Law of Conservation of Mass Mass is neither created nor destroyed in a chemical reaction (it just changes form) – Burning of a candle
Law of Definite Proportion A given compound always contains exactly the same proportion of elements by mass – H 2 O
Dalton’s Atomic Theory Each element is made up of tiny particles called atoms The atoms of a given element are identical; the atoms of different elements are different in some fundamental way Chemical compounds are formed when atoms of different elements combine with each other. Chemical reactions involve reorganization of the atoms (different bonding) but the atoms are not changed.
Naming Ionic Compounds From Formula to Name Metal + Non-metal OR Metal + Polyatomic 1 st Name the cation. – If the cation is a transition metal its charge must be written in ( )’s. 2 nd Name the anion and change its ending to -ide OR Write full name of the polyatomic anion
Naming Ionic Compounds From Name to Formula Metal + Non-metal OR Metal + Polyatomic 1 st Write the symbol for the cation and its charge. 2 nd Write the symbol for the anion and its charge 3 rd Circle the charges and “cross” them to balance charges.
Practice Gallium Bromide Manganese (IV) Oxide Lead (II) Chloride Calcium hydroxide
Homework Wednesday We Will Discuss Naming Covalent Compounds and Naming Acids Work on your journal article Read pages 54 – 70 Start on Homework #2 (page 72- 80) 5, 12, 23, 24, 36, 42, 50, 56, 58, 64, 68, 72, 74, 76, 78, 80, 84, 86, 90, 94, 96, 98, 112, 120