Ch. 2 Molecules & Chemical Bonds
Types of Chemical Bonds
-Ionic Bonds -Covalent Bonds -Hydrogen Bonds -Van der Waals forces
Covalent Bonds
-Sharing of electrons -exist as neutral molecules -relatively weak force of attraction between molecules -remain as same molecule in water and will not conduct electricity
Molecular formula
identifies constituent elements and how many atoms of each are present
Compounds
molecules composed of two or more different elements
Isomers
molecules with identical molecular formulae but different arrangement of their atoms
Ionic Bonds
-Transfer of Electrons -Contains positive and negative ions -Strong force of attraction between particles -Separates into charged particles in water to give a solution that conducts electricity
Single covalent bond
one pair of electrons are shared
Molecules
chemical particles composed of two or more atoms united by a chemical bond
Chemical bonds
forces that hold molecules together, or attract one molecule to another
Hydrogen Bond
-a weak attraction between a slightly positive hydrogen atom in one molecule and a slightly negative oxygen or nitrogen atom in another -relatively weak bonds -very important to physiology(protein structure/DNA structure)
Structural Formula
Location of each atom Structural isomers revealed
Nonpolar and polar covalent bonds
the strongest of all chemical bonds
Double covalent bonds
two pairs of electrons are shared
