(2.2) IONIC COMPOUNDS (p128-129) NAMES & FORMULAS.

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Presentation transcript:

(2.2) IONIC COMPOUNDS (p128-129) NAMES & FORMULAS

Compounds Recall: There are two main types of compounds: IONIC and MOLECULAR NaCl, K2SO4 H2O, C6H12O6

Ionic Compounds Ionic compounds are formed by combining a metal and a non-metal. The positive ion (from the metal) and negative ion (from the non-metal) bond to each other.

Ion Symbols and Names The symbol for an ion is the element symbol with a superscript showing the ionic charge Metals: The name does not change from the element name unless the element is multivalent (can form different ions). Na1+ Ca2+ Cu1+ Cu2+ sodium calcium copper I copper II

Ion Symbols and Names Non-Metals: The name changes its ending to “ide” Cl1- O2- S2- chloride oxide sulfide

Naming Ionic Compounds An ionic compound has a two-part name: first second Metal ion Non-metal ion Positive ion Negative ion Keeps its name Changes ending to “ide”

Naming Ionic Compounds-Practice a) sodium & chlorine b) potassium & oxygen

Formulas for Ionic Compounds What is the chemical formula for the ionic compound formed by magnesium and oxygen? STEP ONE: Write the symbol for each element.

Formulas for Ionic Compounds STEP TWO: add the ionic charges of each

Formulas for Ionic Compounds STEP THREE: Criss-cross the charges

Formulas for Ionic Compounds STEP FOUR: Write the formula using subscripts. STEP FIVE: Simplify or reduce the ratio, if possible

Formulas for Ionic Compounds Try these: aluminium and oxygen potassium and nitrogen copper I and sulfur

Answers: Al2O3 K3N Cu2S

“Weirdos” Multivalent elements can form ions more than one way There has to be a method of identifying which valence (charge) is used Pb, Fe, Cu, Sn, Co to name a few.

Multivalent elements Pb2+ 4+ on the periodic table means lead II (Pb2+) or lead IV (Pb4+) Fe2+ 3+  iron II or iron III Cu1+ 2+  copper I or copper II Sn2+ 4+  tin II or tin IV

WEIRDOS CuCl  CuCl2  Fe2O3 

HOMEWORK Worksheet 2.2 (A) compound naming - both sides!