Aim How do chemists distinguish between ionic covalent

Aim: How do chemists distinguish between ionic, covalent, and metallic bonding? • Two major categories of compounds are ionic and molecular (covalent) compounds. • Metals tend to react with nonmetals to form ionic compounds. • Nonmetals tend to react with other nonmetals to form molecular (covalent) compounds. • Ionic compounds containing polyatomic ions have both ionic and covalent bonding.

Aim: How do chemists distinguish between ionic, covalent, and metallic bonding? • Metallic bonding

Aim: How do chemists distinguish between ionic, covalent, and metallic bonding? Essential questions: • Compare and contrast ionic and covalent bond types. • Draw Lewis structures (electron dot diagrams) for atoms, ions and compounds. • Determine the noble gas configuration an atom will achieve when bonding. • Use the electro negativity difference ( EN) to determine bond type (ionic, polar covalent, or non-polar covalent. )

Aim: How do chemists distinguish between ionic, covalent, and metallic bonding? • Regents Preparation Try #’s 1, 4, 5, and 6 Rules for drawing Lewis structures with many atoms: • Hydrogen and halogen atoms often bind to only one other atom (why? ) and are usually on the outside or end of molecule. • The atom with the lowest electronegativity is often the central atom. • When placing valence electrons around an atom, place one electron on each side before pairing any electrons.

Aim: How do chemists distinguish between ionic, covalent, and metallic bonding? How to name covalent compounds? Use prefixes to note the number of each type of atom: mono-, di-, tri-, tetra-, penta-, hexa-, hepta-, octa-, nona-, deca-

Aim: How do chemists distinguish between ionic, covalent, and metallic bonding • VSEPR (valence shell electron pair repulsion) theory- a model that can be used to predict shape of a molecule based on repulsion of both bonding and nonbonding electron pairs. Using this theory explain why carbon dioxide has a linear shape while sulfur dioxide is bent.

Aim: How do chemists distinguish between ionic, covalent, and metallic bonding? • Describe the properties of ionic compounds, molecular substances, and metallic solids. • Why do ionic compounds generally have higher melting and boiling points than molecular substances? • Why are metals (with metallic bonds) good conductors of heat and electricity? • Ionic compounds do not conduct electricity in the solid phase but do conduct electricity in the liquid phase or when dissolved. Explain.