Chemical Bonds Force of attraction between two atoms

Ionic Bonds Occur in ionic compounds generally between a metal and a nonmetal Formed when electrons are transferred Strong bond High melting point Generally solids Poor conductors of electricity as a solid, but good conductors when dissolved

Covalent Bonds Generally occur in molecular compounds between two nonmetals Formed when electrons are shared Weak bonds Low melting points Usually liquids or gases Poor conductors of electricity

Which of the following compounds contains ionic bonds? NaCl NO F2 SO3 Answer Now

Sharing in covalent bonds Electronegativity determines how electrons are shared Uneven sharing = polar bond Even sharing = nonpolar bond

Metallic Bonds Occur between atoms of a metal of the same element. Strong bonds Have all of the properties of metals discussed with the periodic table

Lewis Structures (Dot Diagrams) Used to show the arrangement of atoms in molecules or ions Follow the next steps to draw Lewis structures

Steps for drawing Lewis structures Count the number of valence electrons in the molecule or ion Arrange the atoms around a central atom Put a pair of electrons (2 dots) where each bond occurs Put the remaining electrons around each atom so all have 8 except hydrogen which can only have 2

Molecular Shapes

Molecular Structure Worksheet Molecules Carbon tetrabromide Phosphorus trichloride Hydrogen sulfide Chlorine molecule (Cl2) Sulfur dichloride Carbon monoxide Ethane (C2H6) Silicon dioxide Hydrogen cyanide Chlorine trifluoride

What happens when oil is put in water? Like Dissolves Like

Cell Membranes

Hydrogen Bonds Bond that occurs between molecules containing hydrogen and an atom with a high electronegativity (usually N, O, F, Cl, or S)