5.4 – NOTES Ionic Compounds and Ions

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Presentation transcript:

5.4 – NOTES Ionic Compounds and Ions

Ionic compounds: substances composed of positive and negative ions Ions: electrically charged atoms or groups of atoms

Sodium atom Sodium ion 11 protons +11 11 protons 11 electrons -11 10 electrons -10 X 0 charge +1 charge, Na+

Chlorine atom Chlorine ion 17 protons +17 17 protons 17 electrons -17 18 electrons -18 0 charge -1 charge, Cl-

Ionic compounds are neutral, because positive and negative charges offset each other Crystal: the 3D network of positive and negative charges Anion: negatively charged ion Cation: positively charged ion “cations are pawsitive” Formula Unit: the simplest unit of an ionic compound

Ionic compounds dissolve in water because water has regions with partial positive and partial negative charges. Draw!

Hexane (C6H14) does not contain positive or negative regions, therefore it cannot dissolve ionic compounds. But it will dissolve the halogens (Cl2, Br2 and I2) because they also do not contain positive and negative regions. Like dissolves like!