90 likes | 272 Views
Warm-up: 10/21. Using the reference sheet with the list of polyatomic ions- pg. 12, answer the following: 1. Write out the chemical formulas for: a. hydroxide c. sulfite b. phosphate d. sulfate 2. What is the charge for each of the above polyatomics ?.
E N D
Warm-up: 10/21 Using the reference sheet with the list of polyatomic ions- pg. 12, answer the following: 1. Write out the chemical formulas for: a. hydroxide c. sulfite b. phosphate d. sulfate 2. What is the charge for each of the above polyatomics?
NOTES #4: Polyatomic Ions • Polyatomic ions – more than one atom held together covalently that act as a single atom. All polyatomic ions have a charge, that’s why they’re called IONS.
NOTES #4: Polyatomic Ions • When naming, write the metal name first, unchanged with any appropriate Roman Numeral (for multivalent cations). Then write the name of the polyatomic from the reference list. i.e. NaClO3 = Sodium chlorate Na+ ClO3-
NOTES #4: Polyatomic Ions • NEVER change name or look of polyatomic. If you change the subscripts for any part of the polyatomic, then it is no longer that same polyatomic ion. i.e. NaClO3 = Sodium chlorate ≠ NaCl2O3 Na+ ClO3-
NOTES #4: Polyatomic Ions • Use crisscross rule when writing formula. • When using the crisscross rule to determine the chemical formula, use parenthesis ( ) and place number as subscript outside of parenthesis ONLY if there is more than one of that polyatomic. i.e. Calcium chlorate = Ca(ClO3)2≠ CaClO6 Ca2+ ClO3-
NOTES #4: Polyatomic Ions • Homework: Finish p.13