most direct and accurate method for determining atomic and molecular masses - pg. 67
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| percent composition | the percent by mass of each element in a compound = [ (n x molar mass of element) / molar mass of compound ] x 100%
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| calculating an empirical formula of a compound from its percent composition | mass percent --> moles of each element --> mole ratios of elements --> empirical formulas
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| chemical reaction | a process in which a substance (or substances) is changed into one or more new substances
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| chemical equation | uses chemical symbols to show what happens during a chemical reaction
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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