Molecular Compounds and Covalent Bonds SNC2D. Terms to Know A covalent bond is formed when elements share electrons to make a bond. A molecular compound.

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Presentation transcript:

Molecular Compounds and Covalent Bonds SNC2D

Terms to Know A covalent bond is formed when elements share electrons to make a bond. A molecular compound is formed from covalent bonding atoms Typically form between two non-metals

H How Covalent Bonds Form C HHH

Formulas for Molecular Compounds 1.Write symbols with the non-metal that is further on the left of periodic table first (it will be acting as the cation), and then the one on the right second (it will be acting as the anion) 2.Write the combining capacity for each element over the symbol 3.Use “cross over” method and reduce numbers to lowest ratio C Cl 41 CCl 4 Naming molecular compounds can be tricky. There will be exceptions to the rule, such as hydrogen peroxide H 2 O 2

Naming Molecular Compounds Cation first, anion second Change ending of anion to “ide” Use prefixes to identify the number of atoms –mono, di, tri, tetra, etc. –Don’t use mono for a cation –The "o" or "a" ending of the prefix is omitted if the cation or anion name starts with an "o" or "a“ (incorrect  monooxide) CCl 4 carbon tetrachloride

More Examples nitrogen monoxideNO silicon dioxideSiO 2 carbon monoxideCO sulfur trioxideSO 3 phosphorus pentabromide PBr 5 dinitrogen trioxideN2O3N2O3

Diatomic Gases HOFBrINCl –Hydrogen (H 2 ) –Oxygen (O 2 ) –Fluorine (F 2 ) –Bromine (Br 2 ) –Iodine (I 2 ) –Nitrogen (N 2 ) –Chlorine (Cl 2 )

Try These 1.For each of the following compounds, classify the elements has metal or non-metal, classify the compound as ionic or molecular, and name the compound: [K] a)NI 3 b) PbO 2 c) AlCl 3 d) N 2 O 3 e) N 2 Of) SnO 2 g) KClO 3 2. Write the chemical formula for each of the following molecular compounds: [K] a) carbon monoxideb) carbon disulfide c) sulfur tetrafluorided) dinitrogen tetroxide 3. Hydrogen peroxide, H 2 O 2, is a molecular compound used to disinfect cuts. Why is the formula of this compound not written as HO? [A] Complete all nomenclature handouts for ionic and molecular compounds in preparation for the quiz.