Properties of Ionic and Covalent Compounds

Properties of Ionic and Covalent Compounds

Properties of Ionic and Covalent Compounds Section 4.3 Pages 94-95 Physical State Ionic solid at room temperature due to rigid 3D structure Covalent state varies at room

temperature (sugar, ethanol, carbon dioxide) Melting and Boiling Points Melting point temp. at which solid is converted to liquid Boiling point temp. at which liquid is converted to gas at specific pressure

It takes large amounts of energy to break apart ionic crystal lattice. Melting and Boiling Points Ionic compounds generally have higher melting and boiling points as compared to covalent compounds. Melting Point Example:

NaCl 801C methane -182 C Structure of Compounds in Solid State Ionic crystalline (regular repeating structure) Table salt

Covalent crystalline or amorphous (no regular structure) Sugar, graphite Solutions Ionic solids dissolve in water. Ionic solutions are electrolytes can carry electrical current Nonpolar covalent solids do not

dissolve in water. Polar covalent solids can dissolve in water and are weak electrolytes.

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