# chapter 7

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1. can also be used to determine the number of atoms present in a specific mass of an element
atomic mass
2. mass of a single atom of that element
atomic mass written under the symbol on the periodic table
3. sum of the atomic masses of all the atoms in its formula
formula mass
4. particles such as atoms, molecules, and ions are counted by the
mole
5. the unit of mole contains
6.022X10 to the 23 power items
6. the number of items in a mole, equal to 6.022X10 23 power
7. a group of atoms, molecules, or formula units that contain 6.022X10 23 power of items
mole
8. group of ions given by the formula of an ionic compound
formula units
9. quanitity in grams that equals the atomic mass of that element
molar mass
10. to determine the molar mass of a compound
muliply the molar mass of each element by its subscript in the formula and add the results
11. used to change from moles of a substance to grams or from grams to moles
molar mass
12. mass percent of each element present
percent composition
13. the actural or true formulas of compounds
molecular formulas
14. formula that represents the lowest whole-number ration of the atoms in a compound
empirical formula
15. the percent by mass of the elements in a formula
percent composition
16. atom which forms the most bonds
central atom
17. - (dash)=
2 dots or 2 electrons
18. the ability of an atom to attract valence electrons
electronegativity
19. electronegativity of 0.5-1.7
polar
20. electronegativity of 0-0.4
nonpolar
21. electronegativity = to or greater than 1.8
ionic
22. nonsymetrical
polar
23. symtetrical
nonpolar
24. sum of atomic mass (weight) of all atoms in its formula
formula mass
decimal places
26. round multiplication and division answers to lowest number of
sig figs
27. a unit that contains 6.022X10 to the 23 power number of items or particles (atom,moleculs, ions)
mole
28. given particles------find number of moles
divide
29. given moles-------------find number of particle
multiply
30. contain two atoms
diatomic element
31. list the diatomic elements
• Hydrogen
• Nitrogen
• Oxygen
• Fluorine
• Chlorine
• Bromine
• Iodine
 Author: phut52 ID: 202157 Card Set: chapter 7 Updated: 2013-03-05 21:38:28 Tags: phut5252 Folders: Description: chapter 7 chem Show Answers: