What type of bonds do the compounds below possess? Type: 2 Science Scoop What type of bonds do the compounds below possess? Compound A Crystalline solid Melting point 800ºC When melted or placed in water it conducts electricity Dissolves in water (a polar liquid) Compound B Gas at room temperature Melting point 23ºC Does not conduct electricity in any state Does not dissolve in water (a polar liquid)

Naming Covalent Compounds

Writing Covalent Compounds Made of two nonmetals Identify the less electronegative element 1st (one farthest left & farthest down on Periodic Table) The 1st nonmetal is just given the name as found on the Periodic Table (just like ionic) The 2nd nonmetal ending is changed to –ide (just like ionic…don’t change polyatomics) Differences = numerical prefixes are used to express how many of each nonmetal are present And no criss-crossing!

Covalent Bonding Using Lewis Dots In covalent bonding, pairs of electrons are shared F + F H + Cl C + O

Writing Covalent Compounds (cont.) You never use “criss-cross” method The only time you do not use a prefix is when there is only one of the first nonmetal. Number Prefix 1 Mono 2 Di 3 Tri 4 Tetra 5 Penta 6 Hexa 7 Hepta 8 Octa 9 Nona 10 Deca

Covalent Compound Practice SO2 N2O NO2 CCl4 Cl2O7 PCl3 SF6 Si3N4 N(BrO3)5 H2O Sulfur Dioxide Dinitrogen Monoxide Nitrogen Dioxide Carbon Tetrachloride Dichlorine Heptaoxide Phosphorus Trichloride Sulfur Hexaflouride Trisilicon Tetranitride Nitrogen Pentabromate Dihydrogen Monoxide

Covalent Compound Practice Phosphorus Trioxide Dinitrogen Pentacarbide Tellurium Noniodide Carbon Monoxide Selenium Heptafluoride Tetraphosphorous Decoxide Arsenic Hexabromide Silicon Dichloride PO3 N2C5 TeI9 CO SeF7 P4O10 AsBr6 SiCl2